Rotary engines differ from conventional ones in many respects — and one of them is the fact that they use two different spark plugs. Here's why.

Displacement: 15.9 L (970.38 cu in.) Bore and Stroke: 115 mm (4.53 in.) x 170 mm (6.69 in.) The rotary engine reduced rough the running and overheating of early air-cooled engines, namely.

Perfectly tuning the heat range of an engine's spark plugs is something of a dark art to all but the most well versed tuners and the engineering egg heads at automotive OEMs. Getting the spark plug ...

Developing a gasoline-powered rotary engine was a dream for Felix Wankel, and we mean that literally. Some steam engines worked on the same basic principle as far back as the 18th century, but the ...