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davestapa(at)juno.com
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 Posted: Sun Nov 19, 2006 1:34 pm Post subject: Bing Carb Overflow |
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I just got back from the airport taxi testing my 5 with a 912S. When I
shut the engine down the left carb overflow drips fuel, probably little
more than a couple of table spoons full. Right one is fine. (I also have
the spill pans so not dropping on anything hot). I was wondering if
anyone has an idea at what to look for. Haven't torn into the carb yet.
The engine has about an hour on it. Any advice would be appreciated.
David Estapa
Woodstock, GA
N97DE S5 TD
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experimental208nd(at)comc
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| Posted: Sun Nov 19, 2006 8:15 pm Post subject: Bing Carb Overflow |
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That allways happens to me if I take the bowls off to clean them out. You
just have to make sure the floats are seated just right in the bowl as you
put the botom back on. Run it and see if you got it, if not try and re seat
them again.
Usually works for me anyways.
Hope it helps
Jay Fabian
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barry(at)pgtc.com
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| Posted: Mon Nov 20, 2006 2:56 am Post subject: Bing Carb Overflow |
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David, I went through this off and on for more than a year before the
problem was resolved. The model IV has the intake manifolds reversed so the
carbs are further outboard than usual. I asume the model V is the same.
Mine was an older 912 S. The problem was the result of the rather violent
shaking on shut down, exagerated at the carbs because of being so far from
the center and also because of the higher compression ratio of the engine.
At times the overflow would occur during idle and the fuel would actually
foam in the bowls and continue to overflow.
The problem could usually be temporarily solved by adjusting the throttles
and idle mixtures, but it kept coming back. Finaly, I sent the gear box to
Lockwood and they adjusted the sprag clutch which reduced the shaking at
shut down and I have not had that problem since. I have nearly 500 hours
on the engine now. I believe later engines already have the proper
adjustment.
Of course the problem could be due to the float level being not right. It
would be a good idea to remove the bowl on the carb that is overflowing and
be sure that the arm that supports the float is level with the bottom of the
carb. This is somthing that can change with time.
I strongly reccommend you call Lockwood and discuss this with their tech
guys.
Barry West
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