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<t>A huge amount of the energy used to do work in an ICE is lost, either through cooling or out the tailpipe. Obviously, if one could economically recover a portion of that energy, what was a net gain to the oil companies and a loss to the consumer becomes the opposite. <br/> <br/> The key here is, ...

<t>The temperature difference the header, or exhaust manifold as it is called, and the tailpipe is close to 1,000 degrees. That's not a trivial amount, especially when the success of a Stirling engine is proportional to the temperature differential. <br/> <br/> Not recoginizing the difference betwee...

<t>For the record, we both know Mr. Hengsteler was not talking about collecting energy at the tailpipe, but at the header where the majority of the energy being consumed by an internal combustion engine is being wasted. <br/> <br/> A heat to ultrasonic converter might be an interesting beast, but it...

Mr. Hengsteller is 100% right on the money. As new sources of energy become harder or more expensive to develop, recovering waste engergy becomes increasingly more attractive from environmental, economic and security of supply perspectives.

Apparently BMW thinks thars gold in that thar waste stream, as I understand they are working on a microsteam generator to produce electricity from a car's exhaust. And what would one do with all that electricity?

Well, there are these new cars out now called hybrids........?