Kawi2strokes.com Forum

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........

rotary like a 2 stroke

Have skills and MONEY

4 rotor RX engine kits have been available for decades now, and, they do bring real excitement to the rotary engine world, but, they suffer badly, even when sequentially fuel injected, with obnoxiously bad fuel mileage.

As a prototype concept vehicle 4 decades ago, Mercedes Benz built the C111, a super slippery chassis/body package, with their version of a 4 rotor Wankel engine, was really fun, NO fuel mileage.

If you have ever been within a half mile distance from a "race" two rotor Wankel engine with "race exhaust" (a very modified version of a two stroke chamber), you will know that some people can get physically ill from the sound and disruption of the air around them, and not from the exhaust fumes. It is a really weird feeling to get sick like you have some sort of really strange stomach issue just from the noise/vibration output of an un-muffled race rotary engine.

When I got my 1976 RE5, it had the exhaust diverter manifold stud holes stripped out. I removed the manifold to redo the bolt holes, and decided to "just fire it up to see what it would sound like". This is a single rotor Wankel, not a hot rod, and it still made me feel queasy in the stomach.

Then up the "ante"........

And how many knew the rotary is a 1/3 stroke?.............

http://www.youtube.com/watch?v=Ay9pTLa3mSE#at=151

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........

In theory, as long as you can fabricate an excentric shaft, and bolt cases together, any number of rotors can be made into one engine, with reasonable common sense, as the one in the video is a 6 rotor. Sequential EFI would be the only sensible induction system.

The most successful motorcycle Wankels were, I believe, the Norton Interceptor units, were built for British police work, and as endurance race engines, very successful. Hercules had an air cooled single rotor design for a Sachs built bike, and Yamaha, Honda, Kawasaki all did feasibility study prototypes. I saw both the Yamaha and Kawasaki prototype test Wankel's in person, heard both run, but didn't get the opportunity to ride either. Both were a lot nicer than the RE5 I own.

I haven't stayed right up with rotary tech of late, but am aware that the Wankels are reasonably efficient on intake workings, having very slightly less intake reversion than a piston port two stroke. I wonder, and what results were found, if someone has tried to add a good reed valve to the inlet tract on one. From the Mazda experience I have had, the EFI rotary's are a lot better at not belching up raw fuel vapor back into the inlet tracts, but only because they are mostly dry air fed, fuel injection nozzles down in the inlet tract, very near the rotor port. On a carburetted Mazda rotary, with wet fuel in the inlet tract all the way back up to the carburetor, they were fairly miserable with reversion back up the line. Maybe John would know.