if this worked, why aren't they using cylinder heads to pump thier own water through convection? I have an old boxer that gurgles like a coffee pot in the heater core...and it s a direct shot inches from combustion chambers as the source of heat. As soon as the heat source notices the exhanger, at any distance from the combustion, it will be lost dramatically. As an example, just one foot from the convertor in my own car has an accidental shot of 260 degree paint, that never left it.
The exhaust has radioactivities as well...gurgling noises would only be one unstoppable weirdness..I bet it could recycle its own electrical current from spark plugs. The direct shot of a turbine with actual exhaust pressure is about all one can do and stay sane with a function like this, its called a turbo.
