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Old 08-27-2008, 02:11 AM   #18 (permalink)
jamesqf
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Quote:
Originally Posted by Formula413 View Post
But isn't the power of the expansion used to move the piston in the firing stroke? How would just heat (and not pressure) turn the turbine?
When it comes to gasses, heat & pressure are pretty much the same thing. Here's a link to a wikipedia article: Gas laws - Wikipedia, the free encyclopedia

Bottom line is that unless the exhaust gas is coming out the tailpipe at ambient temperature & pressure (which it certainly isn't, especially just back of the cat), it's still got energy in it that can be extracted.
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