The Wankel engine is the most famous rotary engine, but it isn't the only kind. While they aren't as common these days, they haven't fully gone away.

Unlike piston engines, Rotary engines don’t require valves to run. Here’s how rotary engines work and why some designs have incorporated valves.

That simplified the engine and eliminated the lubrication and high-load problems, but also brought the Szorenyi back to a three-chamber rotary closer in concept to the Wankel.

The Wankel rotary engine is known for its troubled life in the mainstream automotive industry, its high power-to-weight ratio, and the intoxicating buzz it makes at full tilt. Popular with die-hard… ...

Sometimes called a Wankel rotary in reference to its inventor, Dr. Felix Wankel, the rotary engine consists of two rotors, two rotor housings, three support housings (front, intermediate and rear ...

From the December 1969 issue of HOT ROD: After talking about Wankel engines for years, foreign automobile manufacturers started producing the revolutionary powerplants—and they really worked.