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Re: [T3] hesitating, fuel supply?


On 2 Sep 2002, at 23:25, Steven Ayres wrote:

> JimA=> 1.5 psi against the area of
> => the float valve won't make any discernable
> => difference.
> 
> We've talked about this before, of course. I still think there's a factor
> being missed -- we're dealing with *two* float valves in the system, not one
> as on a Type 1. Fuel pressure makes a clear difference on my car.

I guess I can't argue with your results, but I'm at a loss to explain how they 
might have come about.

The only question here is how much effect a 1.5 psi pressure increase will 
have on the float level. I suspect that the area of the float valve is about .01 
sq in. so the additional downward force on the float is ~.015lb. Considering 
where the valve is with respect to the float pivot and the float's center of 
bouyancy, I'd say there is a mechanical advantage of about 5 on the float 
valve, so the equivalent additional downforce on the float is ~.003lb. I 
calculate that to be about 10 gms

That's the force that would be required by additional depth in the bowl as a 
result of the increase in pressure.

What this means is that there would have to be 10 gms of additional gas in 
the bowl. This is a significant amount, so I guess I'm convincing myself that 
this effect could be significant.

Someone with a float and float valve in front of them should be able to make 
a better measurement of the float valve area and the mechanical advantage of 
the float on the valve. My numbers were just rough guesses, so I'd be 
interested in working thru this with better numbers.

-
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

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