Hi Paul,
    on the comparison graph, is there a typographical error where it states the inlet S port opens 32 _after _TDC.  Surely the inlet S port opens _before_TDC?
    Rs,
    Dave in Perth

    Could be. The early Rotary Engine  book had a few errors.
    It may be some other rotor face?

    Paul Lamar

I may be confused here. The top and bottom charts are for ignition timing. The center charts depict the cycle timing for various engines.
My observation is that when rotor 1 is at TDC, rotor 2 should be at BDC. The side port engines with stock or street ports will open the intake at some number of degrees ABDC. The intake will close at some degrees ATDC in respect to the rotor face preceding. With respect to bridge port and p ports the timing is radically changed or extended.

Dale Davies

Check this out.
http://www.rotaryeng.net/how-wank-works.html

It helps if you have a plastic model.

Paul Lamar

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