<VV> Variant 140 secondary

[BobHelt at aol.com]

Hi Stan,
Apparently nobody has responded to your questions, so I'll try to.
I am not sure i follow your explanation but it sounds like you may not have 
 stock secondary carbs there. That cross-pin and ball were used as I 
remember on  the very early carbs for 1960 or so. I don't know what you mean be 
cut area. But  anyhow you should try to have active accel pumps working on the 
secondary carbs.  The pump should push fuel out from the bottom of the 
well, past the ball check  and dump fuel out of one or two very small holes on 
the side of the venturi  barrel. But you may have to have the cover installed 
on the carb to have this  happen. The enrichment circuit is completely 
separate and is not present on the  stock secs, so if you have that on your secs 
you have the wrong carbs.
Do any of your carbs have a tag with part numbers?
The enrichment circuit has a separate needle valve under the venturi  
cluster only on the primary carbs that allows additional fuel to flow into the  
main well
 
Regards,
Bob Helt
 
In a message dated 9/11/2009 10:26:17 A.M. US Mountain Standard Time,  
stan at fnal.gov writes:

I have  read about the accel pump in secondaries. Some say yes, some 
say no. Don't  know what to do there yet. My base seems to have the 
circuit in it that  allows gas to flow from the accel pump area into the 
next vertical hole in  the base. I think you call it the power enrichment 
circuit. Anyway, on my  base that next hole has a small metal ball, 
spring and t-shaped brass part  to hold it in the hole. The hole has a 
nice machined hole in it near the  top of the base to allow fuel to 
proceed into the venturi area. It also  has a very thin, small cut on the 
base where the top half would meet the  bottom half, just above the 
machined hole. This seems to allow even more  fuel into the venturi. I 
test assembled the carb with a accel pump  installed with rubber cup and 
put gas in it on the bench. When you operate  the throttle, gas comes out 
of the cut area. If you operate the throttle  quickly, gas come from both 
the cut and the hole below it. Both my bases  have this ball,spring and 
cut. I don't know about the primaries. I hope I  described this well 
enough to now ask the question. I don't see the  ball,spring and t-shaped 
part in any carb kit or carb parts list in Clarks  listing for carbs 
parts. The part that seems to be shown that does go in  this hole is a 
plain brass needle valve.