Subject: Re: [Healeys] radiator thermostat

From: Richard Mayor <[email-masked]>
Date: Wed, 17 Sep 2025 12:54:35 -0700

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">165 is too cold for good running. &nbsp;Our=
 engines run better in the 180 to 190 range. &nbsp;<div>&nbsp;</div><div><br=
><div><div dir=3D"ltr">Sent from my iPad</div><div dir=3D"ltr"><br><blockquo=
te type=3D"cite">On Sep 17, 2025, at 12:13=E2=80=AFPM, Robert Markovich via H=
ealeys &lt;[email-masked]&gt; wrote:<br><br></blockquote></div><bloc=
kquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<!--[if gte mso 9]><xml><o:Of=
ficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:O=
fficeDocumentSettings></xml><![endif]-->
165 is the one I use<br><br><br><div class=3D"yahoo-signature"><a style=3D"f=
ont-size:12px" href=3D"https://aolapp.onelink.me/eG2g?pid=3DNativePlacement&=
amp;c=3DUS_Acquisition_YMktg_320_EmailSignature_AttributionDL&amp;af_sub1=3D=
Acquisition&amp;af_sub2=3DUS_YMktg&amp;af_sub3=3D&amp;af_sub4=3D100002473&am=
p;af_sub5=3DSentFromNewAOLApp__Interstitial_&amp;af_ios_store_cpp=3Dce85ce34=
-ad0f-4811-a92b-a172743b064e&amp;af_android_url=3Dhttps%3A%2F%2Fplay.google.=
com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Demail_=
signature_attribution">Sent from the all new AOL app for iOS</a><br></div><b=
r><p class=3D"yahoo-quoted-begin" style=3D"font-size: 15px; color: rgb(132, 1=
15, 255); padding-top: 15px; margin-top: 0px;">On Wednesday, September 17, 2=
025, 2:50 PM, Richard Antal via Healeys &lt;[email-masked]&gt; wrote=
:</p><blockquote class=3D"iosymail"><div id=3D"yiv6324880639"><div><div styl=
e=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;" class=3D"yiv6324880639yahoo-style-wrap"><div dir=3D"ltr">Gents,</div><div=
 dir=3D"ltr">&nbsp; &nbsp; &nbsp;What is the desired coolant temperature for=
 optimal engine performance? I've searched the tech articles and can find no=
thing that specifically answers that question. This summer my BJ8 seemed to r=
un fine with a 160 thermostat which, according to the gauge which I've check=
ed and found to be accurate, kept the coolant at around 165. Thanks to all w=
ho respond.</div><div dir=3D"ltr">rich antal</div></div></div></div>________=
_______________________________________<br>Support Team.Net <a href=3D"http:=
//www.team.net/donate.html" target=3D"_blank">http://www.team.net/donate.htm=
l</a><br>Suggested annual donation&nbsp; $12.75<br><br>Archive: <a href=3D"h=
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et=3D"_blank">http://autox.team.net/archive/healeys</a><br><br><a ymailto=3D=
"mailto:[email-masked]" href=3D"mailto:[email-masked]">Heale=
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ockquote>
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_______________________________________________

Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive/healeys

[email-masked]
http://autox.team.net/mailman/listinfo/healeys

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From: Harold Manifold <[email-masked]>
Date: Wed, 17 Sep 2025 13:52:07 -0700

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Hi All,

Thermostats always generate interesting discussions.

I use a 180-degree thermostat in my car. However, what's equally important
is how effectively the thermostat regulates the coolant temperature. A
thermostat that is fully closed or fully open is no longer actively
controlling the temperature. The normal operating range is typically the
opening temperature plus 20 degrees. For example, a 165-degree thermostat
should maintain the temperature between 165 and 185 degrees, while a
180-degree thermostat should keep it between 180 and 200 degrees.

If your current thermostat maintains the coolant temperature within its
specified range under normal driving conditions, then it's the correct one
for your needs.

Harold

On Wed, Sep 17, 2025 at 1:36=E2=80=AFPM Richard Mayor <[email-masked]=
m> wrote:

> 165 is too cold for good running.  Our engines run better in the 180 to
> 190 range.
>
>
> Sent from my iPad
>
> On Sep 17, 2025, at 12:13=E2=80=AFPM, Robert Markovich via Healeys <
> [email-masked]> wrote:
>
> =EF=BB=BF 165 is the one I use
>
>
> Sent from the all new AOL app for iOS
> <https://aolapp.onelink.me/eG2g?pid=3DNativePlacement&c=3DUS_Acquisition_=
YMktg_320_EmailSignature_AttributionDL&af_sub1=3DAcquisition&af_sub2=3DUS_Y=
Mktg&af_sub3=3D&af_sub4=3D100002473&af_sub5=3DSentFromNewAOLApp__Interstiti=
al_&af_ios_store_cpp=3Dce85ce34-ad0f-4811-a92b-a172743b064e&af_android_url=
=3Dhttps%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mo=
bile.aolapp%26listing%3Demail_signature_attribution>
>
> On Wednesday, September 17, 2025, 2:50 PM, Richard Antal via Healeys <
> [email-masked]> wrote:
>
> Gents,
>      What is the desired coolant temperature for optimal engine
> performance? I've searched the tech articles and can find nothing that
> specifically answers that question. This summer my BJ8 seemed to run fine
> with a 160 thermostat which, according to the gauge which I've checked an=
d
> found to be accurate, kept the coolant at around 165. Thanks to all who
> respond.
> rich antal
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation  $12.75
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/[email-masked]
>
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation  $12.75
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/[email-masked]
>
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation  $12.75
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/[email-masked]
>
>

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<div dir=3D"ltr"><div>Hi All,</div><div><br></div><div>Thermostats always g=
enerate interesting discussions.</div><div><br></div><div>I use a 180-degre=
e thermostat in my car. However, what&#39;s equally important is how effect=
ively the thermostat regulates the coolant temperature. A thermostat that i=
s fully closed or fully open is no longer actively controlling the temperat=
ure. The normal operating range is typically the opening temperature plus 2=
0 degrees. For example, a 165-degree thermostat should maintain the tempera=
ture between 165 and 185 degrees, while a 180-degree thermostat should keep=
 it between 180 and 200 degrees.</div><div><br></div><div>If your current t=
hermostat maintains the coolant temperature within its specified range unde=
r normal driving conditions, then it&#39;s the correct one for your needs.<=
/div><div><br></div><div>Harold</div></div><br><div class=3D"gmail_quote gm=
ail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Sep 17, =
2025 at 1:36=E2=80=AFPM Richard Mayor &lt;<a href=3D"mailto:boyracer466@gma=
il.com">[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex"><div dir=3D"auto">165 is too cold for good run=
ning.=C2=A0 Our engines run better in the 180 to 190 range. =C2=A0<div>=C2=
=A0</div><div><br><div><div dir=3D"ltr">Sent from my iPad</div><div dir=3D"=
ltr"><br><blockquote type=3D"cite">On Sep 17, 2025, at 12:13=E2=80=AFPM, Ro=
bert Markovich via Healeys &lt;<a href=3D"mailto:[email-masked]" ta=
rget=3D"_blank">[email-masked]</a>&gt; wrote:<br><br></blockquote><=
/div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF
165 is the one I use<br><br><br><div><a style=3D"font-size:12px" href=3D"ht=
tps://aolapp.onelink.me/eG2g?pid=3DNativePlacement&amp;c=3DUS_Acquisition_Y=
Mktg_320_EmailSignature_AttributionDL&amp;af_sub1=3DAcquisition&amp;af_sub2=
=3DUS_YMktg&amp;af_sub3=3D&amp;af_sub4=3D100002473&amp;af_sub5=3DSentFromNe=
wAOLApp__Interstitial_&amp;af_ios_store_cpp=3Dce85ce34-ad0f-4811-a92b-a1727=
43b064e&amp;af_android_url=3Dhttps%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2=
Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Demail_signature_attributi=
on" target=3D"_blank">Sent from the all new AOL app for iOS</a><br></div><b=
r><p style=3D"font-size:15px;color:rgb(132,115,255);padding-top:15px;margin=
-top:0px">On Wednesday, September 17, 2025, 2:50 PM, Richard Antal via Heal=
eys &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">healeys=
@autox.team.net</a>&gt; wrote:</p><blockquote><div id=3D"m_3862331438548245=
316yiv6324880639"><div><div style=3D"font-family:&quot;Helvetica Neue&quot;=
,Helvetica,Arial,sans-serif;font-size:13px"><div dir=3D"ltr">Gents,</div><d=
iv dir=3D"ltr">=C2=A0 =C2=A0 =C2=A0What is the desired coolant temperature =
for optimal engine performance? I&#39;ve searched the tech articles and can=
 find nothing that specifically answers that question. This summer my BJ8 s=
eemed to run fine with a 160 thermostat which, according to the gauge which=
 I&#39;ve checked and found to be accurate, kept the coolant at around 165.=
 Thanks to all who respond.</div><div dir=3D"ltr">rich antal</div></div></d=
iv></div>_______________________________________________<br>Support Team.Ne=
t <a href=3D"http://www.team.net/donate.html" target=3D"_blank">http://www.=
team.net/donate.html</a><br>Suggested annual donation=C2=A0 $12.75<br><br>A=
rchive: <a href=3D"http://www.team.net/pipermail/healeys" target=3D"_blank"=
>http://www.team.net/pipermail/healeys</a> <a href=3D"http://autox.team.net=
/archive/healeys" target=3D"_blank">http://autox.team.net/archive/healeys</=
a><br><br><a href=3D"mailto:[email-masked]" target=3D"_blank">Heale=
[email-masked]</a><br><a href=3D"http://autox.team.net/mailman/listinfo/=
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lman/options/healeys/[email-masked]</a><br><br><blockquote></blockquote=
></blockquote>
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/div>_______________________________________________<br>
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</blockquote></div>

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[email-masked]

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From: Richard Collins via Healeys <[email-masked]>
Date: Wed, 17 Sep 2025 21:07:17 +0000

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[email-masked]

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From: "JSARCH" <[email-masked]>
Date: Wed, 17 Sep 2025 22:52:03 -0700

This is a multipart message in MIME format.

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Hi Herold,

=20

I am puzzled by your statement that a thermostat can maintain a coolant =
temperature of + 20 degrees. Once a thermostat has opened at its set =
temperature, at least for our 1950=E2=80=99s engine technology, I =
believe the thermostat cannot regulate the coolant temperature unless =
the operating conditions of the engine are radically changed because the =
coolant temperature would be regulated by the air flow through the =
radiator. To put it another way, once the thermostat is fully open the =
coolant temperature is regulated by the radiator, if the thermostat were =
to close the coolant temperature would be regulated by the engine =
temperature which could only be higher because of the combustion =
temperatures.=20

=20

John

=20

From: Healeys <[email-masked]> On Behalf Of Harold =
Manifold
Sent: Wednesday, September 17, 2025 1:52 PM
To: Richard Mayor <[email-masked]>
Cc: Richard Antal <[email-masked]>; Healeys =
<[email-masked]>
Subject: Re: [Healeys] radiator thermostat

=20

Hi All,

=20

=20

I use a 180-degree thermostat in my car. However, what's equally =
important is how effectively the thermostat regulates the coolant =
temperature. A thermostat that is fully closed or fully open is no =
longer actively controlling the temperature. The normal operating range =
is typically the opening temperature plus 20 degrees. For example, a =
165-degree thermostat should maintain the temperature between 165 and =
185 degrees, while a 180-degree thermostat should keep it between 180 =
and 200 degrees.

