Teddy, ultimately ALL energy applied to an engine can be accounted for. If it doesn't come out as useful energy (e.g shaft horsepower), then it has to go someplace and usually it is rejected as heat. That's true with an electric motor (which gets hot), an internal combustion engine (which rejects energy through its cooling system) or a steam engine (which rejects energy by condensing steam to water).
The definition of efficiency is the USEFUL energy out of a system divided by the energy into the system. For an engine to have an efficiency greater than one, it must generate output power greater than input power, even after any losses due to rejected heat. And the laws of thermodynamics tell us that's not possible.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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