Holley Street avenger carbs? Is the air/fuel mix screw on the side just for idle??

[badmix]

The instructions dont really say, but thought someone said on here that its just an idle circuit or does it effect the air/fuel thru the whole RPM range.

thanks

 

[rcamacho]

The idle screws on a standard Holley carburetor control mixture only at curb idle. Some emissions legal Holley carburetors have what's known as a "reverse idle" which controls mixture through ~2000RPM where the main circuit takes over - not applicable to the Street Avenger series.

 

[blazindorito]

YEs the screw on the side next to the throttle linkage is just for idle.

Although on the opposite side you have the control module which adjusts the opening and closing of the choke. Behind that is the air/fuel mixture.

What are you trying to do?

 

[badmix]

I was tuning the carb today and was just thinking about it. I adjusted my timing last week and then messed with the carb, when I set the carb, my idle was low. I lived with it for a week and then just added a lil fuel via the side screws on both sides of the front bowl. I brought idle up a couple hundred RPMs to where im happy. But just wondered if those screws only effected idle or the rest. I tune my carb using a vacuum gauge. Ive got timing set at 10degrees advanced and want my vacuum around 17 (what ever they read . lol)

 

[hawkins]

The screws on the side are for idle mixture. For the rest of the mixture your jets and metering plate on the secondary side control fuel. Your accelerator pump can be tailored for enrichment for off idle accceleration via quanity and timing. Then there are the air bleeds in the main body that finely tune the mixture by allowing air into the circuits. Those are not adjustable unless you drill them out and tap them for that purpose and only demon carbs come that way (racing). Then there is also the power valve which opens at a specific vacuum for fuel enrichment. Those are interchangable but usually you stay with about a 6.5. Oh and you have a spring and diaphram for the secondary opening timing. Once again usually in heavy trucks you use the black spring for a very late opening. And btw if your carb is adjusted right you should have a very smooth transistion when the secondaries open up. Any one that says you should "feel" them kick in hasnt had a properly adjusted carb.