Mechanical energy extracted by the engine is from pressure due to expanding gasses. Delta P Gasses that are already hot and placed into the engine do not expand. In fact they would contract. The pressure increase Delta P in the engine that does work is when you take cold air and heat it. Work is change. Making hot Delta T pressurized air delta P from cold air at atmospheric pressure requires energy. When that hot pressurized air becomes cooler/lower pressure air. It's giving off energy. The losses in conversion is why 60-70% of the heat in the fuel is lost as heat in a typical engine. Really large combined cycle gas turbines, reciprocating engines and steam boilers. Are really stretching to achieve 50% efficiency.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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