Ran across this site / vendor selling kits that add manual mixture adjustment and automatic mixture adjustment kits for 912's.

In principle, and per their claim, if you can fine tune mixture for for optimal actual conditions you should get better performance, better fuel efficiency, etc.


They show on some engines on their site some documentation of improved fuel efficency, etc.
If their claims are even approximately true it would not take many hours for one of these kits to pay for itself in fuel savings.

Curious if anyone has, or knows of, any experiences with these kits, or comments/thoughts.

If I understand right owners of standard category aircraft with 912's probably could not legally use these kits, but us owners of experimental and amature builts could.

Any thoughts?

  • Re: manual mixture adjust kit 4 912

    by » 12 years ago

    Hi Al

    What I would say is we put a probe in the exhaust a couple of years ago when we were considering fuel injection. We flew for an hour at every conceivable height and airspeed and throttle setting and what we did see was the fuelling on a 912s with carbs was unbelievably accurate.

    I would not consider altering the fuelling/ carburation on these engines in any way, doing so can only come with problems that could prove very expensive.

    If it ain't broke, don't fix it.

    Cheers Mark

    Thank you said by: Al C

  • Re: manual mixture adjust kit 4 912

    by » 12 years ago

    Hi Al,

    I'm with Mark. I would leave it alone. For every 1000' in altitude you go you loose 3% of your performance. So at 10K' you have lost 30% of the engine efficiency anyway. people who tend to want to lean things out one day pay a price in a maint. issue from one thing or the other.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

  • Re: manual mixture adjust kit 4 912

    by » 12 years ago

    I tend to lean a bit further: Out to to the if-it-ain't-TOO-broke-don't-fix-it.
    On the other hand we have, and I share with many folks here, the
    "An ounce or prevention is worth a pound of cure" philosophy that contradicts the first one. ;)

    In this case, particularly with your data in hand, and Roger's reminding me that even with optimal mixture you still lose power, with this time I'm going with your and Roger's call.

    There are plenty of other places I can put $250 to use in on the plane ;)


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