The man just loves his rotary, to the point that he's built a 4-rotor Wankel engine before and shoehorned it into, well, you've guessed it, a Mazda RX-7. While the 4-rotor AWD, Jeep Grand Cherokee ...

Mazda's Wankel rotary engine has always been unique in the automotive landscape as a mass-produced internal combustion engine that eschews such unsightly items as pistons, valves and camshafts.