This probably sounds ridiculous, and it probably is, but I can't find any info on quick fuels adjustable vac. secondary......which way is which on the adjustment screw and what is a "standard" setting?

 

Huh??

The only 'adjustable' vacuum secondary setup I know of on a non-AV carb is Holley's quick change kit, which is quite a simple thing.

 

QFT-63-1


QFT-Q-750-PV

 

Come on, Air, get with the program! Quick Fuel did the right thing and put a needle valve in the vacuum signal to the secondary diaphragm.

In is clockwise (no, don't look at your digital watch to figure out which way that is), which delays the opening. Out is counterclockwise, which increases the signal.

I forget what the standard setting is, but it isn't much. Try one turn out and go from there. Or, 4 turns out and keep turning it in until it quits bogging. Or, I can check mine in the garage attic when I get home tonight and get back with you. I haven't used it since 2003.

Remember, if you can feel your secondaries opening, you're bogging.

 

Thank you thank you thank you.......That's what I thought but wasn't sure. It's leaning out in the upper range and I just want to get the secondaries right so I can tune the damn thing. I really can't feel them open at all at 31/2 turns out so i'll put that screw in a couple more turns and see what happens .

 

That adjustment only changes the opening rate of the secondaries. It does not change the mixture ratio - that's jetting.

Curious why you went with vacuum secondaries when spending that much on a carb.

 

Yeah I knew it only adjusted the opening rate but I couldn't tell when they were open so it was making jetting difficult...as to why I picked vacuum sec. was because this was a street car and blasting out of corners can be difficult when the tires are spinning