[Healeys] Radiator cap for BN2

Michael Oritt michael.oritt at gmail.com
Mon Jul 18 12:58:09 MDT 2022


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 at 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 at 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 at 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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