02-14-2008, 02:25 PM
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Join Date: Jun 2005
Cobra Make, Engine:
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An oil pump in a car is a positive displacement gear pump. This means it pumps the same volume of oil regardless of the temperature or pressure. When the temperature is cold, the oil is thicker so the pump discharge pressure is higher but the flowrate is exactly the same as when the engine is warm and the oil pressure is lower. Do not confuse centrifugal style pumps with positive displacement. You get the same oil flow cold as hot. |
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