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Originally Posted by bobkoure
PS: Yes automotive sytems are pressurized a bit, but this is simply to raise the boiling point of the coolant, not to make the system more efficient at thermal transfer.
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Yes that is right. Most automotive cooling systems have a radiator cap rated between 13-16psi. For every 1 psi. you add to a sealed system you increase the boiling point by 3 degrees. So if water boils at 100 degree celsius and you add 15 psi to it, than the boiling point will be 145 degrees celsius.
Actually I'm working on a Waterblock that has a 1/2" barb inlet and then splits into 7, 3/16" orifices to increase pressure at the core.