[Healeys] Radiator cap for BN2

[Bob Spidell]

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 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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