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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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