Has Mazda (or any modifier/OEM of rotaries) tried DI (Direct Injection) into the combustion chamber? Would it be a worthwhile “improvement”? It seems without the valves, it would be better than DI in a piston engine. I have learned that amongst others, that the Audi DI engine needs a ‘head job’ on the valves almost every 25K because the valves are NOT cleaned by the intake manifold injectors as that engine is DI…….and that the valves get ‘dirty’ very quickly!


Marc Wiese


It might. CW did a lot of direct injection. Might help with squish flow.

Paul Lamar

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