Hi Stu,
The coolant pressure has more effect on boiling point than the glycol
concentration.
http://avenger-valkyrie.org/techinfo/antifreeze.htm
This is why a higher pressure radiator cap is effective in solving some of the
Tiger's cooling ills... but you have to be careful that you don't have a
heater core blowout. The heater core box ends are not well braced for high
pressures. Another approach is to replumb the cooling system so the radiator
cap is situated on the water pump inlet side; you gain system pressure
corresponding to whatever would be lost across the radiator core. Still,
higher pressure is higher pressure, and the heater may not like it.
Cheers,
Theo
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