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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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