BMW has been doing this for a while, they have a 740 with it. In one of the mags about a year ago. Cant imagine what that catalytic converter costs :eek:
My understanding was that the pulley example was purely for concept understanding and thats not how the system actually works at all. I was under the impression that actual contraction and shrinking happened at a very small scale and the material generated electricity from the temp/size change. They would then use that electricity to replace the alternator in the car.