Daox,
good work with the grinder. Those grinders are generally have high RPM low torque out put. Do you have any other pneumatic tools to try with?
jdgFirefly,
I missed the turbine driven belt pulley idea, that is interesting, and may work well, though turbines generally spin in the 15K+ rpm range...
I'm a little unsure of the way it would react to normal driving. There are sudden changes from lots of heat to none in the exhaust. I feel a system like this would have to much of a delay to react to this effectively. But a turbo charger acts in a similar way, before an acceleration you might warm up your boiler...
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