Now that Mazda has breathed new life into the rotary engine, we thought now would be a good time to review how exactly this mystical engine works.

Rotary’s take everything you thought you knew about internal combustion engines, and throws it out the window. Pistons have been replaced with rotors, piston rings with apex seals, and unlike a conventional piston engine all four strokes occur at the same time – all the time.
The video below explains the whole thing perfectly