Wankel rotary engines
where do i start! you really need a diagram to make any sense of it but in simple terms like a rotor pump, the 4 stages of combustion work in the same way as normal but with one turn of the lobes!
http://auto.howstuffworks.com/rotary-engine.htm everything you need to know
and just as a note the RX-8 doesn't have the wankel rotary engine. it has a Renisis (or something like that) but still works in the same way.
he says it doesnt have wankel. it is a wankel because of design but it is just made slightly more efficient by renesis.
Mazda came out with the Renesis which is essentially a redesigned wankel engine. Felix Heinrich Wankel (German Engineer), created the engine though the location of the intake and exhaust ports proved to have some issues, The main design of the wankel was intentionally for aircraft where the smaller engine was lighter and put out more power than a piston engine of the same size meaning the aircraft would be able to have a larger payload. The engine which does all 4 strokes of an engine at a different portion or the rotor at the same time rather than in a sequence. THe fuel is injected into one cavern created by the trianglular shaped rotor as it rotates the cavern gets smaller compressing the air and fuel into a tighter spot where it is ignited by a spark, forcing the air and fuel to expand turning the rotor, on the opposite side of the injection is the exhaust. Having fewer moving parts and a steadier rythm allows the engine to rev higher, while not producing as much torque can still produce substantial HP. The rotary engine is generally plauged by flooding, failures of the apex seals around the rotor, carbon build up from unburnt fuel and oil. The renesis being a fuel and oil injected engine is at a 100% loss for oil. Mazda realising that unburnt fuel in the original wankel engines got forced into the exhaust causing problems for the catalytic converters moved the exhaust and intake ports to the side of the engine rather than the edge where they had been, meaning unburnt fuel stays in the engine longer rather than being forced out the exhaust the unburnt fuel gets pushed the the engine some more until it is burnt away while some may make it into the exhaust the solution to that problem also helped the car get a little more gas efficient.