Re: [Healeys] Radiator cap for BN2

[Michael Oritt <michael.oritt@gmail.com>]

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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.  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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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">If th=
e inquiry is prompted by seeking to increase water&#39;s boiling point then=
=C2=A0according to EngineeringToolbox.com 15 psi only raises it to 213 degr=
ees, so little if nothing is gained at the risk of damaging the cooling sys=
tem.</div><div class=3D"gmail_default" style=3D"color:#3333ff"><br></div><d=
iv class=3D"gmail_default" style=3D"color:#3333ff">Best--Michael Oritt</div=
></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr"=
>On Mon, Jul 18, 2022 at 2:03 PM Henry G Leach via Healeys &lt;<a href=3D"m=
ailto:healeys@autox.team.net" target=3D"_blank">healeys@autox.team.net</a>&=
gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0=
px 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 function=
al 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&#39;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!=C2=A0=
 Hank<br><br><div></div><p>-----------------------------------------</p>Fro=
m: &quot;Michael Salter&quot; <u></u><br>To: &quot;john harper&quot;<br>Cc:=
 &quot;Hank Leach&quot;, &quot;Healeys&quot;<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=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Mon., Jul. 18, 2022, 6:04 a.m.
john harper, &lt;<a>ah100tech@gmail.com</a>&gt;
wrote:<br></div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir=3D"ltr">Henry
<div><br></div>
<div>I would not use a cap higher than 7psi because of core plugs
as already stated but because=C2=A0the heater=C2=A0core on the
BN1/2 may not stand the higher pressure.</div>
</div>
<br><div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Mon, 18 Jul 2022 at 03:11,
Henry G Leach via Healeys &lt;<a>healeys@autox.team.net</a>&gt; wrote:<br><=
/div>
<blockquote class=3D"gmail_quote" style=3D"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.=C2=A0 Hank<br><br><p>-----------------------------------------</p>
From: &quot;Bob Spidell&quot;<br>
To: &quot;Healeys&quot;<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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