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AFB and MPG (or is it GPM?)

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  • #16
    Did it run okay before and start doing this, or has this carb always done that on this engine?

    I would check for a heavy/leaking float and sticking needle/piston too.

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    • #17
      The AFB is a good carb that can be tuned to run very efficiently. Since it is running rich, First make sure that the power pistons that push the metering rods into the primary jets are not stuck. THere is 2 little covers on the top of the carb with 1 screw on each. Loosen the screw, then swing the cover to the side. The power piston and metering rod assembly should pop up. If it dosen't pop up out of the hole, it is stuck, and the carb will run rich.
      THe other thing is that if you don't know what jets and metering rods it has, you need to find out. To optimize the carb, you need to know what your starting point is, then go thru the process of testing and establishing the best primary and seconday jets, metering rods, and step up springs.

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      • #18
        Originally posted by Hemi Joel View Post
        The AFB is a good carb that can be tuned to run very efficiently. Since it is running rich, First make sure that the power pistons that push the metering rods into the primary jets are not stuck. THere is 2 little covers on the top of the carb with 1 screw on each. Loosen the screw, then swing the cover to the side. The power piston and metering rod assembly should pop up. If it dosen't pop up out of the hole, it is stuck, and the carb will run rich.
        THe other thing is that if you don't know what jets and metering rods it has, you need to find out. To optimize the carb, you need to know what your starting point is, then go thru the process of testing and establishing the best primary and seconday jets, metering rods, and step up springs.
        good advice here. Edelbrock's website has info and calibration kits.
        BS'er formally known as Rebeldryver

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