Hello all,
I am not an rx7 owner, however this is the only forum I could find that had an interest in Alternative Fuels. My hypothesis is if the exhaust/intake were closed thermodynamically, then an engine should be able to run pneumatically. It could power a generator, perhaps. All I know is when heat is applied to cold air, it expands rapidly. In order of flow: Exhaust Manifold, Condenser Coils, Heat Element Muffler, Expansion Manifold, Throttle Body, Engine