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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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