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It looks like that this winter we encounter severe carburatoricing problems. (This winter is typical Dutch: temperatures about 0 degrees Celcius and high hummidity.)

When we reduce the RPM from 5500 to 5000 the engine (912A) starts running roughly immediately! When activating the carb-heating the problem is also solved immediately. But when I try to decrease the carb-heat the engine starts running roughly even before I released the lever. It is even a littlebit frightening.

Strange thing is that during taxiing and warming-up the engine shows no signs of carb-ice. Also strange is the fact that last year we flew without these problems.
(in oktober we cleaned the carburators and we synchronised them).

Do we have to live with this nasty problem or is there anybody who can advise me?
Thank you in advance

Greetings,
Gerard Hanstede,
Hoevelaken,
The Netherlands
  • Re: Carb-ice?

    by » 11 years ago


    Hi Gerard

    You could fit the hot water carb heat system that presses onto the carb.

    It runs off the engine coolant and has no effect on engine performance as it only warms the carb body enough to prevent ice from adhering to the carb throat.

    you could run this in conjunction to your existing carb heat, (which you probably wouldn't use anymore.)

    Mark

  • Re: Carb-ice?

    by » 11 years ago


    Hallo Mark,

    Thanks for your quick responce. But as far as I knowe are those hot water carb. heaters not allowed on certified engines.

    Gr.Gerard Hanstede.

  • Re: Carb-ice?

    by » 11 years ago


    Hi Gerard,

    It's possibly carb ice, but it's pretty cold out and it may just be a little too lean. Are the carb needle clips in the #3 clip position?
    You may be running a little lean in that cold weather. Pulling the carb heat on richens the mixture so it runs smoother and as fast as you decrease the richness it runs rough from being leaner. The carb ice doesn't come and go as soon as you touch the lever.I think I would try to richen the mixture on clip position then give it a try and see if the problem duplicates itself.
    If it doesn't you have your answer.
    If you are having significant mag drops this may be another indicator to richen a tad.

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


  • Re: Carb-ice?

    by » 11 years ago


    Thank you Roger,

    I am delighted with your answer. Your explantion sounds very logical. We were also wondered and worried about the extreem rapid icing and found it hard to believe that the rough running was only caused by carburatoricing.

    Kind regards.
    Gerard Hanstede,
    Netherlands

  • Re: Carb-ice?

    by » 11 years ago


    Carb ice can happen, but it isn't instantaneous in accumulation or even getting rid of it.

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


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