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 ...

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 ...

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.

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 ...

With only two moving parts (the rotor and shaft), no poppet valves as featured in other four-stroke engines, multi-fuel capability, and minimal NVH characteristics, the non-Wankel rotary developed ...

Every 4-stroke engine ever made – about 80% of all engines currently in existence – function on this principle – even rotary engines ... is in the cam and valve timing.