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Re: [T3] Update on fuel pump adjustment


on 22/1/2003 4:28 PM, Jim Adney at jadney@vwtype3.org wrote:

> This MAY be the whole difference. The whole pressure thing is dependent on the
> area of the float needle valve that is exposed to the pressurized gas. Since
> the float valve is a circle and its area is proportional to its diameter
> squared, to make everything work out the same in the end you would need
> greater 
> pressure in proportion to  (1.5mm/1.2mm)squared. This works out to 5.5 psi,
> which isn't half bad.
> 
> Still, I have no idea why they thought it would be a good idea to change the
> float valve sizes. Keeping them the same would have been a much simpler
> solution.

I think the float chamber is smaller than beetle carbs, so the floats are
also smaller, perhaps that is why they made the valves smaller as well?

Ben Doughney

'75 1200L
'63 1200 - Ringo
'71 1600TL

http://members.tripod.com/~superkafer/ 


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