=20

If your current thermostat maintains the coolant temperature within its =
specified range under normal driving conditions, then it's the correct =
one for your needs.

=20

Harold

=20

On Wed, Sep 17, 2025 at 1:36=E2=80=AFPM Richard Mayor =

165 is too cold for good running.  Our engines run better in the 180 to =
190 range. =20

=20

=20

Sent from my iPad

On Sep 17, 2025, at 12:13=E2=80=AFPM, Robert Markovich via Healeys =

 =
<https://aolapp.onelink.me/eG2g?pid=3DNativePlacement&c=3DUS_Acquisition_=
YMktg_320_EmailSignature_AttributionDL&af_sub1=3DAcquisition&af_sub2=3DUS=
_YMktg&af_sub3=3D&af_sub4=3D100002473&af_sub5=3DSentFromNewAOLApp__Inters=
titial_&af_ios_store_cpp=3Dce85ce34-ad0f-4811-a92b-a172743b064e&af_androi=
d_url=3Dhttps%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom=
.aol.mobile.aolapp%26listing%3Demail_signature_attribution> Sent from =
the all new AOL app for iOS

=20

On Wednesday, September 17, 2025, 2:50 PM, Richard Antal via Healeys =

Gents,

     What is the desired coolant temperature for optimal engine =
performance? I've searched the tech articles and can find nothing that =
specifically answers that question. This summer my BJ8 seemed to run =
fine with a 160 thermostat which, according to the gauge which I've =
checked and found to be accurate, kept the coolant at around 165. Thanks =
to all who respond.

rich antal

Archive: http://www.team.net/pipermail/healeys =
http://autox.team.net/archive/healeys

Archive: http://www.team.net/pipermail/healeys =
http://autox.team.net/archive/healeys

Archive: http://www.team.net/pipermail/healeys =
http://autox.team.net/archive/healeys

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xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" =
xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta =
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vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Hi =
Herold,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>I am puzzled =
by your statement that a thermostat can maintain a coolant temperature =
of <u>+</u> 20 degrees. Once a thermostat has opened at its set =
temperature, at least for our 1950=E2=80=99s engine technology, I =
believe the thermostat cannot regulate the coolant temperature unless =
the operating conditions of the engine are radically changed because the =
coolant temperature would be regulated by the air flow through the =
radiator. To put it another way, once the thermostat is fully open the =
coolant temperature is regulated by the radiator, if the thermostat were =
to close the coolant temperature would be regulated by the engine =
temperature which could only be higher because of the combustion =
temperatures. <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>John<o:p></o:=
p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Healeys &lt;[email-masked]&gt; <b>On Behalf Of =
</b>Harold Manifold<br><b>Sent:</b> Wednesday, September 17, 2025 1:52 =
PM<br><b>To:</b> Richard Mayor =
&lt;[email-masked]&gt;<br><b>Cc:</b> Richard Antal =
&lt;[email-masked]&gt;; Healeys =
&lt;[email-masked]&gt;<br><b>Subject:</b> Re: [Healeys] radiator =
thermostat<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>Hi =
All,<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Thermostats always generate interesting =
discussions.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
use a 180-degree thermostat in my car. However, what's equally important =
is how effectively the thermostat regulates the coolant temperature. A =
thermostat that is fully closed or fully open is no longer actively =
controlling the temperature. The normal operating range is typically the =
opening temperature plus 20 degrees. For example, a 165-degree =
thermostat should maintain the temperature between 165 and 185 degrees, =
while a 180-degree thermostat should keep it between 180 and 200 =
degrees.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>If your current thermostat maintains the coolant =
temperature within its specified range under normal driving conditions, =
then it's the correct one for your needs.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Harold<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>On =
Wed, Sep 17, 2025 at 1:36<span =
style=3D'font-family:"Arial",sans-serif'>=E2=80=AF</span>PM Richard =
Mayor &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><p class=3DMsoNormal>165 =
is too cold for good running.&nbsp; Our engines run better in the 180 to =
190 range. &nbsp;<o:p></o:p></p><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>Sent from my iPad<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>On Sep 17, 2025, at 12:13<span =
style=3D'font-family:"Arial",sans-serif'>=E2=80=AF</span>PM, Robert =
Markovich via Healeys &lt;<a href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a>&gt; =
wrote:<o:p></o:p></p></blockquote></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span =
style=3D'font-family:"Tahoma",sans-serif'>=EF=BB=BF</span> 165 is the =
one I use<br><br><o:p></o:p></p><div><p class=3DMsoNormal><a =
href=3D"https://aolapp.onelink.me/eG2g?pid=3DNativePlacement&amp;c=3DUS_A=
cquisition_YMktg_320_EmailSignature_AttributionDL&amp;af_sub1=3DAcquisiti=
on&amp;af_sub2=3DUS_YMktg&amp;af_sub3=3D&amp;af_sub4=3D100002473&amp;af_s=
ub5=3DSentFromNewAOLApp__Interstitial_&amp;af_ios_store_cpp=3Dce85ce34-ad=
0f-4811-a92b-a172743b064e&amp;af_android_url=3Dhttps%3A%2F%2Fplay.google.=
com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Dema=
il_signature_attribution" target=3D"_blank"><span =
style=3D'font-size:9.0pt'>Sent from the all new AOL app for =
iOS</span></a><o:p></o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p style=3D'margin-top:0in'><span =
style=3D'font-size:11.5pt;color:#8473FF'>On Wednesday, September 17, =
2025, 2:50 PM, Richard Antal via Healeys &lt;<a =
href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a>&gt; =
wrote:<o:p></o:p></span></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div =
id=3D"m_3862331438548245316yiv6324880639"><div><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif'>Gents,<o:p>=
</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif'>&nbsp; =
&nbsp; &nbsp;What is the desired coolant temperature for optimal engine =
performance? I've searched the tech articles and can find nothing that =
specifically answers that question. This summer my BJ8 seemed to run =
fine with a 160 thermostat which, according to the gauge which I've =
checked and found to be accurate, kept the coolant at around 165. Thanks =
to all who respond.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif'>rich =
antal<o:p></o:p></span></p></div></div></div></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br>Support Team.Net <a href=3D"http://www.team.net/donate.html" =
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[email-masked]

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---

From: David Nock via Healeys <[email-masked]>
Date: Thu, 18 Sep 2025 08:37:07 -0700

This is a multi-part message in MIME format.
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The thermostat does not control the high end temperature of the engine. 
Its job is to get the engine up to an operating temperature as soon as 
possible. Then in maintains the low end temperature of the engine. Once 
the thermostat is open the engine temperature is controlled by the 
radiator, radiator fan and air flow.

On the 6 cylinder engine there is a sleeve attached to the thermostat, 
that blocks off a bypass in the cylinder head. The bypass is there to 
allow the coolant to flow when the thermostat is closed. Once the 
thermostat is open the sleeve is there to block the bypass allowing ALL 
the coolant to flow thru the radiator.

David Nock

British Car Specialists

On 9/17/2025 12:54 PM, Richard Mayor wrote:
> 165 is too cold for good running.  Our engines run better in the 180 
> to 190 range.
>
> Sent from my iPad
>
>> On Sep 17, 2025, at 12:13 PM, Robert Markovich via Healeys 
>> <[email-masked]> wrote:
>>
>>  165 is the one I use
>>
>>
>> <https://aolapp.onelink.me/eG2g?pid=NativePlacement&c=US_Acquisition_YMktg_320_EmailSignature_AttributionDL&af_sub1=Acquisition&af_sub2=US_YMktg&af_sub3=&af_sub4=100002473&af_sub5=SentFromNewAOLApp__Interstitial_&af_ios_store_cpp=ce85ce34-ad0f-4811-a92b-a172743b064e&af_android_url=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Demail_signature_attribution>
>>
>> On Wednesday, September 17, 2025, 2:50 PM, Richard Antal via Healeys 
>> <[email-masked]> wrote:
>>
>>     Gents,
>>     performance? I've searched the tech articles and can find nothing
>>     that specifically answers that question. This summer my BJ8
>>     seemed to run fine with a 160 thermostat which, according to the
>>     gauge which I've checked and found to be accurate, kept the
>>     coolant at around 165. Thanks to all who respond.
>>     rich antal
> Support Team.Nethttp://www.team.net/donate.html
> Archive:http://www.team.net/pipermail/healeys http://autox.team.net/archive/healeys
>
> [email-masked]
> Unsubscribe/Manage:http://autox.team.net/mailman/options/healeys/[email-masked]
>
-- 
David Nock
British Car Specialists
Stockton Ca
209 948 8767
www.britishcarspecialists.com

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    <p>The thermostat does not control the high end temperature of the
      engine. Its job is to get the engine up to an operating
      temperature as soon as possible. Then in maintains the low end
      temperature of the engine. Once the thermostat is open the engine
      temperature is controlled by the radiator, radiator fan and air
      flow.</p>
    <p>On the 6 cylinder engine there is a sleeve attached to the
      thermostat, that blocks off a bypass in the cylinder head. The
      bypass is there to allow the coolant to flow when the thermostat
      is closed. Once the thermostat is open the sleeve is there to
      block the bypass allowing ALL the coolant to flow thru the
      radiator. </p>
    <p>David Nock</p>
    <p>British Car Specialists</p>
    <p><br>
    </p>
    <div class="moz-cite-prefix">On 9/17/2025 12:54 PM, Richard Mayor
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:[email-masked]">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      165 is too cold for good running.  Our engines run better in the
      180 to 190 range.  
      <div> </div>
      <div><br>
        <div>
          <div dir="ltr">Sent from my iPad</div>
          <div dir="ltr"><br>
            <blockquote type="cite">On Sep 17, 2025, at 12:13 PM, Robert
              Markovich via Healeys <a class="moz-txt-link-rfc2396E" href="mailto:[email-masked]">&lt;[email-masked]&gt;</a>
              wrote:<br>
              <br>
            </blockquote>
          </div>
          <blockquote type="cite">
            <div dir="ltr"><!--[if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]-->
              165 is the one I use<br>
              <br>
              <br>
              <div class="yahoo-signature"><a style="font-size:12px"
href="https://aolapp.onelink.me/eG2g?pid=NativePlacement&amp;c=US_Acquisition_YMktg_320_EmailSignature_AttributionDL&amp;af_sub1=Acquisition&amp;af_sub2=US_YMktg&amp;af_sub3=&amp;af_sub4=100002473&amp;af_sub5=SentFromNewAOLApp__Interstitial_&amp;af_ios_store_cpp=ce85ce34-ad0f-4811-a92b-a172743b064e&amp;af_android_url=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Demail_signature_attribution"
                  moz-do-not-send="true">Sent from the all new AOL app
                  for iOS</a><br>
              </div>
              <br>
              <p class="yahoo-quoted-begin"
style="font-size: 15px; color: rgb(132, 115, 255); padding-top: 15px; margin-top: 0px;">On
                Wednesday, September 17, 2025, 2:50 PM, Richard Antal
                via Healeys <a class="moz-txt-link-rfc2396E" href="mailto:[email-masked]">&lt;[email-masked]&gt;</a> wrote:</p>
              <blockquote class="iosymail">
                <div id="yiv6324880639">
                  <div>
                    <div
style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"
                      class="yiv6324880639yahoo-style-wrap">
                      <div dir="ltr">Gents,</div>
                      <div dir="ltr">     What is the desired coolant
                        temperature for optimal engine performance? I've
                        searched the tech articles and can find nothing
                        that specifically answers that question. This
                        summer my BJ8 seemed to run fine with a 160
                        thermostat which, according to the gauge which
                        I've checked and found to be accurate, kept the
                        coolant at around 165. Thanks to all who
                        respond.</div>
                      <div dir="ltr">rich antal</div>
                    </div>
                  </div>
                </div>
                _______________________________________________<br>
                Support Team.Net <a
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                Suggested annual donation  $12.75<br>
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      <br>
      <fieldset class="moz-mime-attachment-header"></fieldset>
      <pre wrap="" class="moz-quote-pre">_______________________________________________

