Re: OT- fuel mileage & fuel injection questions

On Fri, 23 Jun 2006 11:38:29 +1000, Jordan <jwprincic@xxxxxxxxxxxxxxx> wrote:
Dave Hinz wrote, but Jordan again deleted the attribution for:

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,

No, it's not the heat which makes the power, it's the thrust generated
by the expanding gas. The heat is a byproduct.

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.

How will letting the pistons get hotter, make that fuel exert more
pounds per square inch on the top of that piston?

There'd still be waste heat, but less need to
hose the thing down.

Your understanding of internal combustion engines is flawed.

.

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