ok i just found something that might have had to do with my light throttle cruising pig richness the right front corner hsab and iab were switched so that should have been making it richer cruising and leaner at wot right ? as i stated before the hsab 's wer tiny and the iab's were big but that corner was switched what do you guys think?

 

forgot to say it has a1000 fuel pump and the a2000 return style regulator with -10 feed and return lines with two -8 lines to the bowls not sure what the needle and seats are fuel presure is 6psi base and 1:1 referenced above the carb

 

Big carbs are hard to get fuel through! You will most likely have to up the front pvcr's to .080-.120's and put a high flow pv in. Vent tube extensions work wonders as well, really get more fuel to the motor! I also block the high speed air bleeds completely as well, they are put there to lean out the carb at high flow situations. Does the carb have annular boosters? If not that will also probably be needed.

I would suggest getting WOT right before trying to perfect the drivability. Once you figure out how to fuel it at WOT, then you can play with the math and lean out the main jetting and increase pvcr's to compensate.

 

i blocked off the high speed air bleeds at all 4 corners with 10-32 setscrews from lowes and when i started it it was so rich it wouldnt even idle i didnt even get to drive it so i put the tiny hsab's in it and it would idle good again but it still wouldnt let me lean it out more that mid 13's before stumbleing i am going to drive it tomorrow to see if switching the swapped right front corner air bleedes helped at all that makes since though because it fouls the 2 cylinders on that corner bad

 

The high speed bleeds are the middle ones, closest to the squirters. Those are the ones you blocked? The idle ones are outside edges. It makes no sense that blocking the high speed bleeds made it idle rich! Unless the throttle blades are opened so far it is pulling fuel from the boosters?

At idle the fuel should be coming primarily from the idle circuit and maybe a little from the front transfer circuit!

 

oh sorry i think it has annual boosters the secondary boosters are much bigger than the primaries i am not sure how to tell really i would have got a 650 cfm if i had a choice but this was a deal i couldnt pass up

 

how fast has the car in your signiture ran and what is some details on the setup if you dont mind

 

HSAB's are usually 6-32 or 8-32, sounds like you blocked your IAB's.



Put a .055-.070 IAB in it and get the transfer slots set to .020. Crank the idle mix screws in all the way then back them out 3/4 of turn each.

 

yeah i blocked the high speed air bleed i think that maybe the set screws i bought went down too far maybe ? they were a little longer than what was in it

 

just drove it with the only thing changed being that i sewapped the mixed up air bleeds on the right front corner WOT went from 13.8 to being 13.1 a/f so we are going in the right direction light throttle went from the 11's to being 13's so that is alot better too but it still goes to 11's when you back off the throttle driving normal is that allways going to be there or what?

 

ok i blocked the hsab's again but this time only turnded them in as far as the factors ones went and that fixed the super rich wont run problem i had before from screwing them in too far . it got my wide open throttle air fuel down from mid thirteens to high 11's so i am good there now but for some reason it still richend it up anywhere above 1/4 throttle and up it went from being mid 11's to being high 10's at 1/4 throttle. it went from being in the 14's at 1/2 throttle to being high 12's now . so my question is how do i get my light throttle cruising to 1/2 throottle in the 14's a/f ? is that what drilling out the iab's will do HONK IF PARTS FALL OFF ? if so i will try that , it idles in the mid 13's with all the screws run out to 3/4 turn i am ok with that thanks guys

 

With the high speed bleeds blocked it has more pull on the fuel through the booster. What jetting and pvcr's are you at? Now that the WOT is close, I would drop main jet on the front and increase the pvcr size accordingly to keep the a/f right at WOT. Also, what is the jetting front to back? The goal is to have close to the same fuel flow from front to back. If the pvcr's get above .070 each, you need a high flow pv.

When 1/4 throttle to 1/2 throttle, you are pulling from the main, transfer and idle circuit. If you increase the idle air bleed size it will lean it some, but probably not a ton since the bulk of the fuel is coming from the boosters. It also depends on if the pv is open or closed at these throttle postions, as to if it is enriching. With it already idling in the 13's, I don't think I would messing with the bleeds if it was mine.

 

it has .057 pvcr's main jets are 75's and secondairies are 90's my power valve is a 6.5 and it has like 20 in of vacuum at idle so it shouldnt be open but maybe i should check that or put a new pv in it , i have been afraid to drop the main jets because it seems small to me anyway , can the secodairy jets affect cruise a/f with the secondaires not being opened at cruise? thanks for the quick response

 

The rears "should" not be moving any fuel unless: there is boost pressure in the bonnet, increasing fuel pressure and bowl pressure (with vent tube extensions).

You will have to do some math to figure the size changes. Go find an area of a circle calculator and figure the total size of each fuel path (both pvcr's and both jets) in the fronts. Do a google search for holley drill chart to get the accurate size of the jets. Once you figure your total area for all combined. Start reducing the main jet size in the calculators and adding larger pvcr's until the flows are the same. You will most likely be in the .080's - .090's in pvcr's and in the very low 70's to high 60's on the main jet from the way it sounds.

To make it easier, I would put a 70 or 68 main jet in and see if the car likes it in the problem areas. (DO NOT GO WOT) Once you find the spot you like for normal driving, figure the math for the size of the pvcr's.

 

ok thank you i will try it