hello.

I recently changed my cam, heads, intake, and various other things that threw my setting way off.

im running a vic. jr. intake, Isky mega 292 cam, 10:1 compression, and 200cc/64cc aluminum heads....

my question is this, my carb is a stock street avenger 770cfm. i want to rejet and valve it to get it right, im just wondering a starting point as far as sizes are concerned, i assume this is a relatively common setup (or close to it).

i know how to jet, im just asking for time savings as i have not built a motor quite like this before.

also, i am not in over my head, just entering slightly different territory.

thanks, Jeff

 

What test equipment will you be using?
WidebandO2? or accelerometer +plug reading?

 

Starting point, the Holley tuning sticky:

https://www.thirdgen.org/forums/carb...ey-tuning.html

 

actually the starting point is the set of 65 jets in my carb that dont allow my car to idle, i was just asking for a ballpark estimate based on other setups so i wouldnt have to buy the kit.

im asking to save time and money. i know how to jet, i just have VERY limited funds and would like to limit the amount of jets id have to buy.

im not trying to learn how to jet, i know how.

and as far as equipment, just my ear, a vacuum gauge and a tach. i dont have enough money for anything else right now. but if anyone wanted to bring a wideband over, id buy them a sandwich.

 

Jets don't affect idle.

The sticky tells you how to get it to idle.

 

the power valve does, i dont want to get pissy, but this isnt helping me.

i was looking for someone with the same combo to see how they have ti setup. im well aware of the right way, but i dont have enough money right now for that.

 

There's an idle circuit, transition circuit, a primary and secondary circuit.

What do you feel is causing your engine not to idle?
If you think it's the mega-cam causing the PV to kick in too early and messing up the idle then you should probably get the PV that activates the latest ( with the least amount of vacuum).
I think I would plug it off and get the engine to run well first before continuing.

 

No, it doesn't.

The least expensive way is the right way. The chances of someone having the same combo are slim, and the chances of their information being useful to you or saving you money even less so. For starters, most people with that sort of engine would have a DP, not an SA.

You can set the float and idle without spending any money. There's about a 95% chance of that fixing your idle problem.

 

it does when its open at idle. this carb is a few years old when i had a much different setup. the floats are set already. im waiting on my friend to get home this weekend, he happens to have the power valve i need sitting in his basement.

 

There is no flow through the main circuit at idle. The PV can be open, but there isn't enough airflow through the venturi to pull fuel through the main circuit. So, the PV does not in any way affect idle in a properly adjusted carb.

If the carb is so maladjusted that the throttle blades are open enough to start flow through the main circuit, it's still not the PV's fault.

The PV does not affect idle.

 

Bare in mind this is the FNG talking, but I would check to make sure your timing and everything else is spot on before screwing with the carb.

 

Good point. While not mentioned in the sticky, you'll hear us saying all the time here to make sure your problem isn't caused by ignition before messing with the carb. With more cam, you often need more ignition advance at idle.