General Category > Quadrajet Carb Talk and Tips

Idle-system

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Marx3:
Hi, I was wondering; how far up through the rpm does the idle-system have effect on the mixture

Cliff Ruggles:
It's more about throttle angle and engine vacuum than rpm.  The idle system is described in our book, and how each part of it works, etc......Cliff

Toronado:
I heard idle sytem effects 0 through 60mph i do not
know if thats true, it sounded a little fast to me for the
idle system still effecting any thing much over 30mph.

Is there air and fuel still being feed from idle channels,
in tell a carb. reaches max rpm, mph, or vacuum (a ballpark number)?

Cliff Ruggles:
As mentioned, it's about throttle angle, and engine vacuum created at the front edge of the throttle plates than will cause fuel to be pulled from the idle mixture screw holes and/or the tranfer slots.  This will not be the same for any two set-ups, but I would imagine most would be feeding some fuel to the engine thru the idle system at really low throttle angles and when the engine is pulling a lot of vacuum....Cliff

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