Quote:
Originally Posted by pilotmansam
I wanted to post a follow-up on my issue. I finally decided to just re-install the old FAB. It uses the same filter as the new FAB. Went flying today, and the problem has disappeared. Now when I pull the throttle back there is no tendency for the engine to get rough without leaning.
So, I solved the problem, but why? Who knows?
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without seeing the two FABs, I don't have much to offer other than I would be looking for something that cuases turbulent air at the opening of the carb throat at the FAB. If the air becomes very turbulent at the throat, it can disrupt the metering of fuel at the main jet, in the venturi. Some older M/S carbs had the vent for the main metering channel in a bad spot that was susceptible to turbulence in the FAB and it was later changed. Turbulent air in the FAB would cause irregular fuel metering. You will find an old article on this and a fix in the RVator series. Mine old carb had this and I drilled a new vent and JB welded up the original hole.
Larry
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N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Last edited by lr172 : 05-29-2020 at 07:29 AM.
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