Many of you have seen the process of making this rotary valve engine with a different intake and exhaust system and how I tried to start it. If not, then let's watch the previous video first. After so ...

Rotaries are truly fascinating engines. They’re small, lightweight and unlike anything else on the road. Also, people keep saying something about a spinning Dorito? One of the coolest Lego projects we ...

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.

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 ...