Cliff's Quadrajet Parts and Rebuild Kits

General Category => Quadrajet Carb Talk and Tips => Topic started by: Paul on February 23, 2011, 03:52:28 PM

Title: Idle bypass air
Post by: Paul on February 23, 2011, 03:52:28 PM

I have been reading Cliffs book and I would like to know how idle bypass air works, does it ad just air or fuel, or a little of both? Thanks

Title: Re: Idle bypass air
Post by: Schurkey on February 23, 2011, 08:40:06 PM

Quote from: Paul on February 23, 2011, 03:52:28 PM

I have been reading Cliffs book and I would like to know how idle bypass air works, does it ad just air or fuel, or a little of both? Thanks

Air only.

Fuel comes from elsewhere.

Title: Re: Idle bypass air
Post by: Cliff Ruggles on February 24, 2011, 03:51:25 AM

It's basically a precisely controlled vacuum leak, down each side of the carb.  This allows the engine to get more air with less throttle angle. 

The system, when used correctly keeps the main system off line at idle speed and eliminates any "nozzle drip".

It works well with big cammed/low vacuum at idle engines. 

It does not make up for not having enough idle fuel available to the mixtures screws, so don't expect it to cure "nozzle drip" unless the carb is correctly set up for what it's being used on.....Cliff

Title: Re: Idle bypass air
Post by: Paul on February 25, 2011, 08:54:25 PM

Thanks. I am exited about rebuilding the carb acording to the recomendations,