Quote:
Originally Posted by tasdrouille
At least 60% of the energy in an ICE is lost as heat. Thermal losses through the cylinder walls are significant at any rpm but more so at lower rpm.
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True about the heat losses, I dont have the source handy but the majority of the heat lost in a ICE is pumped out of the engine through the exhaust and replaced with cool intake air. The actual losses to the engine coolant is small in comparison. Thats why air cooled engines can exist.