[Healeys] BJ8 radiator cap issue

[Oudesluys]

This is not necessarily correct. If there is little or no air in the 
system the pressure will certainly rise to the limit of the rad cap as 
the water will expand and as it is non-compressable the pressure will 
rise considerably. This is often the case with an airtight rad cap and 
if a expansion vessel is fitted.

If there is a lot of air in the radiator, the pressure will not increase 
a lot as the air will be slightly compressed by the expanding water and 
the increase in temperature.

Kees Oudesluijs
NL


Op 31-3-2013 16:06, warthodson at aol.com schreef:
> David,
> The problem I have with your explanation is that the temperature was 
> never higher that 205 which would mean that the pressure under either 
> cap would have been well below the boiling point. The pressure only 
> climbs after reaching 212F (at standard conditions) & the temp. would 
> have had to be well above 212 to reach the release pressure of the 7 
> Lb cap & even higher for the 10 Lb. cap.
> Gary Hodson
> From: David Nock British Car Specialists healeydoc at sbcglobal.net 
> <mailto:healeydoc at sbcglobal.net>
> 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
>
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> 03/30/13
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-- 
Kees Oudesluijs
Dorpsstraat 183
2995XG Heerjansdam
T: 078-677 1233
E: coudesluijs at chello.nl

Technische commissie Jensen Healey en GT
Het Jensen Genootschap Holland
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