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Anyone know the CFM for the Bing 64 carb?

  • Re: Bing Carb

    by » 4 years ago


    Lacking any orther Data Source ...

    Using an online "Air Flow Rate through an Orifice Calculator" says,

    A 36mm Orifice with a pressure drop of 1.5"Hg will flow 196cfm under Standard Conditions. (32°F at Sea Level)

    Allowing a 70% Error Margin, lets call it ~140cfm.

    That should at least put you in the ballpark.


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


  • Re: Bing Carb

    by » 4 years ago


    It is important to understand that cfm has nothing to do with fuel. The fuel delivery circuits in the carb can be tuned to meet the engine's needs. But, the first step in choosing a carb is to get the right airflow.

    Another formula as mentioned by Bill.

    CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3,456

    Example: Using a 914 engine= 73.91  x 5,500 max rpm = 406,505‬
    Take , 406,505x 0.85=345,529.25‬
     
    Then 345,529.25‬ ‬ ÷ 3456 = 100 appx CFM
     
     

  • Re: Bing Carb

    by » 4 years ago


    Charles,

    The Carb is more than capable of suplying the engine with fuel to Waaaay past redline speed even if you bored it out 20%.

    The question is, "What do you really want to know?"

     


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


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