Wankel port timing?

[RCKid]

Does anyone know what the typical port timings (inlet & exhaust) are for a Wankel rotary like the Mazda RX engine? I assume that with respect to top and bottem dead center, they are similar to a reciprocaters' poppet valve timings but slightly different to allow for the fact that ports normally open and close faster than poppets. - Jerry

 

[EngJW]

There is a book about the RX7 and a Haynes repair manual that list the timing. These could be available in your library. Timing is specified the same as for a reciprocating engine. There is less control over where the ports open and close as compared to valves. As you say, they open and close faster, and I think the overlap period is considerably different.

John Woodward

 

[RCKid]

Thanks a lot John, I'll give those sources a try. - Jerry

 

[RCKid]

Just answering my own question. I recently came across a very good discussion of wankel port timing including typical values for various states of tune. Go to

http://personal.riverusers.com/~yawpower/dectech.html