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  • #1

    Carburetor?

    What is the correct Marvel Schebler carb to replace my Stromberg NA-S3? I want to have better control of accurate leaning since I am always flying at 9 or 10 thousand feet. Yes, I do have mixture control now, but it is not precise and does not perform the way I think it should. Does anyone know of the best place to find what I need? I have the C-85 with O-200 pistons, rods, and crank.
    Thanks,
    Charles
    Tags: None
  • #2
    Re: Carburetor?

    Look on the Type Certificate Data Sheet (TCDS) for that engine

    Comment

    • #3
      Re: Carburetor?

      Originally posted by MontanaT-craft View Post
      What is the correct Marvel Schebler carb to replace my Stromberg NA-S3? I want to have better control of accurate leaning since I am always flying at 9 or 10 thousand feet. Yes, I do have mixture control now, but it is not precise and does not perform the way I think it should. Does anyone know of the best place to find what I need? I have the C-85 with O-200 pistons, rods, and crank.
      Thanks,
      Charles
      I have a C-85 on my BC12D sn7700 installed under the normal STC SA1-210. My carb is an MA3-SPA model 10-4894 which is technically the O-200 carb. It has been modified for the C-85 under STC SE01309SE from Lowe Aviation which replaces the O-200 nozzles with C-85 nozzles, part number 47-856. I understand that this is because the TCDS official carb for the C-85 is somewhat hard to find, and the only real difference between it and the O-200 carb is the nozzles. Now, that last sentance is pure hearsay, and anyone with some real knowledge is requested to jump in and (gently please) correct me.

      I do find that the mixture is reasonably effective in that I can lean until it peaks and shut down the engine and all that good stuff. Having said that, I just got some time in a pure A-65/stromburg 1941 BC12-65 with no mixture control and have found that it performs wonderfully off of our 7200' msl airport and gets over a 10500' pass just east of here with no trouble.
      Skip Egdorf
      TF #895
      BC12D N34237 sn7700

      Comment

      • #4
        Re: Carburetor?

        Originally posted by MontanaT-craft View Post
        What is the correct Marvel Schebler carb to replace my Stromberg NA-S3? I want to have better control of accurate leaning since I am always flying at 9 or 10 thousand feet. Yes, I do have mixture control now, but it is not precise and does not perform the way I think it should. Does anyone know of the best place to find what I need? I have the C-85 with O-200 pistons, rods, and crank.
        Thanks,
        Charles
        Yes. Call don swords and he will tell you EXACTLY what to do. He might even tell you to keep the Stromberg but have it overhauled by a pro, not a bumbler.

        Comment

        • #5
          Re: Carburetor?

          Charles, Do you have a vernier type control knob? I can't imagine trying to adjust that mixture control without one. It is quite sensitive and the rotating plates on the carb must have very smooth surfaces that mate well. Mine works really well at 10-11,000 and up per my last check.
          Darryl

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          • #6
            Re: Carburetor?

            Originally posted by flyguy View Post
            Charles, Do you have a vernier type control knob? I can't imagine trying to adjust that mixture control without one. It is quite sensitive and the rotating plates on the carb must have very smooth surfaces that mate well. Mine works really well at 10-11,000 and up per my last check.
            Darryl
            Darryl,
            I have been wondering if that would help. Are you able to get the increase in RPM that tells you that you are getting the best power setting? For me, that just never happens. Hence, my search for a solution. Which model vernier control do you have?
            Thanks,
            Charles

            Comment

            • #7
              Re: Carburetor?

              Charles,
              Part of the common problem with the Stromberg carbs is that they're a bit misunderstood. By the very design of the carb, it is already doing some of the mixture work for you automatically, so people don't see the "standard" behavior that they expect, and assume that the carb isn't doing it's job. The Marvel is a wonderful carb, but don't discount the good ol' Stromberg! I'll see if I can find some of my older diagrams of them that explains a bit of the process.
              John
              I'm so far behind, I think I'm ahead

              Comment

              • #8
                Re: Carburetor?

                Originally posted by N96337 View Post
                Charles,
                Part of the common problem with the Stromberg carbs is that they're a bit misunderstood. By the very design of the carb, it is already doing some of the mixture work for you automatically, so people don't see the "standard" behavior that they expect, and assume that the carb isn't doing it's job. The Marvel is a wonderful carb, but don't discount the good ol' Stromberg! I'll see if I can find some of my older diagrams of them that explains a bit of the process.
                John
                John,
                I do understand how they work and I know that it is doing its automatic thing. My difficulty is knowing when I have it adjusted to its peak performance. I think the vernier control will help me in that regard, so I am going to try that.
                Thanks,
                Charles

                Comment

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