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  #1 (permalink)  
Old 07-13-2007, 10:32 AM
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Default Weber Emulsion Tube Help

Hello All,

I would like to know if someone might have a chart that describes the different characteristics of the Emulsion tubes.

I would like to see where the F7, F5, F16 tubes are as far as when they come in for the progression and if they are lean or rich,

Thanks
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Old 07-13-2007, 11:07 AM
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page 2 of the "interesting weber jetting thread by Eljaro has a diagram
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Old 07-14-2007, 07:11 PM
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Priobe,
Everything you will want/need to know is in the factory Weber Tuning Manual. Most Weber dealers have these for sale.
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Old 07-16-2007, 03:34 PM
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it goes more or less like this:
the thicker the emulsion tube the less space there is around it and the hole where it is screwed in, so less gasoline gets past it. This is what you want in order to improve the transition, which is usually very rich (black plugs).
You are leaning out the low transition with a larger diameter emulsion tube.
When the signal gets stronger at high rpm the air corrector has more impact.
A larger air corrector will lean the mixture and a smaller air corrector will richen.
Here you want to richen the mixture at high rpm.
The holes in the emulsion tube work like this: The air that is pulled through the air corrector jet passes through the holes in the emulsion tube out to where the gasoline flows out of the main jet into the aireation channel before being drawn into the aux venturi. The more air you allow into here, the leaner the mixture is.
If the holes are at the top, it will lean the mixture at low rpm during the transition. If the holes are at the bottom, the aireation will ocurr at a very strong signal, so it will lean out at high rpm.
So here you want the holes at the top: more aireation and leaner low transition.
This all works on a BB only with 40mm venturi (or larger, havent tried jet), otherwise there is not enough air and you will be screwing up with the wrong main jet and a terrible transition.
Got it?
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