Holley/Demon Carb stumble
so nobody responded about the float spring......No big deal??
I thought it was a little odd especially if it affects the dry setting. see post 439.
To add to that. IMO the fuel level should be the controlling factor.
With big window bowls, middle is is the baseline and it seems like the bottom is about as low as one would ever adjust it.
Question is why does it need to be that low?
Maybe my brain is still foggy in the morning. But when especially when setting wet, a stronger spring or weaker spring should not affect the end result.
Not many inlet systems can hold steady much above 6 or 7 psi.
The larger the valve, the more difficult it is.
Lets say the needle was a circular face.
.110" diameter = .0095 sq. in of surface area;
multiply by 9 lbs/sq in => .089 pounds force trying to push the valve open.
multiply by 7 lbs/sq in => .067 pounds force trying to push the valve open.
multiply by 4 lbs/sq in => .038 pounds force trying to push the valve open.
.130" diameter = .0133 sq. in of surface area;
multiply by 9 lbs/sq in => .119 pounds force trying to push the valve open.
multiply by 7 lbs/sq in => .093 pounds force trying to push the valve open.
multiply by 4 lbs/sq in => .053 pounds force trying to push the valve open.
Knowing that Holley considered 7 psi about the limit its floats and valves could control, and that 110 were about as big as typically offered for gasoline, .067 pounds is probably about the limit of what a float can push back against and really hold it shut.
(A longer arm will give it more leverage, and there are some different lengths available for when that's needed.)
Maybe it is holding steady at 9 psi while parked, but when the fuel is sloshing around a little that could be enough to cause the valve to crack open when the fuel level hasn't really dropped.
Just maybe that is the answer to the question:
With 9 psi in the feed lines, setting the fuel level in the bowls low at idle got closer to correct level under different conditions.
???
To take it further, the delivery issues you guys were discussing last night might result in inadequate refill down the track at WOT.
???
