The WANKEL engine, named for the German company that invented it, now a part of Audi via the Auto Union, ... which is why Mazda pays royalties to Audi for every RX- sold, ... I digress.

The Wankel is efficient, but like a turbine, it has at this point only been able to be efficient at a fairly narrow RPM band. Good for fixed-rpm pumping applications like John Deere manufactures for the Navy, bad for automotive applications where a broad RPM range is necessary.

The problem I see with making it a diesel, on top of the pressures necessary over a large surface area and seals, is the heat loss to the large surface area and keeping it hot enough for efficient diesel operation. The surface/volume ratio on a small one would be a big problem IMO.

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Gone to the dark side

- Jeff