Archive: <a class="moz-txt-link-freetext" href="http://www.team.net/pipermail/healeys">http://www.team.net/pipermail/healeys</a> <a class="moz-txt-link-freetext" href="http://autox.team.net/archive/healeys">http://autox.team.net/archive/healeys</a>

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</pre>
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    <pre class="moz-signature" cols="72">-- 
David Nock
British Car Specialists
Stockton Ca  
209 948 8767
<a class="moz-txt-link-abbreviated" href="http://www.britishcarspecialists.com">www.britishcarspecialists.com</a></pre>
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[email-masked]

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From: <[email-masked]>
Date: Thu, 18 Sep 2025 12:24:27 -0400

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I have run one of BCS (David=E2=80=99s) sleeved 160 thermostats in my =
BT7 for decades and I works perfectly.

=20

Just say=E2=80=99n,

=20

Mirek

=20

From: Healeys <[email-masked]> On Behalf Of David Nock =
via Healeys
Sent: September 18, 2025 11:37 AM
To: Richard Mayor <[email-masked]>; Robert Markovich =
<[email-masked]>
Cc: Richard Antal <[email-masked]>; Healeys =
<[email-masked]>
Subject: Re: [Healeys] radiator thermostat

=20

The thermostat does not control the high end temperature of the engine. =
Its job is to get the engine up to an operating temperature as soon as =
possible. Then in maintains the low end temperature of the engine. Once =
the thermostat is open the engine temperature is controlled by the =
radiator, radiator fan and air flow.

On the 6 cylinder engine there is a sleeve attached to the thermostat, =
that blocks off a bypass in the cylinder head. The bypass is there to =
allow the coolant to flow when the thermostat is closed. Once the =
thermostat is open the sleeve is there to block the bypass allowing ALL =
the coolant to flow thru the radiator.=20

David Nock

British Car Specialists

=20

=20

=20

Sent from my iPad

 =

=20

Gents,

rich antal

http://autox.team.net/mailman/options/healeys/[email-masked]
=20

--=20
David Nock
British Car Specialists
Stockton Ca =20
209 948 8767
www.britishcarspecialists.com <http://www.britishcarspecialists.com>=20

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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-CA link=3Dblue =
vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'>I have run one of BCS (David=E2=80=99s) sleeved 160 =
thermostats in my BT7 for decades and I works =
perfectly.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'>Just say=E2=80=99n,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'>Mirek<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> Healeys =
&lt;[email-masked]&gt; <b>On Behalf Of </b>David Nock =
via Healeys<br><b>Sent:</b> September 18, 2025 11:37 AM<br><b>To:</b> =
Richard Mayor &lt;[email-masked]&gt;; Robert Markovich =
&lt;[email-masked]&gt;<br><b>Cc:</b> Richard Antal =
&lt;[email-masked]&gt;; Healeys =
&lt;[email-masked]&gt;<br><b>Subject:</b> Re: [Healeys] radiator =
thermostat<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p>The thermostat does not =
control the high end temperature of the engine. Its job is to get the =
engine up to an operating temperature as soon as possible. Then in =
maintains the low end temperature of the engine. Once the thermostat is =
open the engine temperature is controlled by the radiator, radiator fan =
and air flow.<o:p></o:p></p><p>On the 6 cylinder engine there is a =
sleeve attached to the thermostat, that blocks off a bypass in the =
cylinder head. The bypass is there to allow the coolant to flow when the =
thermostat is closed. Once the thermostat is open the sleeve is there to =
block the bypass allowing ALL the coolant to flow thru the =
radiator.&nbsp;<o:p></o:p></p><p>David Nock<o:p></o:p></p><p>British Car =
Specialists<o:p></o:p></p><p><o:p>&nbsp;</o:p></p><div><p =
class=3DMsoNormal>On 9/17/2025 12:54 PM, Richard Mayor =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal>165 =
is too cold for good running. &nbsp;Our engines run better in the 180 to =
190 range. &nbsp; <o:p></o:p></p><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>Sent from my iPad<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>On Sep 17, 2025, at 12:13<span =
style=3D'font-family:"Arial",sans-serif'>=E2=80=AF</span>PM, Robert =
Markovich via Healeys <a =
href=3D"mailto:[email-masked]">&lt;[email-masked]&gt;</a>=
 wrote:<o:p></o:p></p></blockquote></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span =
style=3D'font-family:"Tahoma",sans-serif'>=EF=BB=BF</span> 165 is the =
one I use<br><br><o:p></o:p></p><div><p class=3DMsoNormal><a =
href=3D"https://aolapp.onelink.me/eG2g?pid=3DNativePlacement&amp;c=3DUS_A=
cquisition_YMktg_320_EmailSignature_AttributionDL&amp;af_sub1=3DAcquisiti=
on&amp;af_sub2=3DUS_YMktg&amp;af_sub3=3D&amp;af_sub4=3D100002473&amp;af_s=
ub5=3DSentFromNewAOLApp__Interstitial_&amp;af_ios_store_cpp=3Dce85ce34-ad=
0f-4811-a92b-a172743b064e&amp;af_android_url=3Dhttps%3A%2F%2Fplay.google.=
com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Dema=
il_signature_attribution"><span style=3D'font-size:9.0pt'>Sent from the =
all new AOL app for iOS</span></a><o:p></o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3Dyahoo-quoted-begin =
style=3D'margin-top:0cm'><span =
style=3D'font-size:11.5pt;color:#8473FF'>On Wednesday, September 17, =
2025, 2:50 PM, Richard Antal via Healeys <a =
href=3D"mailto:[email-masked]">&lt;[email-masked]&gt;</a>=
 wrote:<o:p></o:p></span></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div =
id=3Dyiv6324880639><div><div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif'>Gents,<o:p>=
</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif'>&nbsp; =
&nbsp; &nbsp;What is the desired coolant temperature for optimal engine =
performance? I've searched the tech articles and can find nothing that =
specifically answers that question. This summer my BJ8 seemed to run =
fine with a 160 thermostat which, according to the gauge which I've =
checked and found to be accurate, kept the coolant at around 165. Thanks =
to all who respond.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif'>rich =
antal<o:p></o:p></span></p></div></div></div></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br>Support Team.Net <a href=3D"http://www.team.net/donate.html" =
target=3D"_blank">http://www.team.net/donate.html</a><br>Suggested =
annual donation&nbsp; $12.75<br><br>Archive: <a =
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target=3D"_blank">http://www.team.net/pipermail/healeys</a> <a =
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target=3D"_blank">http://autox.team.net/archive/healeys</a><br><br><a =
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[email-masked]</a><o:p></o:p></p></blockquote><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br>Support Team.Net <a =
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ive/healeys</a><br><br><a =
href=3D"mailto:[email-masked]">[email-masked]</a><br><a =
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class=3DMsoNormal><br><br><o:p></o:p></p><pre>___________________________=
____________________<o:p></o:p></pre><pre>Support Team.Net <a =
href=3D"http://www.team.net/donate.html">http://www.team.net/donate.html<=
/a><o:p></o:p></pre><pre>Suggested annual donation=C2=A0 =
$12.75<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>Archive: <a =
href=3D"http://www.team.net/pipermail/healeys">http://www.team.net/piperm=
ail/healeys</a> <a =
href=3D"http://autox.team.net/archive/healeys">http://autox.team.net/arch=
ive/healeys</a><o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre><a =
href=3D"mailto:[email-masked]">[email-masked]</a><o:p></o=
:p></pre><pre><a =
href=3D"http://autox.team.net/mailman/listinfo/healeys">http://autox.team=
.net/mailman/listinfo/healeys</a><o:p></o:p></pre><pre><o:p>&nbsp;</o:p><=
/pre><pre>Unsubscribe/Manage: <a =
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et</a><o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre></blockquote><pre>-- =
<o:p></o:p></pre><pre>David Nock<o:p></o:p></pre><pre>British Car =
Specialists<o:p></o:p></pre><pre>Stockton Ca=C2=A0 =
<o:p></o:p></pre><pre>209 948 8767<o:p></o:p></pre><pre><a =
href=3D"http://www.britishcarspecialists.com">www.britishcarspecialists.c=
om</a><o:p></o:p></pre></div></body></html>
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[email-masked]

--===============5677400519467710299==--

---

From: Harold Manifold <[email-masked]>
Date: Thu, 18 Sep 2025 10:38:24 -0700

--===============0393405001816599454==

--000000000000978396063f16d28d
Content-Transfer-Encoding: quoted-printable

Hi All,

Thermostats and Healey cooling always generate interesting discussions, and
I'd like to clarify my previous comments on what controls (or often doesn't
control) the coolant temperature.

To summarize some of the points made: Coolant flows down the radiator, out
the bottom hose, and into the water pump. It's then pumped into the engine
block's cooling jacket. The goal is to direct the coolest fluid to the
hottest part of the engine for optimal heat transfer (i.e., the largest
delta T). The coolant, having absorbed heat, then moves up to the cylinder
head, through the thermostat, and back to the radiator. This process is
known as thermosiphoning, where heated coolant rises through the engine and
falls as it cools in the radiator.

The heat generated by the engine is a function of the combustion process
(timing, carburation, etc.) and horsepower efficiency loss. More horsepower
output means more heat transferred to the coolant. The radiator removes
this heat, but its effectiveness is proportional to the difference between
the air and coolant temperatures.

