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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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