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I read about a racecar inventer one time that created an engine that would produce 2-3 times the horsepower as his competors with the same displacement engine because it ran at 400-500 degrees F. Problem was it wouldn't reliably make it through a single race. I'll try to find that article, but it was several years ago that I read it.
The carnot cycle, like the stirling cycle, is more efficient when run a higher temperature and higher differential. In the stirling cycle I know it's because it provides greater expansion, but I'm not sure if it's the same in the carnot cycle.
Edit: It's crazy how hard it is to find an old article about a hot engine. I'm usually pretty good with google, but all I'm coming up with a bunch of people whining about their car overheating. Does anybody know what I'm talking about or remember any more?
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