Assuming the radiator has sufficient capacity to remove heat, if the
coolant temperature the thermostat "sees" is less than its opening
temperature plus 20 degrees, the thermostat will slightly close to restrict
flow to the radiator. In this scenario, the thermostat is actively
controlling the coolant temperature. However, if the coolant temperature
exceeds 20 degrees above the thermostat's opening temperature, then the
coolant temperature is primarily a function of the incoming air
temperature, and the thermostat is no longer a factor. In such cases, the
coolant temperature is effectively uncontrolled by the thermostat.

To add to the discussion, the engine fan has minimal effect at speeds
greater than 15 miles per hour.

Harold

On Thu, Sep 18, 2025 at 8:46=E2=80=AFAM David Nock via Healeys <
[email-masked]> wrote:

> possible. Then in maintains the low end temperature of the engine. Once t=
he
> thermostat is open the engine temperature is controlled by the radiator,
> radiator fan and air flow.
>
> that blocks off a bypass in the cylinder head. The bypass is there to all=
ow
> the coolant to flow when the thermostat is closed. Once the thermostat is
> open the sleeve is there to block the bypass allowing ALL the coolant to
> flow thru the radiator.
>
> David Nock
>
> British Car Specialists
>
>
> On Sep 17, 2025, at 12:13=E2=80=AFPM, Robert Markovich via Healeys
> <[email-masked]> <[email-masked]> wrote:
>
> <[email-masked]> <[email-masked]> wrote:
>
> Gents,
d
> Archive: http://www.team.net/pipermail/healeys http://autox.team.net/arch=
ive/healeys
> [email-masked]://autox.team.net/mailman/listinfo/healeys
>
> Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/healeyd=
[email-masked]
>
> --
> David Nock
> British Car Specialists
> Stockton Ca
> 209 948 8767www.britishcarspecialists.com
>

--000000000000978396063f16d28d
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi All,</div><div><br></div><div>Thermostats and Heal=
ey cooling always generate interesting discussions, and I&#39;d like to cla=
rify my previous comments on what controls (or often doesn&#39;t control) t=
he coolant temperature.</div><div><br></div><div>To summarize some of the p=
oints made: Coolant flows down the radiator, out the bottom hose, and into =
the water pump. It&#39;s then pumped into the engine block&#39;s cooling ja=
cket. The goal is to direct the coolest fluid to the hottest part of the en=
gine for optimal heat transfer (i.e., the largest delta T). The coolant, ha=
ving absorbed heat, then moves up to the cylinder head, through the thermos=
tat, and back to the radiator. This process is known as thermosiphoning, wh=
ere heated coolant rises through the engine and falls as it cools in the ra=
diator.</div><div><br></div><div>The heat generated by the engine is a func=
tion of the combustion process (timing, carburation, etc.) and horsepower e=
fficiency loss. More horsepower output means more heat transferred to the c=
oolant. The radiator removes this heat, but its effectiveness is proportion=
al to the difference between the air and coolant temperatures.</div><div><b=
r></div><div>Assuming the radiator has sufficient capacity to remove heat, =
if the coolant temperature the thermostat &quot;sees&quot; is less than its=
 opening temperature plus 20 degrees, the thermostat will slightly close to=
 restrict flow to the radiator. In this scenario, the thermostat is activel=
y controlling the coolant temperature. However, if the coolant temperature =
exceeds 20 degrees above the thermostat&#39;s opening temperature, then the=
 coolant temperature is primarily a function of the incoming air temperatur=
e, and the thermostat is no longer a factor. In such cases, the coolant tem=
perature is effectively uncontrolled by the thermostat.</div><div><br></div=
><div>To add to the discussion, the engine fan has minimal effect at speeds=
 greater than 15 miles per hour.</div><div><br></div><div>Harold</div></div=
><br><div class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" clas=
s=3D"gmail_attr">On Thu, Sep 18, 2025 at 8:46=E2=80=AFAM David Nock via Hea=
leys &lt;<a href=3D"mailto:[email-masked]">[email-masked]</=
a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0p=
x 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u=
></u>

 =20
   =20
 =20
  <div style=3D"padding-bottom:1px">
    <p>The thermostat does not control the high end temperature of the
      engine. Its job is to get the engine up to an operating
      temperature as soon as possible. Then in maintains the low end
      temperature of the engine. Once the thermostat is open the engine
      temperature is controlled by the radiator, radiator fan and air
      flow.</p>
    <p>On the 6 cylinder engine there is a sleeve attached to the
      thermostat, that blocks off a bypass in the cylinder head. The
      bypass is there to allow the coolant to flow when the thermostat
      is closed. Once the thermostat is open the sleeve is there to
      block the bypass allowing ALL the coolant to flow thru the
      radiator.=C2=A0</p>
    <p>David Nock</p>
    <p>British Car Specialists</p>
    <p><br>
    </p>
    <div>On 9/17/2025 12:54 PM, Richard Mayor
      wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      165 is too cold for good running.=C2=A0 Our engines run better in the
      180 to 190 range. =C2=A0
      <div>=C2=A0</div>
      <div><br>
        <div>
          <div dir=3D"ltr">Sent from my iPad</div>
          <div dir=3D"ltr"><br>
            <blockquote type=3D"cite">On Sep 17, 2025, at 12:13=E2=80=AFPM,=
 Robert
              Markovich via Healeys <a href=3D"mailto:[email-masked]=
t" target=3D"_blank">&lt;[email-masked]&gt;</a>
              wrote:<br>
              <br>
            </blockquote>
          </div>
          <blockquote type=3D"cite">
            <div dir=3D"ltr">=EF=BB=BF
              165 is the one I use<br>
              <br>
              <br>
              <div><a style=3D"font-size:12px" href=3D"https://aolapp.oneli=
nk.me/eG2g?pid=3DNativePlacement&amp;c=3DUS_Acquisition_YMktg_320_EmailSign=
ature_AttributionDL&amp;af_sub1=3DAcquisition&amp;af_sub2=3DUS_YMktg&amp;af=
_sub3=3D&amp;af_sub4=3D100002473&amp;af_sub5=3DSentFromNewAOLApp__Interstit=
ial_&amp;af_ios_store_cpp=3Dce85ce34-ad0f-4811-a92b-a172743b064e&amp;af_and=
roid_url=3Dhttps%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dco=
m.aol.mobile.aolapp%26listing%3Demail_signature_attribution" target=3D"_bla=
nk">Sent from the all new AOL app
                  for iOS</a><br>
              </div>
              <br>
              <p style=3D"font-size:15px;color:rgb(132,115,255);padding-top=
:15px;margin-top:0px">On
                Wednesday, September 17, 2025, 2:50 PM, Richard Antal
                via Healeys <a href=3D"mailto:[email-masked]" targe=
t=3D"_blank">&lt;[email-masked]&gt;</a> wrote:</p>
              <blockquote>
                <div id=3D"m_2673071501772592614yiv6324880639">
                  <div>
                    <div style=3D"font-family:&quot;Helvetica Neue&quot;,He=
lvetica,Arial,sans-serif;font-size:13px">
                      <div dir=3D"ltr">Gents,</div>
                      <div dir=3D"ltr">=C2=A0 =C2=A0 =C2=A0What is the desi=
red coolant
                        temperature for optimal engine performance? I&#39;v=
e
                        searched the tech articles and can find nothing
                        that specifically answers that question. This
                        summer my BJ8 seemed to run fine with a 160
                        thermostat which, according to the gauge which
                        I&#39;ve checked and found to be accurate, kept the
                        coolant at around 165. Thanks to all who
                        respond.</div>
                      <div dir=3D"ltr">rich antal</div>
                    </div>
                  </div>
                </div>
                _______________________________________________<br>
                Support Team.Net <a href=3D"http://www.team.net/donate.html=
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              </blockquote>
              <span>_______________________________________________</span><=
br>
              <span>Support Team.Net <a href=3D"http://www.team.net/donate.=
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    <pre cols=3D"72">--=20
David Nock
British Car Specialists
Stockton Ca =20
209 948 8767
<a href=3D"http://www.britishcarspecialists.com" target=3D"_blank">www.brit=
ishcarspecialists.com</a></pre>
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  <u></u><u></u>

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[email-masked]

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---

From: Simon Lachlan via Healeys <[email-masked]>
Date: Thu, 18 Sep 2025 21:15:53 +0100

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Hi,&nbsp;<div>The original sleeved ones are=
 - I think - easier to find in the UK. Certainly, I managed to find a few. I=
 was advised that the Morgan people were a good source. I bought mine on eBa=
y but that was a while ago. Simon<br id=3D"lineBreakAtBeginningOfSignature">=
<div dir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br><blockquote t=
ype=3D"cite">On 18 Sep 2025, at 18:54, Harold Manifold &lt;[email-masked]=
t&gt; wrote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D=
"ltr">=EF=BB=BF<div dir=3D"ltr"><div>Hi All,</div><div><br></div><div>Thermo=
stats and Healey cooling always generate interesting discussions, and I'd li=
ke to clarify my previous comments on what controls (or often doesn't contro=
l) the coolant temperature.</div><div><br></div><div>To summarize some of th=
e points made: Coolant flows down the radiator, out the bottom hose, and int=
o the water pump. It's then pumped into the engine block's cooling jacket. T=
he goal is to direct the coolest fluid to the hottest part of the engine for=
 optimal heat transfer (i.e., the largest delta T). The coolant, having abso=
rbed heat, then moves up to the cylinder head, through the thermostat, and b=
ack to the radiator. This process is known as thermosiphoning, where heated c=
oolant rises through the engine and falls as it cools in the radiator.</div>=
<div><br></div><div>The heat generated by the engine is a function of the co=
mbustion process (timing, carburation, etc.) and horsepower efficiency loss.=
 More horsepower output means more heat transferred to the coolant. The radi=
ator removes this heat, but its effectiveness is proportional to the differe=
nce between the air and coolant temperatures.</div><div><br></div><div>Assum=
ing the radiator has sufficient capacity to remove heat, if the coolant temp=
erature the thermostat "sees" is less than its opening temperature plus 20 d=
egrees, the thermostat will slightly close to restrict flow to the radiator.=
 In this scenario, the thermostat is actively controlling the coolant temper=
ature. However, if the coolant temperature exceeds 20 degrees above the ther=
mostat's opening temperature, then the coolant temperature is primarily a fu=
nction of the incoming air temperature, and the thermostat is no longer a fa=
ctor. In such cases, the coolant temperature is effectively uncontrolled by t=
he thermostat.</div><div><br></div><div>To add to the discussion, the engine=
 fan has minimal effect at speeds greater than 15 miles per hour.</div><div>=
<br></div><div>Harold</div></div><br><div class=3D"gmail_quote gmail_quote_c=
ontainer"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Sep 18, 2025 at 8:46=
=E2=80=AFAM David Nock via Healeys &lt;<a href=3D"mailto:[email-masked].=
net">[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,20=
4,204);padding-left:1ex"><u></u>

