Through the history of internal combustion engines, there has been plenty of evolution, but few revolutions. Talk of radically different designs always leads to a single name – Wankel.

To clear things up, Mazda never pioneered the Wankel rotary engine. German inventor and ... known to thrive when fueled by ethanol or natural gas, making them a potential great landing spot ...

Wankel rotary engines feature an equilateral triangular ... ranging from gasoline to ethanol and natural gas. Disadvantages of a rotary engine include lower fuel efficiency, increased emissions ...

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.