Posted by Owen Aaland on October 28, 2009 at 20:10:25 from (207.13.114.170):
In Reply to: 574 runs lean posted by chadd on October 20, 2009 at 16:32:59:
A.D. said: (quoted from post at 19:43:23 10/28/09) As a follow up, I had installed the venturi and it's seating ring upside down.
The the venturi's big end goes up towards the manifold, and the seat ring will have to be flipped on the fuel bowl so it will bolt back together properly.
I've seen that happen before. The way you can always be sure that the venturi is in correctly is the part with the smallest inner diameter will always be where the main fuel jet ends. That puts the lowest air pressure at the tip where the fuel is drawn out.
At full load there is very little manifold vacuum. The decrease in size of the venturi causes the air to have to move faster at that point lowering the air pressure enough that atmospheric pressure on the fuel in the fuel bowl pushed the up the jet.
At idle or light loads there is enough manifold vacuum so the venturi is not necessary but without it the fuel flow will drop off just as the engine needs more. By using the choke you can create a vacuum in the manifold allowing the engine to still draw fuel out the main jet.
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