In the realm of an air-cooled engine where the oil is picking a whole order of magnitude greater heat from the parts it has been assigned to cool as well as lubricate, the "excess flow causing heat" theory is swallowed up by piston crown heat transfer, connecting rod heat transfer from the pistons as well as the shear heat at the journals and the shear heat at the main bearing journals. So there is a point where extra flow may cause heat but is more than taken away by the extra cooling provided by that flow through the oil cooler. At some other point, I give up thinking about it and go outside.vdubyah73 wrote:Pumping oil thru a positive displacement pump, against a pressure head, definitely heats oil up. You can't leave your hand on a hydraulic line, of a hard working piece of equipment for very long, without yanking it away rapidly. Whether it's driven by engine or motor. The Bigger the pump the more heat.
Colin
