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Does anyone have a good explanation for how these Rotax engines (914 in particular) are able to perform so consistently without the manual Carb Heat and Mixture settings that traditional Lycoming and Continental engines so often rely on? Thanks..

  • Re: Mixture & Carb Heat

    by » 2 weeks ago


    The 914 does not require carb heat because the turbo heats the air enough that carb icing is not an issue.


  • Re: Mixture & Carb Heat

    by » 2 weeks ago


    More food for thought:

    The variable throat Bing 64 carb helps stave off carb ice, but it can and does still happen. The folks in the UK have more days where temp and humidity are just right for this. The owners with an engine in a cowling and their air filters are attached right to the carb and use under the cowl hot air vs outside the cowl cooler air run in carb heat mode all the time and they run a bit richer just like when you actually add carb heat.


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-574-1080 Home (TRY HOME FIRST)
    520-349-7056 Cell

  • Re: Mixture & Carb Heat

    by » 2 weeks ago


    Mixture control is automatic via the carb pistons.

    My 912ULS does not have any cowling, but I have a system that circulates warm coolant in a collar around the engine end of the carb, intended to warm things enough to prevent icing (see left of photo).  Obviously such a system is not possible in an engine without liquid coolant, where the air itself has to be preheated to prevent carb ice, causing the side effect of making the intake air less dense.

    27726_2_carb.jpg (You do not have access to download this file.)

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