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bringing my Cub soup-up thread to top
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Posted by R-cubed on November 25, 2005 at 10:15:02 from (68.92.84.105):
In Reply to: Re: Cub soupup? posted by Andy Martin on November 24, 2005 at 17:40:54: I meant to add, the velocity through the venturi creates the vacuum to draw gas into the air stream. Opening up the venturi just a little will result in lower velocity and less fuel pulled in, which more than negates any improvement in pressure drop to get more mixture into the engine. Opening the venturi up a lot will stop the carburetor from operating. I guess you could always try to run on the choke, but then you have that pressure loss again.
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What you say is true to a degree, but the air passage is about 1.00 dia and the venturi is .50". That means that only one forth as much air can get thru the venturi as thru the rest of the passages. It is not a Harley or Chevy small block but the same principles apply. I've opened it to .625 for a first trial. I can always bush it back down if I goof it up. It will probably need a little richer setting now. Carbs on European cars (SU and Weber) and cycles have very little venturi affect and still work though they probably get less mileage that way. Probably need to make the governor run faster too. I am trying to do this without tearing the engine down.
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