The internal combustion engine has evolved and settled on the current design of pistons and poppet valves. Configurations differ from in-line cylinders (straight six, for instance) to “V” configurations (like the V8) to horizontally opposed (VW air-cooled and Subaru style) but internally and operationally they are all similar.

A few other engines reached maturity, but never matched the scale of the common internal combustion engine, such as the two-stroke used in smaller applications and powersports, and the Wankel rotary that Mazda tried to market broadly in the 1970s.

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