Re: OT- fuel mileage & fuel injection questions


They make power from the expansion of gas when ignited. The mechanical
force on the piston turns the crank, that's the usable output. The heat
is waste energy. If they can find a way to get torque without as much
waste heat, sure, but it ain't gonna happen with the Otto cycle no
matter what they make the parts out of.


Combustion engines burn fuel which creates heat to make power, yet the heat needs to be controlled so as not to melt the working metal parts. It's a balancing act that is the main reason for getting only about 40 per cent efficiency out of fuels. Ceramics can stand a lot more heat, and the theory was that more power can be got before things break, increasing efficiency. There'd still be waste heat, but less need to hose the thing down.
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