Idle mixture question-which way is which

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Apr 5, 2003 | 10:29 AM

hudman

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Racer

Joined: Aug 2001

Posts: 473

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From: Raleigh NC

Idle mixture question-which way is which

Which way do you turn the idle mixture screws to make richer/leaner?

I have a Edlebrock Qjet replacement, 750 cfm, model 1901 (if it matters)

Apr 5, 2003 | 10:42 AM

Larry B.

Le Mans Master

Joined: Sep 2000

Posts: 5,635

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From: Orlando Floriduh

Re: Idle mixture question-which way is which (hudman)

Turning the screws clockwise leans the mixture. There are other factors that affect the idle mixture too.

Apr 5, 2003 | 10:43 AM

Ganey

Race Director

Joined: Apr 1999

Posts: 11,520

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From: CORVETTE 77 385 C.I. TEXAS

Re: Idle mixture question-which way is which (hudman)

Out - richer
In - leaner

It's a needle screw.

Apr 5, 2003 | 10:46 AM

Dalannex

Safety Car

Joined: Mar 2000

Posts: 4,078

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From: Northeast South Dakota

Re: Idle mixture question-which way is which (hudman)

Screw them in (clockwise) for leaner, out (counterclockwise) for richer. They are just a tapered needle valve that controls the amount of fuel that goes in for the idle circuit, so running them in pushes that needle farther into the seat, causing less fuel and a leaner idle.

-Justin

Apr 5, 2003 | 10:49 AM

Garson

Racer

Joined: Apr 2001

Posts: 391

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From: Bend, Oregon

Re: Idle mixture question-which way is which (hudman)

Righty - Tighty. Turn the idle screws right or clockwise to lean out idle or left or counterclockwise to richen. I like to use a vacuum gauge to set the idle. Find a full vacuum port to attach the guage and set mixture screws one at a time to obtain the highest vacuum reading. Be sure to adjust each screw the same amount. (If one screw is one and one half turns out then the other should be one and a half also)

garson

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