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Carb heat removal.

in General Tech Discussion 6 years ago
Hi,
A used Rotax 582 I purchased from the UK came with two carb heat manifolds attached to the Bing 54 carbs, I won't be needing them in the tropics and they seem to be stuck fast to the carb housing. Can someone familiar with these tell me how to remove them gently without resorting to an angle grinder ?
Thanks.
Bing541.jpg (You do not have access to download this file.)

  • Re: Carb heat removal.

    by » 6 years ago

    they are glued on with loctite 648 high temp retaining compound. I doubt they can be removed without damaging the carbs.
    Thank you said by: Bob Arnold
      
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  • Re: Carb heat removal.

    by » 6 years ago

    Wrap a cool really wet rag around the carbs just behind the piece you want to remove. The wet rag should keep the area behind where you apply the heat cool enough until the part weakens enough to come off. Use a butane torch with the small pencil type flame and heat the area only where the Loctite is. I think you can get it off without damage. Another way to look at it is what choice do you have? I like the butane torch over other types of heat because I can be very accurate on where I want the heat and unlike the heat gun I don't have to heat an entire area. I rarely use a heat gun any more.

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

    Thank you said by: Bob Arnold
      
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  • Re: Carb heat removal.

    by » 6 years ago

    Can't you get carb icing anytime you have a temperature and dewpoint within 3 degrees C of each other? Summer , winter, tropics ?
    Isn't it the moisture , humidity that causes carb ice.
      
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  • Re: Carb heat removal.

    by » 6 years ago

    Can't you get carb icing anytime you have a temperature and dewpoint within 3 degrees C of each other? Summer, winter, tropics?
    Isn't it the moisture, humidity that causes carb ice.


    It is the Temperature and the Humidity/Moisture that are the factors.
    You will get Precipitation when the Temperature attempts to drop below the Dewpoint.
    The water in the air will precipitate out and you will see surface wetting or vapor fog.
    Technically, the temperature can never get below the dewpoint because the Latent heat of vaporization will hold the temperature exactly at the dewpoint as the water vapor condenses.

    In a carburetor, the latent heat of vaporization of the fuel tends to cool the incoming air stream.
    If it cools it down to the dewpoint you might see fog in the throat of the carburetor.
    This fog will tend to wet the carburetor parts.
    If the cooling also happens to cool the carb parts below the freezing point of water, then you will experience Ice.
    Generally, if the ambient temperature is above ≈10°C (50°F) Icing will not be a factor.
    The closer the temperature is to freezing and the higher the dewpoint, the greater is the chance of forming Ice.

    A few examples. (All temps in °F)
    Ambient temp: 80 Dewpoint: 60 Fuel Vaporization cools induction Air to 65 Result: Dry intake.
    Ambient temp: 80 Dewpoint: 70 Fuel Vaporization cools induction Air to 65. Result: Wet intake.

    Ambient temp: 50 Dewpoint: 30 Fuel Vaporization cools induction Air to 35. Result: Dry intake.
    Ambient temp: 50 Dewpoint: 40 Fuel Vaporization cools induction Air to 35. Result: Wet intake.

    Ambient temp: 40 Dewpoint: 20 Fuel Vaporization cools induction Air to 25. Result: Dry intake.
    Ambient temp: 40 Dewpoint: 30 Fuel Vaporization cools induction Air to 25. Result: Iced intake.

    Ambient temp: 30 Dewpoint: 10 Fuel Vaporization cools induction Air to 15. Result: Dry intake.
    Ambient temp: 30 Dewpoint: 20 Fuel Vaporization cools induction Air to 15. Result: Iced intake.

    Remember when it is 80°F on the Ground, it is 40°F at 12,000ft.
    You might experience Ice when cruising at an altitude that contains clouds.
    It makes little sense of going through all the effort to remove the carb heaters for no reason.
    You may not need them in the Philippines, but the next owner flying it to Korea might see them as a great selling feature.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

    Thank you said by: Bob Arnold
      
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  • Re: Carb heat removal.

    by » 6 years ago

    I have experienced carb icing climbing out on a humid day with my 912ULS ground temp mid 70s at altitude mid 40s. When I leveled out at 10,500 ft the engine was running rough and carb heat cleared it up.
    Thank you said by: Bill Hertzel
      
    Report
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