Here's the process of making this rotary valve engine with a different intake and an exhaust system. It wasn't easy to start ...

Rotary engines (also known as Wankel engines and Wankel rotary engines) are quite different from piston or "reciprocating" engines. One of the distinguishing features is that they don't need valves to ...

Last month's "How It Works" story gave you the basics of the four-stroke cycle, describing the motion of the intake and exhaust valves in relation to the piston moving up and down in the cylinder.

In this video, we explore the RevForce engine from Alpha Otto Technologies, a breakthrough in two-stroke engine design. We ...

That alone reduces emissions and increases engine longevity. The rotary valve also means that the blockages caused by conventional poppet valves are not an issue as poppet valves are not needed in ...