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  #11  
Old 05-29-2020, 07:25 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,298
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Quote:
Originally Posted by pilotmansam View Post
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?
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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Last edited by lr172 : 05-29-2020 at 07:29 AM.
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  #12  
Old 05-31-2020, 07:51 PM
pilotmansam pilotmansam is offline
 
Join Date: Apr 2011
Location: Newberry, SC
Posts: 65
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Thanks for everyone's input. Yes, there are a lot of variables, but sometimes if you have a problem someone else has had it too. I guess it just shows me how important proper air flow into the carb can be. If I ever figure it out completely, I will do a follow up here.
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RV-6A N7228Z
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