Quote:
Originally Posted by jamesqf
No, because the exhaust gas isn't really (or mostly) pushed by the piston, but by the power of its own expansion. (Think for instance of the difference in the noise level of an unmuffled exhaust and an air compressor.) The power captured by the turbine comes from the waste heat in the exhaust gas stream. It will be hotter upstream, cooler (and thus lower pressure) downstream.
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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?