 =20
   =20
 =20
  <div style=3D"padding-bottom:1px">
    <p>The thermostat does not control the high end temperature of the
      engine. Its job is to get the engine up to an operating
      temperature as soon as possible. Then in maintains the low end
      temperature of the engine. Once the thermostat is open the engine
      temperature is controlled by the radiator, radiator fan and air
      flow.</p>
    <p>On the 6 cylinder engine there is a sleeve attached to the
      thermostat, that blocks off a bypass in the cylinder head. The
      bypass is there to allow the coolant to flow when the thermostat
      is closed. Once the thermostat is open the sleeve is there to
      block the bypass allowing ALL the coolant to flow thru the
      radiator.&nbsp;</p>
    <p>David Nock</p>
    <p>British Car Specialists</p>
    <p><br>
    </p>
    <div>On 9/17/2025 12:54 PM, Richard Mayor
      wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      165 is too cold for good running.&nbsp; Our engines run better in the
      180 to 190 range. &nbsp;
      <div>&nbsp;</div>
      <div><br>
        <div>
          <div dir=3D"ltr">Sent from my iPad</div>
          <div dir=3D"ltr"><br>
            <blockquote type=3D"cite">On Sep 17, 2025, at 12:13=E2=80=AFPM, R=
obert
              Markovich via Healeys <a href=3D"mailto:[email-masked]=
" target=3D"_blank">&lt;[email-masked]&gt;</a>
              wrote:<br>
              <br>
            </blockquote>
          </div>
          <blockquote type=3D"cite">
            <div dir=3D"ltr">=EF=BB=BF
              165 is the one I use<br>
              <br>
              <br>
              <div><a style=3D"font-size:12px" href=3D"https://aolapp.onelin=
k.me/eG2g?pid=3DNativePlacement&amp;c=3DUS_Acquisition_YMktg_320_EmailSignat=
ure_AttributionDL&amp;af_sub1=3DAcquisition&amp;af_sub2=3DUS_YMktg&amp;af_su=
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mobile.aolapp%26listing%3Demail_signature_attribution" target=3D"_blank">Sen=
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                  for iOS</a><br>
              </div>
              <br>
              <p style=3D"font-size:15px;color:rgb(132,115,255);padding-top:=
15px;margin-top:0px">On
                Wednesday, September 17, 2025, 2:50 PM, Richard Antal
                via Healeys <a href=3D"mailto:[email-masked]" target=
=3D"_blank">&lt;[email-masked]&gt;</a> wrote:</p>
              <blockquote>
                <div id=3D"m_2673071501772592614yiv6324880639">
                  <div>
                    <div style=3D"font-family:&quot;Helvetica Neue&quot;,Hel=
vetica,Arial,sans-serif;font-size:13px">
                      <div dir=3D"ltr">Gents,</div>
                      <div dir=3D"ltr">&nbsp; &nbsp; &nbsp;What is the desir=
ed coolant
                        temperature for optimal engine performance? I've
                        searched the tech articles and can find nothing
                        that specifically answers that question. This
                        summer my BJ8 seemed to run fine with a 160
                        thermostat which, according to the gauge which
                        I've checked and found to be accurate, kept the
                        coolant at around 165. Thanks to all who
                        respond.</div>
                      <div dir=3D"ltr">rich antal</div>
                    </div>
                  </div>
                </div>
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    <pre cols=3D"72">--=20
David Nock
British Car Specialists
Stockton Ca =20
209 948 8767
<a href=3D"http://www.britishcarspecialists.com" target=3D"_blank">www.briti=
shcarspecialists.com</a></pre>
  </div>
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---

From: "Leonard Hartnett" <[email-masked]>
Date: Thu, 18 Sep 2025 22:24:17 -0700

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I purchased my Healey while stationed at RAF Bentwaters in England about 80=
 miles northeast of London and about 10 miles from the English Channel.  Th=
e average annual temperature at Bentwaters is 46  to 72 degrees F.  

Perhaps because the temperature was relativaly cool AND the fan was so nois=
ey, I removed it.  I found that as long as I could keep moving, the engine =
did not overheat.  I was not in a heavely populated area that involved a lo=
t of stop and go traffic or long idles.  Back to the US and the Sacramento =
Valley area, the fan had to be reinstalled.

Returning from a meet on Vancouver Island, the fan threw a blade in Washing=
ton..  It did some major damage to the radiator.  We were able to get the d=
amaged tubes soldered closed and drove home with the damaged radiator and w=
ithout the fan.  Mostly Interstate, thank goodness.  Made it home successfu=
lly.

I tried an electric fan alone but it was not successful.  I left it install=
ed but put the engine fan back on..  The electrec fan is thermostatically c=
ontrolled and only comes on when the temp rises.  I do not know what that t=
emp is but I think it is about 180 degrees.   Some have suggested that moun=
ting an eletric fan blocks the radiator.  I have not found it to be a probl=
em. 

Double your pleasure, double your fun (Doublemint Gum) 

              The Other Len
1967 Austin-Healey 3000 MkIII BJ8
                HBJ8L39031
               225,936 miles

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<HTML><HEAD>
<META content=3D"text/html; charset=3Dutf-8" http-equiv=3DContent-Type>
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<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>I purchased my Healey while stationed at R=
AF 
Bentwaters in England </FONT><FONT size=3D2 face=3DArial>about 80 miles nor=
theast of 
London and about&nbsp;10 miles from the English Channel.&nbsp;&nbsp;The ave=
rage 
annual temperature&nbsp;at Bentwaters&nbsp;is 46&nbsp; to 72 degrees F.&nbs=
p; 
</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Per</FONT><FONT size=3D2 face=3DArial>haps=
 because the 
temperature was relativaly cool AND the fan was so noisey, I removed it.&nb=
sp; I 
found that as long as I could keep moving, the engine did not overheat.&nbs=
p; I 
was not in a heavely populated area&nbsp;that involved&nbsp;a lot of&nbsp;s=
top 
and go traffic or long idles.&nbsp; Back to the US and the Sacramento Valle=
y 
area, the fan&nbsp;had to be&nbsp;reinstalled.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Returning from a meet on Vancouver Island,=
 the fan 
threw a blade in Washington..&nbsp; It did some major damage to the 
radiator.&nbsp; We were able to get the damaged tubes soldered closed and d=
rove 
home with the damaged radiator and without the fan.&nbsp; Mostly Interstate=
, 
thank goodness.&nbsp; Made it home successfully.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>I tried an electric fan alone but it was n=
ot 
successful.&nbsp; I left it installed but put&nbsp;the engine fan back 
on..&nbsp;&nbsp;T</FONT><FONT size=3D2 face=3DArial>he electrec fan is 
thermostatically controlled and only comes on when the temp rises.&nbsp; I =
do 
not know what that temp is but I think it is about 180 degrees.&nbsp;&nbsp;=
 Some 
have suggested that mounting an eletric fan blocks the radiator.&nbsp; I ha=
ve 
not found it to be a problem.&nbsp;</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Double your pleasure, double your fun (Dou=
blemint 
Gum)&nbsp;</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 
face=3DArial>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; 
The Other Len<BR>1967 Austin-Healey 3000 MkIII 
BJ8<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp; 
HBJ8L39031</FONT></DIV>
<DIV><FONT size=3D2 
face=3DArial>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp; 
225,936 miles</FONT></DIV>
<BLOCKQUOTE 
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---

From: "m.g.sharp--- via Healeys" <[email-masked]>
Date: Fri, 19 Sep 2025 07:58:10 -0400

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Interesting Len.  The previous owner of my BT7, Fergus Ross, who owned =
it for 14 years, would sometimes vacation on Long Island, driving the =
Healey with his lovely wife, Ava-Marie, from Oakville in Ontario.  About =
a 12-14 hour drive.  He told me he used to remove the fan on the long =
journey as he got a bit more power.  I though it a bit extreme as I =
never felt I needed more power in the Healey.  I seem to recall (i.e., I =
am not motivated to look it up to confirm) in his wonderful book about =
Bristols, L.J.K. Setright noted that Bristol experimented with different =
fans on a dynamometer and running sans fan produced about 5 extra BHP.

=20

Mirek

=20

From: Healeys <[email-masked]> On Behalf Of Leonard =
Hartnett
Sent: September 19, 2025 1:24 AM
To: Healeys at Autox <[email-masked]>
Subject: Re: [Healeys] radiator thermostat

=20

I purchased my Healey while stationed at RAF Bentwaters in England about =
80 miles northeast of London and about 10 miles from the English =
Channel.  The average annual temperature at Bentwaters is 46  to 72 =
degrees F. =20

=20

Perhaps because the temperature was relativaly cool AND the fan was so =
noisey, I removed it.  I found that as long as I could keep moving, the =
engine did not overheat.  I was not in a heavely populated area that =
involved a lot of stop and go traffic or long idles.  Back to the US and =
the Sacramento Valley area, the fan had to be reinstalled.

=20

Returning from a meet on Vancouver Island, the fan threw a blade in =
Washington..  It did some major damage to the radiator.  We were able to =
get the damaged tubes soldered closed and drove home with the damaged =
radiator and without the fan.  Mostly Interstate, thank goodness.  Made =
it home successfully.

=20

I tried an electric fan alone but it was not successful.  I left it =
installed but put the engine fan back on..  The electrec fan is =
thermostatically controlled and only comes on when the temp rises.  I do =
not know what that temp is but I think it is about 180 degrees.   Some =
have suggested that mounting an eletric fan blocks the radiator.  I have =
not found it to be a problem.=20

=20

Double your pleasure, double your fun (Doublemint Gum)=20

=20

              The Other Len

               225,936 miles

=20

=20

  _____ =20

 <https://www.avg.com/internet-security>=20

This email has been checked for viruses by AVG antivirus software.=20
www.avg.com <https://www.avg.com/internet-security> =20

