Will the Maximite be able to monitor and change the fuel/air ratio via
    the o2 sensor.
    Regards Andrew Campbell.

    Yes but be aware 100LL aviation fuel kills O2 sensors. I would not use
    that as the only sensor to set the mixture. I would still have a MAP
    or Mass Airflow Sensor. I would also use the wide band variety and place it
    at the end of the exhaust pipe. Aviation rotaries run hotter exhaust as
    they are on average a higher percentage of max power.

    Paul Lamar




    Paul,
    Thanks for the information, I know very little about rotary engines apart from what I have learnt from your emails and your books.
    Some time ago you suggested that some people have had a certain amount of success with fuel injection before the turbo, do you have any contacts that I might be able to use to obtain some further info on how the set up is working?
    Regards Andrew Campbell


    It is common practice with carbs so it should work with fuel
    injection. If you can't find one injector large enough you
    can use several. It is a good idea anyway as one injector can fail.

    I don't personally know anybody doing it that way.

    Paul Lamar



I personally wouldn't do it that way and here is why- injecting the fuel before the turbo results in an explosive fuel/air mix under pressure. In the event one of the hoses from the turbo to the intake come loose, and they can I can personally attest to that- then you have a very large blowtorch under your cowling. I would suggest injecting the fuel a moderate distance upstream just enough to get proper atomization.

Recently a pilot came to my shop with a real life story. He flies a turbo cessna single. Recently at 18000 feet he felt what seemed like a loss of power, but not significant enough to lose altitude. He continued on. A few minutes later he heard a loud noise and then lost most of his power. After an emergency descent and a safe landing here is what happened:

One of the silicone fittings that connect the turbo outlet to the intake had first split which reduced the manifold pressure. Then a bit later it let go completely. If you are injecting your fuel ahead of the turbo and this happened you would be spraying a very explosive F/A mix directly into the cowling which could have very bad results.

Kevin Alderman



Also not a good idea to put the carb before turbo is that when you close the throttle you create a large vacuum in the inlet turbine which is not good for the bearing/seal, it will fail eventually creating LOTS of smoke !
   Chris. Hoskins


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