*Use the same basic approach as the first one above, but use a
pressurized overflow container.  Use 20+ psig cap on the coolant system;
15 psig on the overflow (expansion) bottle.  This is the system used the
Jag XJS.  This approach maintains pressure on the system and reduces
pressure fluctuations.  Seems like the best approach to me; just a
little more complicated.  I'm told a number of late model cars use this
idea - something about coolant longevity.

 I had planned the second option above, but am reconsidering.  Seems
good for a car where you don't make large altitude changes; but fly your
plane hard at 15,000' and then drop to 5000' and run at high power and
you won't get full pressure.  So the third approach may be best.

Not having knowledge of these options, I was wondering what you mean by
'pressurised overflow container'.

A container that comes up to pressure with the cooling system and maintains
that pressure with the 15psi cap.
or
A container that you actually pump-up to pressure manually ?
George (down under)

 
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