Hello, I am currently doing a project on reciprocating compressed air engine and would like to have explanations about the mechanical design - is it similar to a reciprocating air compressor or steam engine, that is, does it have a conventional piston-cylinder assembly, connecting rod, crankshaft? How different is an air motor from an internal combustion engine? How about the valves? Can we adapt a mushroom valve operated by cams and camshaft as used in an internal combustion engine? Lastly, what is the diagram factor of the hypothetical P-V diagram for air motors - is it similar to steam engine?