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912 uls idle mixture and balance

in General Tech Discussion 6 years ago

  • Re: 912 uls idle mixture and balance

    by » 6 years ago

    A larger cross over tube is still not a substitute for a carb sync. It can only do so much especially if one carb is opening at a different setting vs the other. Never fail to sync carbs. Doing so can cause gearbox issues down the road or cracks in other places like mufflers, exhaust pipes, mounts, ect....

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

    Thank you said by: Eugene Klimenko, Andrew Dunning
      
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  • Re: 912 uls idle mixture and balance

    by » 6 years ago

    Here is better design with common large plenum and equal intake distance to every cylinder. Situation with 2 carburetors feeding 2 opposite engine sides requires precise balancing. Larger balancing tube is simply attempt to create this large common plenum. And in experimental aviation we can do this legally with very good result and very low vibration at Idle.

    IMG_0005.jpeg (You do not have access to download this file.)
      
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  • Re: 912 uls idle mixture and balance

    by » 6 years ago

    This is a whole different animal from carbs.

    Just a side note for many with an experimental certificate. Operating Limitations written by different inspectors when the plane was certified are not all created equal. They have guidelines, but can make additions or subtractions.

    I have read in some that any change in the aircraft must be approved by a FSDO or inspector in writing. Before you make changes in the US read ALL you Operating Limitations front to back.

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

    Thank you said by: Eugene Klimenko
      
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  • Re: 912 uls idle mixture and balance

    by » 6 years ago

    https://drive.google.com/file/d/0B9ZeEB_79LEPdTVQb3VYV1NBVms/view?usp=sharing

    In ELSA your Operating Limitation is not set in stone. At local FSDO I changed from VFR daytime only to night VFR. Of coarse after installation needed lights. Also installed LED landing light.
      
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  • Re: 912 uls idle mixture and balance

    by » 6 years ago

    You're held to your individual operating limitations in ELSA or SLSA in the US. You can't make them up or disregard them at will or there would be no use to even have them. If you have an incident you will be held to that those standards written in your limitations. That's why it's call Operating Limitations. This would also be a point for any insurance claim.

    If you were never accountable you could do anything with no consequences. Like some do with the IRS. You can claim anything you want, until,,,,,,,,, you get caught.

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

      
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