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Original inquiry was whether I should use a 4lb or 7lb cap for my BN2.
The 15-pounder came out of the blue; guess my inquiry could have been a
bit clearer (I think some thought I wanted to use 'a' higher pressure
rather than 'the' higher of the two, 4 or 7).
Anyway, I've ordered a 7psi cap.
bs
On 7/18/2022 11:58 AM, Michael Oritt wrote:
> If the inquiry is prompted by seeking to increase water's boiling
> point then according to EngineeringToolbox.com 15 psi only raises it
> to 213 degrees, so little if nothing is gained at the risk of damaging
> the cooling system.
>
> Best--Michael Oritt
>
> On Mon, Jul 18, 2022 at 2:03 PM Henry G Leach via Healeys
> <healeys@autox.team.net> wrote:
>
> Ok-at least three reasons to not go higher than 7 lbs.:
>
> 1- Weak link heater core element
> 2- Spring rate in water pump at max
> 3- freeze plugs will pop under higher pressure
>
> Consider the precarious condition of the 100 head gasket and the
> fact that 7lbs. will keep a properly maintained cooling system at
> functional temperature...and the book says use 7lbs., so the
> conclusion is stick to the specs supplied by the manufacturer.
>
> Keep the 15lb. caps on cars specified for their use (like most US)
> and don't let your 100 overheat due to poor cooling system
> maintainece. That should make up your mind Bob, as to which cap to
> use. Good input from the field! Hank
>
> -----------------------------------------
>
> From: "Michael Salter"
> To: "john harper"
> Cc: "Hank Leach", "Healeys"
> Sent: Monday July 18 2022 5:11:58AM
> Subject: Re: [Healeys] Radiator cap for BN2
>
> Actually, in my experience, the biggest problem wirh exceeding 7
> p.s.i. is the water pump seal. They will typically start to leak
> at around 10 - 12 p.s.i.
>
> M
>
> On Mon., Jul. 18, 2022, 6:04 a.m. john harper,
> <ah100tech@gmail.com> wrote:
>
> Henry
>
> I would not use a cap higher than 7psi because of core plugs
> as already stated but because the heater core on the BN1/2 may
> not stand the higher pressure.
>
> On Mon, 18 Jul 2022 at 03:11, Henry G Leach via Healeys
> <healeys@autox.team.net> wrote:
>
> Oh, yea! I recommend do not use a 15 lb. cap-worked on a
> 100-6 with blown freeze plugs as a result of the
> 15pounder. Early 100s used a 4 lb. cap, but the later
> (BN2) cars went to 7 lb. (each additional pound gives
> higher temp tolerance, but too much of a good thing is
> bad. There is always the head gasket to consider as well.Â
> Hank
>
> -----------------------------------------
>
> From: "Bob Spidell"
> To: "Healeys"
> Cc:
> Sent: Sunday July 17 2022 6:27:46PM
> Subject: [Healeys] Radiator cap for BN2
>
> I see both 4psi and 7psi mentioned; any issues going with
> the higher
> pressure cap?
>
> TIA
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Original inquiry was whether I should use a 4lb or 7lb cap for my
BN2. The 15-pounder came out of the blue; guess my inquiry could
have been a bit clearer (I think some thought I wanted to use 'a'
higher pressure rather than 'the' higher of the two, 4 or 7).<br>
<br>
Anyway, I've ordered a 7psi cap.<br>
<br>
bs<br>
<br>
<div class="moz-cite-prefix">On 7/18/2022 11:58 AM, Michael Oritt
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAPTa0B7XCqysnXqJP2YyOyydHag2GyOUzFbozEfOdkwZX=m10g@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div class="gmail_default" style="color:#3333ff">If the inquiry
is prompted by seeking to increase water's boiling point
then according to EngineeringToolbox.com 15 psi only raises it
to 213 degrees, so little if nothing is gained at the risk of
damaging the cooling system.</div>
<div class="gmail_default" style="color:#3333ff"><br>
</div>
<div class="gmail_default" style="color:#3333ff">Best--Michael
Oritt</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Jul 18, 2022 at 2:03
PM Henry G Leach via Healeys <<a
href="mailto:healeys@autox.team.net"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a>>
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>Ok-at least three reasons to not go higher than 7 lbs.:
<div><br>
</div>
<div>1- Weak link heater core element</div>
<div>2- Spring rate in water pump at max</div>
<div>3- freeze plugs will pop under higher pressure</div>
<div><br>
</div>
<div>Consider the precarious condition of the 100 head
gasket and the fact that 7lbs. will keep a properly
maintained cooling system at functional temperature...and
the book says use 7lbs., so the conclusion is stick to the
specs supplied by the manufacturer.</div>
<div><br>
</div>
<div>Keep the 15lb. caps on cars specified for their use
(like most US) and don't let your 100 overheat due to poor
cooling system maintainece. That should make up your mind
Bob, as to which cap to use. Good input from the field!Â
Hank<br>
<br>
<p>-----------------------------------------</p>
From: "Michael Salter" <br>
To: "john harper"<br>
Cc: "Hank Leach", "Healeys"<br>
Sent: Monday July 18 2022 5:11:58AM<br>
Subject: Re: [Healeys] Radiator cap for BN2<br>
<br>
<div>Actually, in my experience, the biggest problem
wirh exceeding 7 p.s.i. is the water pump seal. They
will typically
start to leak at around 10 - 12 p.s.i.
<div><br>
</div>
<div>M</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon., Jul. 18,
2022, 6:04 a.m.
john harper, <<a
moz-do-not-send="true">ah100tech@gmail.com</a>>
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 dir="ltr">Henry
<div><br>
</div>
<div>I would not use a cap higher than 7psi because
of core plugs
as already stated but because the heater core on
the
BN1/2 may not stand the higher pressure.</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, 18 Jul
2022 at 03:11,
Henry G Leach via Healeys <<a
moz-do-not-send="true">healeys@autox.team.net</a>>
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>Oh, yea! I recommend do not use a 15 lb.
cap-worked on a 100-6
with blown freeze plugs as a result of the
15pounder. Early 100s
used a 4 lb. cap, but the later (BN2) cars went
to 7 lb. (each
additional pound gives higher temp tolerance,
but too much of a
good thing is bad. There is always the head
gasket to consider as
well. Hank<br>
<br>
<p>-----------------------------------------</p>
From: "Bob Spidell"<br>
To: "Healeys"<br>
Cc:<br>
Sent: Sunday July 17 2022 6:27:46PM<br>
Subject: [Healeys] Radiator cap for BN2<br>
<br>
I see both 4psi and 7psi mentioned; any issues
going with the
higher<br>
pressure cap?<br>
<br>
TIA<br>
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<pre class="moz-quote-pre"
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