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<html xmlns:v=3D"urn:schemas-microsoft-com:vml" =
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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body bgcolor=3Dwhite =
lang=3DEN-CA link=3Dblue vlink=3Dpurple =
style=3D'word-wrap:break-word'><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'>Interesting Len.=C2=A0 The previous owner of my BT7, =
Fergus Ross, who owned it for 14 years, would sometimes vacation on Long =
Island, driving the Healey with his lovely wife, Ava-Marie, from =
Oakville in Ontario.=C2=A0 About a 12-14 hour drive.=C2=A0 He told me he =
used to remove the fan on the long journey as he got a bit more =
power.=C2=A0 I though it a bit extreme as I never felt I needed more =
power in the Healey.=C2=A0 I seem to recall (i.e., I am not motivated to =
look it up to confirm) in his wonderful book about Bristols, L.J.K. =
Setright noted that Bristol experimented with different fans on a =
dynamometer and running sans fan produced about 5 extra =
BHP.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'>Mirek<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> Healeys =
&lt;[email-masked]&gt; <b>On Behalf Of </b>Leonard =
Hartnett<br><b>Sent:</b> September 19, 2025 1:24 AM<br><b>To:</b> =
Healeys at Autox &lt;[email-masked]&gt;<br><b>Subject:</b> Re: =
[Healeys] radiator thermostat<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>I purchased my =
Healey while stationed at RAF Bentwaters in England about 80 miles =
northeast of London and about&nbsp;10 miles from the English =
Channel.&nbsp;&nbsp;The average annual temperature&nbsp;at =
Bentwaters&nbsp;is 46&nbsp; to 72 degrees F.&nbsp; =
</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>Perhaps =
because the temperature was relativaly cool AND the fan was so noisey, I =
removed it.&nbsp; I found that as long as I could keep moving, the =
engine did not overheat.&nbsp; I was not in a heavely populated =
area&nbsp;that involved&nbsp;a lot of&nbsp;stop and go traffic or long =
idles.&nbsp; Back to the US and the Sacramento Valley area, the =
fan&nbsp;had to be&nbsp;reinstalled.</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>Returning from =
a meet on Vancouver Island, the fan threw a blade in Washington..&nbsp; =
It did some major damage to the radiator.&nbsp; We were able to get the =
damaged tubes soldered closed and drove home with the damaged radiator =
and without the fan.&nbsp; Mostly Interstate, thank goodness.&nbsp; Made =
it home successfully.</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>I tried an =
electric fan alone but it was not successful.&nbsp; I left it installed =
but put&nbsp;the engine fan back on..&nbsp;&nbsp;The electrec fan is =
thermostatically controlled and only comes on when the temp rises.&nbsp; =
I do not know what that temp is but I think it is about 180 =
degrees.&nbsp;&nbsp; Some have suggested that mounting an eletric fan =
blocks the radiator.&nbsp; I have not found it to be a =
problem.&nbsp;</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>Double your =
pleasure, double your fun (Doublemint =
Gum)&nbsp;</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The =
Other Len<br>1967 Austin-Healey 3000 MkIII =
BJ8<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; HBJ8L39031</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
225,936 miles</span><o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid black 1.5pt;padding:0cm 0cm 0cm =
4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:=
5.0pt'><p class=3DMsoNormal>&nbsp;<o:p></o:p></p></blockquote><div =
id=3DDAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><o:p>&nbsp;</o:p></p><div =
class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><hr =
size=3D1 width=3D"99%" noshade style=3D'color:#909090' =
align=3Dcenter></div><table class=3DMsoNormalTable border=3D0 =
cellspacing=3D0 cellpadding=3D0 =
style=3D'border-collapse:collapse'><tr><td style=3D'padding:0cm 11.25pt =
0cm 6.0pt'><p class=3DMsoNormal><a =
href=3D"https://www.avg.com/internet-security"><span =
style=3D'border:solid windowtext =
1.0pt;padding:0cm;text-decoration:none'><img border=3D0 width=3D100 =
height=3D100 style=3D'width:1.0416in;height:1.0416in' =
id=3D"Picture_x0020_2" src=3D"cid:~WRD0002.jpg" alt=3D"Image removed by =
sender. AVG logo"></span></a><o:p></o:p></p></td><td =
style=3D'padding:.75pt .75pt .75pt .75pt'><p><span =
style=3D'font-family:"Calibri",sans-serif;color:#3D4D5A'>This email has =
been checked for viruses by AVG antivirus software. <br><a =
href=3D"https://www.avg.com/internet-security">www.avg.com</a> =
<o:p></o:p></span></p></td></tr></table><p =
class=3DMsoNormal><br><br><o:p></o:p></p></div></div></body></html>
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[email-masked]

--===============3509615905221045900==--

---

From: Simon Lachlan via Healeys <[email-masked]>
Date: Fri, 19 Sep 2025 13:33:25 +0100

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I recall, from ages ago, my Ford Granada=E2=80=99s fan. It had some sort =
of internal thermostat in its hub which allowed it to freewheel when the =
engine=E2=80=99s temperature was OK and which engaged when the =
temperature rose too much. I don=E2=80=99t recall that one could adjust =
it but it worked fine in that car. Those cars had a nice 3litre V6 and =
went very well. If you=E2=80=99ve ever watched an old British cop show, =
The Sweeney, they were apparently much beloved by London=E2=80=99s =
police =E2=80=9CFlying Squad=E2=80=9D. Cockney rhyming =
slang=E2=80=A6.Squad to Todd  as in the demon barber of Fleet Street. =
Seemed to me that the Flying Squad was not much better than said barber.

So=E2=80=A6=E2=80=A6.has anyone tried this type of fan on a Healey??

Simon

=20

From: Healeys <[email-masked]> On Behalf Of m.g.sharp--- =
via Healeys
Sent: 19 September 2025 12:58
To: 'Leonard Hartnett' <[email-masked]>; 'Healeys at Autox' =
<[email-masked]>
Subject: Re: [Healeys] radiator thermostat

=20

=20

Mirek

=20

From: Healeys <[email-masked] =
Sent: September 19, 2025 1:24 AM
To: Healeys at Autox <[email-masked] =
Subject: Re: [Healeys] radiator thermostat

=20

=20

=20

=20

=20

=20

              The Other Len

               225,936 miles

=20

=20

  _____ =20

=20

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<html xmlns:v=3D"urn:schemas-microsoft-com:vml" =
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http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8"><meta =
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</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body bgcolor=3Dwhite =
lang=3DEN-GB link=3Dblue vlink=3Dpurple =
style=3D'word-wrap:break-word'><div class=3DWordSection1><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>I recall, =
from ages ago, my Ford Granada=E2=80=99s fan. It had some sort of =
internal thermostat in its hub which allowed it to freewheel when the =
engine=E2=80=99s temperature was OK and which engaged when the =
temperature rose too much. I don=E2=80=99t recall that one could adjust =
it but it worked fine in that car. Those cars had a nice 3litre V6 and =
went very well. If you=E2=80=99ve ever watched an old British cop show, =
The Sweeney, they were apparently much beloved by London=E2=80=99s =
police =E2=80=9CFlying Squad=E2=80=9D. Cockney rhyming =
slang=E2=80=A6.Squad to Todd=C2=A0 as in the demon barber of Fleet =
Street. Seemed to me that the Flying Squad was not much better than said =
barber.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>So=E2=80=A6=E2=80=A6.has anyone =
tried this type of fan on a Healey??<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>Simon<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div><di=
v style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm;font-size:pt'><p class=3DMsoNormal><b><span =
style=3D'font-family:"Calibri",sans-serif'>From:</span></b><span =
style=3D'font-family:"Calibri",sans-serif'> Healeys =
&lt;[email-masked]&gt; <b>On Behalf Of </b>m.g.sharp--- =
via Healeys<br><b>Sent:</b> 19 September 2025 12:58<br><b>To:</b> =
'Leonard Hartnett' &lt;[email-masked]&gt;; 'Healeys at =
Autox' &lt;[email-masked]&gt;<br><b>Subject:</b> Re: [Healeys] =
radiator thermostat<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
lang=3DEN-CA =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'>Interesting Len.&nbsp; The previous owner of my BT7, =
Fergus Ross, who owned it for 14 years, would sometimes vacation on Long =
Island, driving the Healey with his lovely wife, Ava-Marie, from =
Oakville in Ontario.&nbsp; About a 12-14 hour drive.&nbsp; He told me he =
used to remove the fan on the long journey as he got a bit more =
power.&nbsp; I though it a bit extreme as I never felt I needed more =
power in the Healey.&nbsp; I seem to recall (i.e., I am not motivated to =
look it up to confirm) in his wonderful book about Bristols, L.J.K. =
Setright noted that Bristol experimented with different fans on a =
dynamometer and running sans fan produced about 5 extra =
BHP.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-CA =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-CA =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'>Mirek<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-CA =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-la=
nguage:EN-US'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> Healeys =
&lt;<a =
href=3D"mailto:[email-masked]">[email-masked]=
.net</a>&gt; <b>On Behalf Of </b>Leonard Hartnett<br><b>Sent:</b> =
September 19, 2025 1:24 AM<br><b>To:</b> Healeys at Autox &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>&gt;<br>=
<b>Subject:</b> Re: [Healeys] radiator =
thermostat<o:p></o:p></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-CA><o:p>&nbsp;</o:p></span></p><div><p class=3DMsoNormal><span =
lang=3DEN-CA style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>I =
purchased my Healey while stationed at RAF Bentwaters in England about =
80 miles northeast of London and about&nbsp;10 miles from the English =
Channel.&nbsp;&nbsp;The average annual temperature&nbsp;at =
Bentwaters&nbsp;is 46&nbsp; to 72 degrees F.&nbsp; </span><span =
lang=3DEN-CA><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-CA>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-CA =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>Perhaps =
because the temperature was relativaly cool AND the fan was so noisey, I =
removed it.&nbsp; I found that as long as I could keep moving, the =
engine did not overheat.&nbsp; I was not in a heavely populated =
area&nbsp;that involved&nbsp;a lot of&nbsp;stop and go traffic or long =
idles.&nbsp; Back to the US and the Sacramento Valley area, the =
fan&nbsp;had to be&nbsp;reinstalled.</span><span =
lang=3DEN-CA><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-CA>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-CA =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>Returning from =
a meet on Vancouver Island, the fan threw a blade in Washington..&nbsp; =
It did some major damage to the radiator.&nbsp; We were able to get the =
damaged tubes soldered closed and drove home with the damaged radiator =
and without the fan.&nbsp; Mostly Interstate, thank goodness.&nbsp; Made =
it home successfully.</span><span =
lang=3DEN-CA><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-CA>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-CA =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>I tried an =
electric fan alone but it was not successful.&nbsp; I left it installed =
but put&nbsp;the engine fan back on..&nbsp;&nbsp;The electrec fan is =
thermostatically controlled and only comes on when the temp rises.&nbsp; =
I do not know what that temp is but I think it is about 180 =
degrees.&nbsp;&nbsp; Some have suggested that mounting an eletric fan =
blocks the radiator.&nbsp; I have not found it to be a =
problem.&nbsp;</span><span =
lang=3DEN-CA><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-CA>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-CA =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>Double your =
pleasure, double your fun (Doublemint Gum)&nbsp;</span><span =
lang=3DEN-CA><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-CA>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-CA =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The =
Other Len<br>1967 Austin-Healey 3000 MkIII =
BJ8<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; HBJ8L39031</span><span =
lang=3DEN-CA><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-CA =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
225,936 miles</span><span =
lang=3DEN-CA><o:p></o:p></span></p></div><blockquote =
style=3D'border:none;border-left:solid black 1.5pt;padding:0cm 0cm 0cm =
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From: David Nock via Healeys <[email-masked]>
Date: Fri, 19 Sep 2025 09:27:21 -0700

This is a multi-part message in MIME format.
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If you are using the original style Bellow thermostat be sure that you 
DO NOT use a higher pressure radiator cap. If you run a bellow 
thermostat and a higher pressure cap the excess pressure will close the 
thermostat once the cooling system gets up to temperature. Causing the 
engine to overheat.

