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Hydrogen combustion engines are slowly picking up pace, and here are 10 companies that are working towards developing them.

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Porsche has filed patent documents with the U.S. government for a six-stroke internal combustion engine.

It starts with the number of cylinders —the more the better. The combustion stroke is what generates sound and, in a typical four-stroke engine, that happens once every two crankshaft revolutions.

The 4-stroke Detroit Diesel engine ended up retiring and eventually replacing its 2-stroke counterpart, but it'll be a long time before people forget about the legacy it left behind.