If I don't make it for some strange reason (I am flying standby)
    you will need some tiny test clips to grab on to Tracy pressure sensor.
    You can buy them in Radio Shack, Mouser or Digi Key. I'll pack some
    but just in case you should get some.

    Measure the pulse close to the intake manifold and compare it with
    the output of the vacuum can going to the pressure sensor.
    Tracy has two pressure sensors so one can be used to run the engine
    and the other to the output of the can or vice versa.

    Larry suggested a coil of 1/8th OD tubing works well to damp
    the pulses. Worth a try.

    Any questions?
    --
    Paul Lamar ...No rotor no motor.

    Mark, if you get a chance next week  please solder up a 37 pin D sub
    min for power
    and gnd for my computer. Then we won't have to open up yours to
    get to the pressure sensors. That is if I make it there.

    Here are some more pictures.
    --
    Paul Lamar ...No rotor no motor.

    OK I made it.

    I won't keep you in suspense.

    Mark, Doc and I got the slide throttle P-port EFI 240 HP engine
    running. I was very happy indeed.
    No problems. We changed three major things. We installed a $7
    mechanical fuel pressure
    gauge which, IMHO is absolutely necessary  when you are first
    starting up an
    EFI rotary engine. You need real confidence in these sorts of
    things. You can't
    be messing around with some EFI sensor you are not sure is really
    telling you the
    truth. We set the fuel pump pressure up from 35 psi to 60 psi.
    Changing the pressure
    changes the whole look up table up or down. Up for richer down for
    leaner.
    In and of itself this did not help. We installed a pulse damper can
    in the vacuum
    line to the pressure sensors. The results of this so far are still
    indeterminate.
    The biggie was setting the timing correctly. More about that latter.
    Once we did that
    the P-port engine fired right up with less than two blades and ran
    smoothly at about
    2000 engine RPM (700 prop RPM). We pushed it out of the hangar and
    started it up
    again. Again no problem. We had it up to 4500 engine RPM. We started
    it two or three times
    no problem. Each time it started right up and ran the same. The
    altitude at Marks
    hangar is 6000 feet.

    It was getting late so we stopped and went home while we were ahead.
    Mark probably
    went out to the hangar on Sunday and ran it some more  so I can
    hardly wait to get
    his reports. I left early Sunday morning. Thanks for dinner and
    putting me up Mark.

    Thanks Doc for showing up with the bit scope. Unfortunately we did
    not get the
    engine running in time to do R&D on the intake manifold pulse problem.
    It is running fine with the pulse damper can so we can leave it at
    that for now.

    Paul Lamar ...No rotor no motor.


Very cool..

What do you think of the sound of that exhaust system?

Matt-

I hardly noticed. I have heard the rotary so often I did not pay any attention.
It was not overly loud for a rotary. If anything I have heard louder ones.
-- 
Paul Lamar ...No rotor no motor.

Good going Paul & Mark. Too bad I had to leave at 1915.

I measured 104 dB on the A scale while we were trying to get it started. I
was standing at the wing tip. The engine was running at what I estimate as a
fast idle.

Doc Custer
Retired Software Engineer and sometime Audiologist



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