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cffd(at)pgrb.com
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 Posted: Mon Dec 17, 2007 9:34 pm Post subject: Rough engine |
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Remember I complained about my 2200 running rough at WOT with much soot in exhaust pipes. On the ground I opened the wing tank valve (no pumps at all) and gas poured out of the carb. (I am going to replace the float needle with the one that has a stronger spring built in. The orange tipped needle spring takes about 2 oz to depress it about 1 mm, the stronger black tipped needle takes about 30 oz to depress it 1 mm.) With the carb bowl off, it takes very, very little pressure on the old needle to stop the flow.
I got to thinking maybe the float has taken on fluid. I weighed it at the post office and it measured to be 0.4 oz. Bing factory says my white float should weigh 10 grams or about 0.35 oz. (The scale only showed tenths of oz.) So I suspended the float in a bowl of gas with a wire through the hinges. With the float level, only 6 mm of the float was out of the gasoline. This appears to me that the fuel in the bowl must be this high before the float can apply pressure to the needle. The fuel is supposed to be ½ in below the bowl lip when not on the carb, it will be a bit higher when the float is in it, but not that much higher. I am going to let the float "dry" out and check it in gas again. More later.
Chuck D.
N701TX
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Jeyoung65(at)aol.com
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| Posted: Tue Dec 18, 2007 6:49 am Post subject: Rough engine |
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Chuck, A manual for your carb will tell you how to adjust the carb fuel level. Most carb. have a tab (section) that you bend so the valve will stop fuel flow into the carb when the fuel level is at a given point. This level of the fuel effects the fuel mixture so it is important and must be set right. Sounds like yours is way off or the valve is leaking ( not seating ). Jerry of GA
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