Quote:
Originally Posted by Formula413
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?
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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.