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Originally Posted by waynne  As an aside! Can you theoretically do a rotary diesel engine? |
There are certainly diesel powered turbine engines in service daily - they differ little from aircraft jet engines. Jet fuel is broadly similar to diesel, too. Turbines are probably the most perfect rotary engines. Effectively an infinite number of cylinders - hence the phrase 'turbine smooth'.
I'm not sure if you can do a Mazda type of rotary because the injection ports are obscured by the rotor tips at full compression so there's no way to get the fuel in at that time which is what's required by a diesel type engine.
NSU was the innovator behind the Wan*el engine in the 1960's. IIRC, Audi grew out of NSU.