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Quote:
Originally Posted by DMMuir
I was thinking the pressure may help it run a bit cooler, but that's a no.
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Increasing the pressure in the cooling system does not help with lowering the coolant temperature, it raises the temperature at which the water will boil. That allows you to operate the engine at a higher temperature, which has a lot of benefits. But it will be running at a higher temperature, so no help if you are trying to lower the operating temperature. Flowing coolant continues to remove heat from the internal metal surfaces until it reaches it's boiling point. Once the coolant is boiling it's ability to transfer the heat from the metal surfaces is greatly reduced. The higher the pressure in the coolant the higher temperature it can run at until it reaches it boiling point.
The older Ford v8 radiators were not designed for pressure systems and will not tolerate much.