*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)

 Self-pressurizing.  Start out with system full and coolant in the
overflow bottle.  Let the coolant expand and dump excess overboard.  Air
will draw back into the overflow bottle on cool-down.  Subsequent
expansion will compress the air. Of course the line from the main system
'overflow' must go to the bottom of the overflow bottle so the system
will exchange coolant with the overflow bottle on temp cycles.

Al

 
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