A diesel engine doesn’t use spark plugs ... More good news is that Mazda has not abandoned the rotary engine just yet, and the company’s engineers are still working on future solutions.

the automaker's brand-new clean diesel four-cylinder engine. It may not be quite as radical as some of the company's past rotary racers, but the new Mazda6 Skyactiv-D racecar does have a notable ...

On top of the diesel experiments, two C 111's were selected to test a V8 engine. Merc engineers removed their rotary engines and installed a 3.5-liter V8 in each, and instead of the four-speed ...