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The myth won't die because there is a time component to heat conduction. The longer the coolant is in contact with the hot metals of the head and block, the higher the water temperature will rise to approximate the metal temperature. Achieving a maximum rise in coolant temperature is key to...

It may be a myth, but if you consider the second heat transfer (dissipation) occurring at the radiator, you may find the concept is still valid. The heated coolant must have sufficient time in the air stream to shed heat into the atmosphere. Therefore velocity may cause a gradual heat...