Sterling engines in cars?

[Peter_Pan]

Why don’t car manufactures use Sterling heat engine to increase the efficiency of there cars. Most of the energy of a car engine is wasted though heat . They could use a Sterling engine to compliment the normal engine by using the heat from the exhaust to power the heat engine. Which then intern could power thinks like aircon which could increase the mpg by up to 5-25%. Just an idea.

[Mokele]

BMW already has prototypes along such lines. Productions models are expected to follow relatively soon.

 

Mokele

[Peter_Pan]

I see http://www.gizmag.com/go/4936/ Not exactly what I had thought off this seems to use a normal steam engine not a sterling engine but the same idea. Thought it was a good idea, thanks for that info.