09-04-10, 05:53 AM
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Member
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Join Date: May 2008
Location: Melbourne, Australia
Posts: 1,170
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Radiator caps and pressure
Given that pressure has the effect of raising the boiling point of water, if an engine's normal operating temp is say 85-90 degrees Celsius, why does it need a radiator cap rated at 15 psi? - this means the boiling point would be over 120 deg C (at 13psi water boils at 120 deg C)
I can't see any point in pressurising the water system unduly, but there must be a point to it because every car manufacturer does it!
Does anyone actually know the reason for pressurising the water cooling system to 15 psi?
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