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Old Jan 12, 2009, 07:09 AM   #4
SloRice
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There is no formula that says it will be xxx psi when cold and yyy psi when warm.

As for the 40psi increase you said from the motor being warm. When metal gets warm, it expands, thus tightening all the clearances in the motor. That's how it creates more pressure. Simple physics.
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