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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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