Quote:
Originally Posted by Sludgy
So far the only waste energy that automakers have been able to recover on a commercial (i.e. economically viable) vehicle is brake energy, i.e. in hybrids.
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Turbos would perhaps count as being powered by waste energy.
Putting a turbine in the exhaust stream and connecting the output to the crankshaft also works. This principle was used on at least one aircraft engine (WWII?). I also saw some reference to something that looked like this on a current truck engine. They used both a turbo and another turbine for crank augmentation. For the aircraft engine, I saw a figure of 8% improvement in power if I remember correctly.
Sorry for running off-topic...