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There is an article on turbo-compounding in either Race Tech or Racecar Engineering magazine (can't remember which, I buy both) for this month or the last month.
Talk about it coming in to LeMans and maybe F1. They show 3 different ways to use it.
Simple exhaust drives a turbine which attaches to the crank via reduction gears.
'Normal' turbo system with the above system to further scavenge energy. I think they said that it needed to have a certain amount of boost to create enough of a pressure differential for it to really work.
And a supercharger system with it attached.
They talk about its history in airplanes and how Cummins and Caterpillar are using it in big rigs for fuel savings.
I'll have a re-read tonight, and try to give a better synopsis than this half-remembered gibberish tomorrow.
I originally thought you were talking about staging turbos (one feeds into another before the engine) when you were talking about compounding.
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