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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:1BB88ADA-A551-4291-8BEA-6013F1F9E276@gmail.com">
<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:healeys@autox.team.net"><healeys@autox.team.net></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>
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href="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"
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<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:healeys@autox.team.net"><healeys@autox.team.net></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>
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<pre wrap="" class="moz-quote-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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