Yes if you are using one of the bellows style thermostats the higher
pressure will cause the thermostat to close thus causing the engine
temp to rise.
This is why we DO NOT use them in our engines. We have the wax
capsule style thermostat with the sliding sleeve. The bellows style
thermostat is on old school style thermostat.
David Nock
British Car Specialists
Stockton Ca 95205
209-948-8767
www.britishcarspecialists.com
Please feel free to view an interview with the Nock's in 2009
Enjoy
www.youtube.com/watch?v=QOTTRYkbQzs
.
.
On Mar 29, 2013, at 7:33 AM, Oudesluys wrote:
> The higher pressure may perhaps affect the expanding of the bellows
> causing it to open at a higher temperature. This may be why it is
> recommended that a 7lbs rad cap should be used.
> However I have known cars that did not have issues with a 10lbs cap.
> Kees Oudesluijs
>
>
> Op 29-3-2013 15:09, Bob Spidell schreef:
>> Doesn't make sense, at least according to the laws of physics I
>> pretend to understand.
>>
>> If you didn't boil or lose coolant with a 7lb cap, it means you
>> never reached 7lb. pressure in your cooling system. So the 10lb
>> cap should never open, either. The additional 3lbs pressure would
>> only give a few more degrees before boiling, which doesn't appear
>> to be an issue with your car (Law of Physics: the boiling point of
>> a fluid is directly related to ambient pressure; that's why
>> boiling cooks foods slower at higher altitude).
>>
>> IOW, the cap doesn't regulate pressure in the cooling system (like
>> a voltage regulator)--it's there to keep your hoses, etc. from
>> exploding if your engine overheats.
>>
>>
>> Bob
>>
>>
>> On 3/29/2013 6:42 AM, Dan Stromquist wrote:
>>> Water pump issue?
>>>
>>>
>>>
>>> Hi all, about 2 months ago there was a thread indicated that the
>>> correct
>>> radiator cap for a BJ8 was a long neck 10 lb. cap.
>>>
>>> News to me but since a couple agreed, I ordered one to see if
>>> there would be
>>> a difference.
>>>
>>> I have been running a 7 lb. cap with 180 degree sleeved
>>> thermostat. With
>>> this setup, I've had an idle temp right at 180 degrees when
>>> warmed up.
>>>
>>> When I changed to the 10 lb. cap (with same thermostat) the BJ8
>>> immediately
>>> ran 200 - 205 degrees at warm idle. Switching back to the 7 lb.
>>> cap brought
>>> the idle temp right back down to 180 degrees.
>>>
>>> Why would this be?
>>>
>>> Randy
>>>
>>
>
>
> --
> Kees Oudesluijs
> Dorpsstraat 183
> 2995XG Heerjansdam
> T: 078-677 1233
> E: coudesluijs@chello.nl
>
> Technische commissie Jensen Healey en GT
> Het Jensen Genootschap Holland
> www.jensenholland.nl
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