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Thread: Bing 54 flooding at idle on decent

  1. #1

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    Bing 54 flooding at idle on decent

    I have a cauna 3 cylinder motor with 3 bing 54 carbs. The engine runs great. It idles a little ruff. When on approach to land when pulling the throttle back to idle it will studder and stall, only while decending to land and no other time. If I keep the rpms up over idle it will not happen but I have to have a longer approach as I am still with some thrust and slowing down becomes harder.
    I have tried to give extra fuel for choke to test if it was too much fuel or not enough as the problem but no change. I have also tried to catch it by giving throttle but can not always catch it before stall.
    What could be the problem. It could be 1 or 2 of the carbs doing it and not all three.

  2. #2
    Mike Switzer's Avatar
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    I haven't messed with a Bing carb in over 20 years, so this may not apply, but a lot of the time flooding at idle is caused by the float valve being stuck open.

  3. #3

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    flod at idle

    That is a good point but it will idle on the ground fine. It only happens in Neg G on decent. It must still be due to gas rising into the venturi but how if the floats are shut. Once on the ground it restarts fine and idles fine.

  4. #4

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    I don't know that engine or carb, but what you describe sounds like carb ice if it was in an 172 or similar.

  5. #5

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    Quote Originally Posted by danawalker2@gmail.com View Post
    It only happens in Neg G on decent.
    Yes, neg G will stop the fuel flow in a float carburetor....

    I'm guessing you mean nose down in a descent. Most likely one carb bowl is overfilling, float level too high or a leaky needle valve/seat. Need to isolate which cylinder is being enrichened.

  6. #6

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    That sounds like the problem

    That makes perfect sense. I have set all 3 exactly the same and I used to have a problem due to vibration of a carb every once in a while over filling and loosing fuel from the over flow vent. I thought it might be a sticky float shutoff needle not fully seating. But, because it was random I could not pin point the cause.

    Thank you all for your help.

  7. #7
    Mike Switzer's Avatar
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    Could be the nose down attitude is putting one of the floats in a position in which it will bind up. A lot of times float problems are intermittent & a real pain to troubleshoot.

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