[Healeys] Radiator cap for BN2

gradea1 at charter.net gradea1 at charter.net
Mon Jul 18 11:06:23 MDT 2022


Ok-at least three reasons to not go higher than 7 lbs.:
1- Weak link heater core element2- Spring rate in water pump at max3-
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,  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  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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