Well this is very interesting. Mazda has filed a patent application for a supercharged two-stroke engine!

The engine seems to combine Mazda's existing compression-ignition Skyactiv-X tech with a supercharger.

It uses spark ignition in high-load operation and compression ignition (like with diesel engines) in low-load operation. The engine, the patent argues, prevents knocking at high loads while improving fuel efficiency during low load compression ignition.

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