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Mazda's rotary engine is making a comeback, thanks to the company's latest patents. The rotary engine is unique from piston engines because it uses a triangular rotor and oval-shaped housing, which allows for a lightweight, efficient, and cheap engine. Despite its advantages, the rotary engine has had its share of controversy. With Scotty Kilmer's car repair tips and DIY car repair tutorials, you can get the most out of your rotary engine and keep it running smoothly.