On 9/18/2025 1:15 PM, Simon Lachlan wrote:
> Hi,
> The original sleeved ones are - I think - easier to find in the UK. 
> Certainly, I managed to find a few. I was advised that the Morgan 
> people were a good source. I bought mine on eBay but that was a while 
> ago. Simon
> Sent from my iPhone
>
>> On 18 Sep 2025, at 18:54, Harold Manifold <[email-masked]> wrote:
>>
>> 
>> Hi All,
>>
>> Thermostats and Healey cooling always generate interesting 
>> discussions, and I'd like to clarify my previous comments on what 
>> controls (or often doesn't control) the coolant temperature.
>>
>> To summarize some of the points made: Coolant flows down the 
>> radiator, out the bottom hose, and into the water pump. It's then 
>> pumped into the engine block's cooling jacket. The goal is to direct 
>> the coolest fluid to the hottest part of the engine for optimal heat 
>> transfer (i.e., the largest delta T). The coolant, having absorbed 
>> heat, then moves up to the cylinder head, through the thermostat, and 
>> back to the radiator. This process is known as thermosiphoning, where 
>> heated coolant rises through the engine and falls as it cools in the 
>> radiator.
>>
>> The heat generated by the engine is a function of the combustion 
>> process (timing, carburation, etc.) and horsepower efficiency loss. 
>> More horsepower output means more heat transferred to the coolant. 
>> The radiator removes this heat, but its effectiveness is proportional 
>> to the difference between the air and coolant temperatures.
>>
>> temperature plus 20 degrees, the thermostat will slightly close to 
>> restrict flow to the radiator. In this scenario, the thermostat is 
>> actively controlling the coolant temperature. However, if the coolant 
>> temperature exceeds 20 degrees above the thermostat's opening 
>> temperature, then the coolant temperature is primarily a function of 
>> the incoming air temperature, and the thermostat is no longer a 
>> factor. In such cases, the coolant temperature is effectively 
>> uncontrolled by the thermostat.
>>
>> On Thu, Sep 18, 2025 at 8:46 AM David Nock via Healeys 
>>     The thermostat does not control the high end temperature of the
>>     temperature is controlled by the radiator, radiator fan and air flow.
>>
>>     On the 6 cylinder engine there is a sleeve attached to the
>>     block the bypass allowing ALL the coolant to flow thru the radiator.
>>
>>     David Nock
>>
>>     British Car Specialists
>>
>>
>>>>     On Wednesday, September 17, 2025, 2:50 PM, Richard Antal via
>>>>     Healeys <[email-masked]>
>>>>
>>>>         Gents,
>>>>              What is the desired coolant temperature for optimal
>>>>         engine performance? I've searched the tech articles and can
>>>>         find nothing that specifically answers that question. This
>>>>         summer my BJ8 seemed to run fine with a 160 thermostat
>>>>         which, according to the gauge which I've checked and found
>>>>         to be accurate, kept the coolant at around 165. Thanks to
>>>>         all who respond.
>>>>         rich antal
>>     www.britishcarspecialists.com <http://www.britishcarspecialists.com>
>>
>> http://autox.team.net/mailman/options/healeys/[email-masked]
>>

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    <p>If you are using the original style Bellow thermostat be sure
      that you DO NOT use a higher pressure radiator cap. If you run a
      bellow thermostat and a higher pressure cap the excess pressure
      will close the thermostat once the cooling system gets up to
      temperature. Causing the engine to overheat.</p>
    <p><br>
    </p>
    <p><br>
    </p>
    <div class="moz-cite-prefix">On 9/18/2025 1:15 PM, Simon Lachlan
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:[email-masked]">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      Hi, 
      <div>The original sleeved ones are - I think - easier to find in
        the UK. Certainly, I managed to find a few. I was advised that
        the Morgan people were a good source. I bought mine on eBay but
        that was a while ago. Simon<br
          id="lineBreakAtBeginningOfSignature">
        <div dir="ltr">Sent from my iPhone</div>
        <div dir="ltr"><br>
          <blockquote type="cite">On 18 Sep 2025, at 18:54, Harold
            Manifold <a class="moz-txt-link-rfc2396E" href="mailto:[email-masked]">&lt;[email-masked]&gt;</a> wrote:<br>
            <br>
          </blockquote>
        </div>
        <blockquote type="cite">
          <div dir="ltr">
            <div dir="ltr">
              <div>Hi All,</div>
              <div><br>
              </div>
              <div>Thermostats and Healey cooling always generate
                interesting discussions, and I'd like to clarify my
                previous comments on what controls (or often doesn't
                control) the coolant temperature.</div>
              <div><br>
              </div>
              <div>To summarize some of the points made: Coolant flows
                down the radiator, out the bottom hose, and into the
                water pump. It's then pumped into the engine block's
                cooling jacket. The goal is to direct the coolest fluid
                to the hottest part of the engine for optimal heat
                transfer (i.e., the largest delta T). The coolant,
                having absorbed heat, then moves up to the cylinder
                head, through the thermostat, and back to the radiator.
                This process is known as thermosiphoning, where heated
                coolant rises through the engine and falls as it cools
                in the radiator.</div>
              <div><br>
              </div>
              <div>The heat generated by the engine is a function of the
                combustion process (timing, carburation, etc.) and
                horsepower efficiency loss. More horsepower output means
                more heat transferred to the coolant. The radiator
                removes this heat, but its effectiveness is proportional
                to the difference between the air and coolant
                temperatures.</div>
              <div><br>
              </div>
              <div>Assuming the radiator has sufficient capacity to
                remove heat, if the coolant temperature the thermostat
                "sees" is less than its opening temperature plus 20
                degrees, the thermostat will slightly close to restrict
                flow to the radiator. In this scenario, the thermostat
                is actively controlling the coolant temperature.
                However, if the coolant temperature exceeds 20 degrees
                above the thermostat's opening temperature, then the
                coolant temperature is primarily a function of the
                incoming air temperature, and the thermostat is no
                longer a factor. In such cases, the coolant temperature
                is effectively uncontrolled by the thermostat.</div>
              <div><br>
              </div>
              <div>To add to the discussion, the engine fan has minimal
                effect at speeds greater than 15 miles per hour.</div>
              <div><br>
              </div>
              <div>Harold</div>
            </div>
            <br>
            <div class="gmail_quote gmail_quote_container">
              <div dir="ltr" class="gmail_attr">On Thu, Sep 18, 2025 at
                8:46 AM David Nock via Healeys &lt;<a
                  href="mailto:[email-masked]"
                  moz-do-not-send="true" class="moz-txt-link-freetext">[email-masked]</a>&gt;
                wrote:<br>
              </div>
              <blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
                <div style="padding-bottom:1px">
                  <p>The thermostat does not control the high end
                    temperature of the engine. Its job is to get the
                    engine up to an operating temperature as soon as
                    possible. Then in maintains the low end temperature
                    of the engine. Once the thermostat is open the
                    engine temperature is controlled by the radiator,
                    radiator fan and air flow.</p>
                  <p>On the 6 cylinder engine there is a sleeve attached
                    to the thermostat, that blocks off a bypass in the
                    cylinder head. The bypass is there to allow the
                    coolant to flow when the thermostat is closed. Once
                    the thermostat is open the sleeve is there to block
                    the bypass allowing ALL the coolant to flow thru the
                    radiator. </p>
                  <p>David Nock</p>
                  <p>British Car Specialists</p>
                  <p><br>
                  </p>
                  <div>On 9/17/2025 12:54 PM, Richard Mayor wrote:<br>
                  </div>
                  <blockquote type="cite"> 165 is too cold for good
                    running.  Our engines run better in the 180 to 190
                    range.  
                    <div> </div>
                    <div><br>
                      <div>
                        <div dir="ltr">Sent from my iPad</div>
                        <div dir="ltr"><br>
                          <blockquote type="cite">On Sep 17, 2025, at
                            12:13 PM, Robert Markovich via Healeys <a
                              href="mailto:[email-masked]"
                              target="_blank" moz-do-not-send="true">&lt;[email-masked]&gt;</a>
                            wrote:<br>
                            <br>
                          </blockquote>
                        </div>
                        <blockquote type="cite">
                          <div dir="ltr"> 165 is the one I use<br>
                            <br>
                            <br>
                            <div><a style="font-size:12px"
href="https://aolapp.onelink.me/eG2g?pid=NativePlacement&amp;c=US_Acquisition_YMktg_320_EmailSignature_AttributionDL&amp;af_sub1=Acquisition&amp;af_sub2=US_YMktg&amp;af_sub3=&amp;af_sub4=100002473&amp;af_sub5=SentFromNewAOLApp__Interstitial_&amp;af_ios_store_cpp=ce85ce34-ad0f-4811-a92b-a172743b064e&amp;af_android_url=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Demail_signature_attribution"
                                target="_blank" moz-do-not-send="true">Sent
                                from the all new AOL app for iOS</a><br>
                            </div>
                            <br>
                            <p
style="font-size:15px;color:rgb(132,115,255);padding-top:15px;margin-top:0px">On
                              Wednesday, September 17, 2025, 2:50 PM,
                              Richard Antal via Healeys <a
                                href="mailto:[email-masked]"
                                target="_blank" moz-do-not-send="true">&lt;[email-masked]&gt;</a>
                              wrote:</p>
                            <blockquote>
                              <div
                                id="m_2673071501772592614yiv6324880639">
                                <div>
                                  <div
style="font-family:&quot;Helvetica Neue&quot;,Helvetica,Arial,sans-serif;font-size:13px">
                                    <div dir="ltr">Gents,</div>
                                    <div dir="ltr">     What is the
                                      desired coolant temperature for
                                      optimal engine performance? I've
                                      searched the tech articles and can
                                      find nothing that specifically
                                      answers that question. This summer
                                      my BJ8 seemed to run fine with a
                                      160 thermostat which, according to
                                      the gauge which I've checked and
                                      found to be accurate, kept the
                                      coolant at around 165. Thanks to
                                      all who respond.</div>
                                    <div dir="ltr">rich antal</div>
                                  </div>
                                </div>
                              </div>
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                  <pre cols="72">-- 
David Nock
British Car Specialists
Stockton Ca  
209 948 8767
<a href="http://www.britishcarspecialists.com" target="_blank"
                  moz-do-not-send="true">www.britishcarspecialists.com</a></pre>
                </div>
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    <pre class="moz-signature" cols="72">-- 
David Nock
British Car Specialists
Stockton Ca  
209 948 8767
<a class="moz-txt-link-abbreviated" href="http://www.britishcarspecialists.com">www.britishcarspecialists.com</a></pre>
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[email-masked]

--===============2654774101294280222==--

---

From: Simon Lachlan via Healeys <[email-masked]>
Date: Fri, 19 Sep 2025 20:26:25 +0100

--===============7870054954600137032==
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Alright so far. 25 years or so=E2=80=A6=E2=80=A6=E2=80=A6=E2=80=A6..

=20

From: David Nock <[email-masked]>=20
Sent: 19 September 2025 17:27
To: Simon Lachlan <[email-masked]>; Harold Manifold =
<[email-masked]>
Cc: Richard Antal <[email-masked]>; Healeys =
<[email-masked]>
Subject: Re: [Healeys] radiator thermostat

=20

If you are using the original style Bellow thermostat be sure that you =
DO NOT use a higher pressure radiator cap. If you run a bellow =
thermostat and a higher pressure cap the excess pressure will close the =
thermostat once the cooling system gets up to temperature. Causing the =
engine to overheat.

