It’s a dedicated hacker who has the patience to build an engine from scratch ... to either the intake or the exhaust. Four Stroke Cycle with Poppet valves. Courtesy Wikipedia, CC BY-SA 3.0 ...

So, to answer the question, do rotary engines have valves? Yes, they do ... have three power phases instead of just the one of a four-stroke engine. This, along with the way the rotor is mated ...

[Huib Visser] built this glass cylinder four-stroke engine and he took ... the demo video we get a good look at how the rotary intake and exhaust valves work. [Huib] also took the time to ...

"There is no external oil being provided to lubricate the rotary valve, except through a 50:1 fuel oil mix used in two-stroke applications." Although this is a four-stroke engine, it needs this ...

While today we have well and truly accepted the fundamental rightness of the four-stroke piston ... on both piston engines with rotating disc-shaped valves and true rotary engines.

This was the first working engine design that did not use pistons, valves ... Otto-cycle four-stroke engine, just like most other engines today. The first production car with a rotary was the ...

it takes place in four different places all at once. A rotary engine doesn't have intake or exhaust valves, like a two-stroke piston engine and it also has to have oil injected with the gasoline ...

That's the LiquidPiston X rotary engine ... than the equivalent four-stroke piston engine it replaces Even better, the engine's design means that it has no poppet valves and exhaust is balanced ...