ZONES89RS

iTrader: (25)

Well, i spoke with Dan Davinci, he told me to bring my two carbs by and he would go with what would work best between the two, but he told me that there should be no carb stumble at all weather it was a SBc or a LS base engine. So, when i get a chance, i will bring them to him and let you guys know what he did and did not do to make the controlled fuel leak work as well as it can.

Will surely post any gains in power from the next trip to the eight mile as well.

NemeSS

iTrader: (127)

cool. wonder what he will do to correct it or improve it

LS_10

iTrader: (1)

what kind of carb are you running? I have AED 750HP-HO bought it new and no issues yet...Hopefully it stays that way lol

danbap

iTrader: (6)

what 2 carbs do you have?

ZONES89RS

iTrader: (25)

I have 2 Holey base pieces:

1) Pro form main body, stock metering blocks, 4 corner mixture screws, quick fuel base plate.

2) Pro form main body, HP metering blocks and base plate, 4 corner ect.

stinkybutt

I'll bet 31 squirters for starters. If you have a stumble when going up 100-200 rpm slowly below 2,000rpm like driving in traffic sometimes a 1/4 turn on idle screws out, or smaller idle air bleeds. What you are getting is a lean transition. That single plane intake needs extra fuel to carry the engine until the main sercuit can start flowing fuel. If you are getting the lean stumble after 2200rpm you should try to go up 2 jet sizes in the front. Also the power valve # and power valve restrictions come into play here.
If the stumble is when you move the peddle quickly it's squirter size. Also pump cam tuning. Sometimes adding the bigger 50cc pump on the rear helps.
Don't forget that after 31 squirters you need a hollow screw.
Aleck

ZONES89RS

iTrader: (25)

Right now, it is only when you stab it WOT in neutral, it stumbles pretty bad till it gets into the higher revs, but rolling into it quick, it is fine. In gear, a WOT stab while rolling just goes, bust the tires loose 1st, 2nd, part of 3rd.

hifi875

iTrader: (2)

do the 50cc pump. i had the same problem. fixed it.

overhere

iTrader: (2)

primary? or secondary? both?

ZONES89RS

iTrader: (25)

Some say the 50cc on the primary helps.

xpndbl3

iTrader: (23)

40 squirters and 50cc primary here, no stumble at all

danbap

iTrader: (6)

what pump cam?

bigmandengo

iTrader: (21)

Do they make more than the brown and tan cams for the 50cc?

xpndbl3

iTrader: (23)

there's only two for 50cc pump shots. Whatever comes in the kit

bigmandengo

iTrader: (21)

I think one is for the primaries and the other is the secondaries. I dont think they're interchangeable.

hifi875

iTrader: (2)

primaries for me. i don't knowwhat squirters i have. its a stock 670 street avenger w/vacum secondary

xpndbl3

iTrader: (23)

they are but he was asking about pump cams....thanks for trying though

overhere

iTrader: (2)

i think he ment, that the "brown" is only for the front and "tan" is only for the secondaries or vise-vursa.

xpndbl3

iTrader: (23)

i don't know anyone with a 4150 carb that has dual 50cc pump shots. That's a ton of fuel getting dumped at the hit. Some of the bigger tunnel ram BBC big cube dominator motors might run them from what I've seen at the track, but I can not ever recall seeing it on a 4150.

bigmandengo

iTrader: (21)

That's what I was saying, but it's irrelevant.