=20

=20

Hi, =20

The original sleeved ones are - I think - easier to find in the UK. =
Certainly, I managed to find a few. I was advised that the Morgan people =
were a good source. I bought mine on eBay but that was a while ago. =
Simon

Sent from my iPhone

<[email-masked]> wrote:

=EF=BB=BF=20

Hi All,

=20

Thermostats and Healey cooling always generate interesting discussions, =
and I'd like to clarify my previous comments on what controls (or often =
doesn't control) the coolant temperature.

=20

To summarize some of the points made: Coolant flows down the radiator, =
out the bottom hose, and into the water pump. It's then pumped into the =
engine block's cooling jacket. The goal is to direct the coolest fluid =
to the hottest part of the engine for optimal heat transfer (i.e., the =
largest delta T). The coolant, having absorbed heat, then moves up to =
the cylinder head, through the thermostat, and back to the radiator. =
This process is known as thermosiphoning, where heated coolant rises =
through the engine and falls as it cools in the radiator.

=20

The heat generated by the engine is a function of the combustion process =
(timing, carburation, etc.) and horsepower efficiency loss. More =
horsepower output means more heat transferred to the coolant. The =
radiator removes this heat, but its effectiveness is proportional to the =
difference between the air and coolant temperatures.

=20

Assuming the radiator has sufficient capacity to remove heat, if the =
coolant temperature the thermostat "sees" is less than its opening =
temperature plus 20 degrees, the thermostat will slightly close to =
restrict flow to the radiator. In this scenario, the thermostat is =
actively controlling the coolant temperature. However, if the coolant =
temperature exceeds 20 degrees above the thermostat's opening =
temperature, then the coolant temperature is primarily a function of the =
incoming air temperature, and the thermostat is no longer a factor. In =
such cases, the coolant temperature is effectively uncontrolled by the =
thermostat.

=20

To add to the discussion, the engine fan has minimal effect at speeds =
greater than 15 miles per hour.

=20

Harold

=20

On Thu, Sep 18, 2025 at 8:46=E2=80=AFAM David Nock via Healeys =

David Nock

British Car Specialists

=20

=20

=20

Sent from my iPad

 =
aol.mobile.aolapp%26listing%3Demail_signature_attribution> Sent from =

=20

Gents,

rich antal

--=20
David Nock
British Car Specialists
Stockton Ca =20
209 948 8767

http://autox.team.net/mailman/options/healeys/[email-masked]=
us.com

--=20
David Nock
British Car Specialists
Stockton Ca =20
209 948 8767

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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-GB link=3Dblue =
vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>Alright so far. 25 years or =
so=E2=80=A6=E2=80=A6=E2=80=A6=E2=80=A6..<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div><di=
v style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm;font-size:pt'><p class=3DMsoNormal><b><span =
style=3D'font-family:"Calibri",sans-serif'>From:</span></b><span =
style=3D'font-family:"Calibri",sans-serif'> David Nock =
&lt;[email-masked]&gt; <br><b>Sent:</b> 19 September 2025 =
17:27<br><b>To:</b> Simon Lachlan =
&lt;[email-masked]&gt;; Harold Manifold =
&lt;[email-masked]&gt;<br><b>Cc:</b> Richard Antal =
&lt;[email-masked]&gt;; Healeys =
&lt;[email-masked]&gt;<br><b>Subject:</b> Re: [Healeys] radiator =
thermostat<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p>If you are using the original =
style Bellow thermostat be sure that you DO NOT use a higher pressure =
radiator cap. If you run a bellow thermostat and a higher pressure cap =
the excess pressure will close the thermostat once the cooling system =
gets up to temperature. Causing the engine to =
overheat.<o:p></o:p></p><p><o:p>&nbsp;</o:p></p><p><o:p>&nbsp;</o:p></p><=
div><p class=3DMsoNormal>On 9/18/2025 1:15 PM, Simon Lachlan =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p =
class=3DMsoNormal>Hi,&nbsp; <o:p></o:p></p><div><p class=3DMsoNormal>The =
original sleeved ones are - I think - easier to find in the UK. =
Certainly, I managed to find a few. I was advised that the Morgan people =
were a good source. I bought mine on eBay but that was a while ago. =
Simon<o:p></o:p></p><div><p class=3DMsoNormal>Sent from my =
iPhone<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>On 18 Sep 2025, at 18:54, Harold Manifold =
<a href=3D"mailto:[email-masked]">&lt;[email-masked]&gt;</a> =
wrote:<o:p></o:p></p></blockquote></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p =
class=3DMsoNormal><span =
style=3D'font-family:"Tahoma",sans-serif'>=EF=BB=BF</span> =
<o:p></o:p></p><div><div><p class=3DMsoNormal>Hi =
All,<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Thermostats and Healey cooling always generate =
interesting discussions, and I'd like to clarify my previous comments on =
what controls (or often doesn't control) the coolant =
temperature.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>To summarize some of the points made: Coolant flows =
down the radiator, out the bottom hose, and into the water pump. It's =
then pumped into the engine block's cooling jacket. The goal is to =
direct the coolest fluid to the hottest part of the engine for optimal =
heat transfer (i.e., the largest delta T). The coolant, having absorbed =
heat, then moves up to the cylinder head, through the thermostat, and =
back to the radiator. This process is known as thermosiphoning, where =
heated coolant rises through the engine and falls as it cools in the =
radiator.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>The heat generated by the engine is a function of the =
combustion process (timing, carburation, etc.) and horsepower efficiency =
loss. More horsepower output means more heat transferred to the coolant. =
The radiator removes this heat, but its effectiveness is proportional to =
the difference between the air and coolant =
temperatures.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Assuming the radiator has sufficient capacity to =
remove heat, if the coolant temperature the thermostat &quot;sees&quot; =
is less than its opening temperature plus 20 degrees, the thermostat =
will slightly close to restrict flow to the radiator. In this scenario, =
the thermostat is actively controlling the coolant temperature. However, =
if the coolant temperature exceeds 20 degrees above the thermostat's =
opening temperature, then the coolant temperature is primarily a =
function of the incoming air temperature, and the thermostat is no =
longer a factor. In such cases, the coolant temperature is effectively =
uncontrolled by the thermostat.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>To add to the discussion, the engine fan has minimal =
effect at speeds greater than 15 miles per =
hour.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Harold<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>On =
Thu, Sep 18, 2025 at 8:46<span =
style=3D'font-family:"Arial",sans-serif'>=E2=80=AF</span>AM David Nock =
via Healeys &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><p>The thermostat does =
not control the high end temperature of the engine. Its job is to get =
the engine up to an operating temperature as soon as possible. Then in =
maintains the low end temperature of the engine. Once the thermostat is =
open the engine temperature is controlled by the radiator, radiator fan =
and air flow.<o:p></o:p></p><p>On the 6 cylinder engine there is a =
sleeve attached to the thermostat, that blocks off a bypass in the =
cylinder head. The bypass is there to allow the coolant to flow when the =
thermostat is closed. Once the thermostat is open the sleeve is there to =
block the bypass allowing ALL the coolant to flow thru the =
radiator.&nbsp;<o:p></o:p></p><p>David Nock<o:p></o:p></p><p>British Car =
Specialists<o:p></o:p></p><p><o:p>&nbsp;</o:p></p><div><p =
class=3DMsoNormal>On 9/17/2025 12:54 PM, Richard Mayor =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal>165 =
is too cold for good running.&nbsp; Our engines run better in the 180 to =
190 range. &nbsp; <o:p></o:p></p><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>Sent from my iPad<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>On Sep 17, 2025, at 12:13<span =
style=3D'font-family:"Arial",sans-serif'>=E2=80=AF</span>PM, Robert =
Markovich via Healeys <a href=3D"mailto:[email-masked]" =
target=3D"_blank">&lt;[email-masked]&gt;</a> =
wrote:<o:p></o:p></p></blockquote></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span =
style=3D'font-family:"Tahoma",sans-serif'>=EF=BB=BF</span> 165 is the =
one I use<br><br><o:p></o:p></p><div><p class=3DMsoNormal><a =
href=3D"https://aolapp.onelink.me/eG2g?pid=3DNativePlacement&amp;c=3DUS_A=
cquisition_YMktg_320_EmailSignature_AttributionDL&amp;af_sub1=3DAcquisiti=
on&amp;af_sub2=3DUS_YMktg&amp;af_sub3=3D&amp;af_sub4=3D100002473&amp;af_s=
ub5=3DSentFromNewAOLApp__Interstitial_&amp;af_ios_store_cpp=3Dce85ce34-ad=
0f-4811-a92b-a172743b064e&amp;af_android_url=3Dhttps%3A%2F%2Fplay.google.=
com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Dema=
il_signature_attribution" target=3D"_blank"><span =
style=3D'font-size:9.0pt'>Sent from the all new AOL app for =
iOS</span></a><o:p></o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p style=3D'margin-top:0cm'><span =
style=3D'font-size:11.5pt;color:#8473FF'>On Wednesday, September 17, =
2025, 2:50 PM, Richard Antal via Healeys <a =
href=3D"mailto:[email-masked]" =
target=3D"_blank">&lt;[email-masked]&gt;</a> =
wrote:<o:p></o:p></span></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div =
id=3D"m_2673071501772592614yiv6324880639"><div><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif'>Gents,<o:p>=
</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif'>&nbsp; =
&nbsp; &nbsp;What is the desired coolant temperature for optimal engine =
performance? I've searched the tech articles and can find nothing that =
specifically answers that question. This summer my BJ8 seemed to run =
fine with a 160 thermostat which, according to the gauge which I've =
checked and found to be accurate, kept the coolant at around 165. Thanks =
to all who respond.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif'>rich =
antal<o:p></o:p></span></p></div></div></div></div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br>Support Team.Net <a href=3D"http://www.team.net/donate.html" =
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$12.75<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>Archive: <a =
href=3D"http://www.team.net/pipermail/healeys" =
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re><pre><o:p>&nbsp;</o:p></pre><pre><a =
href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a><o:p></o:p></pre><pre><a =
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target=3D"_blank">http://autox.team.net/mailman/listinfo/healeys</a><o:p>=
</o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>Unsubscribe/Manage: <a =
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@sbcglobal.net</a><o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre></blockquo=
te><pre>-- <o:p></o:p></pre><pre>David Nock<o:p></o:p></pre><pre>British =
Car Specialists<o:p></o:p></pre><pre>Stockton Ca=C2=A0 =
<o:p></o:p></pre><pre>209 948 8767<o:p></o:p></pre><pre><a =
href=3D"http://www.britishcarspecialists.com" =
target=3D"_blank">www.britishcarspecialists.com</a><o:p></o:p></pre></div=
><p class=3DMsoNormal =
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quote><pre>-- <o:p></o:p></pre><pre>David =
Nock<o:p></o:p></pre><pre>British Car =
Specialists<o:p></o:p></pre><pre>Stockton Ca=C2=A0 =
<o:p></o:p></pre><pre>209 948 8767<o:p></o:p></pre><pre><a =
href=3D"http://www.britishcarspecialists.com">www.britishcarspecialists.c=
om</a><o:p></o:p></pre></div></body></html>
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[email-masked]

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