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

Here you go. Port timing basics by Paul Yaw.

Lynn E. Hanover

Remember the timing numbers do not refer to the rotor face that is currently
at TDC. It takes about 270 degrees or more for the rotor face that is in
the process of loading air and fuel to make around it to TDC.

Paul Lamar

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