<VV> Carb Rebuilding (added...Fuel Efficiency)

[Mikeamauro at aol.com]

"...The lower the float level, the leaner the high speed mix. Do not  apply 
pressure to the needle in the seat when doing this  adjustment..."

 
Actually, checking using wide-band instruments, I've found float  level comes 
into play a lot earlier: from just off idle transition, and  throughout the 
mid-range. Nearing WOT, I'm sure the fuel level pays a part, but  with fuel 
enrichment circuit equipped carbs, once enrichment kicks in, it's a  little more 
difficult to separate out what can be attributed to float  level, and what is 
enrichment. By tweaking (lowering) the float levels,  I've been able to 
maintain (at around town & cruse speeds), between 14  to 15 A-F ratio. The car I've 
done this with is a 110 with PG and dual  exhausts. I've installed in-cockpit, 
dual wide band digital instruments (by  Innovate), so I can see what is 
happening under all conditions,  side-to-side. Before float tweaking, even after 
reducing jet sizes to  under OEM speck, I could never get the system to run 
leaner than about  13.5. This speaks to the fact that jet size is most influential 
under WOT  conditions. Another thing I'm trying, to lean things up a bit, is 
to make  the enrichment needles a little heaver: I've filled the depression in 
the tops  of the needles 1/2 way with soft solder. OBTW: this and all my 
other  Corvairs are Safeguard-equipped. If you do not have a Safeguard, or Clark's 
 knock sensing device, be extremely careful in your leaning attempts.
 

Mike Mauro



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