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Author Topic:   KP, more on quadrajet asperator channel
posted November 05, 2003 10:14 AM
thanks for the reply kp.
about the asperator channel, on page 10 of that book, 2nd paragraph it says ...

the venturi controls the main metering system by governing the fuel
discharged into the point of lowest pressure or greatest vaccum. this
minimum pressure point supplies a signal to the main metering system. the
pressure drop signal to the main and power systems via an asperator channel.
the channel is plumbed from the point of greatest depression in the
boost venturi on an upward angle to the vertical fuel pickup. the channel
in turn get fuel from the main and power systems.

is there a real physical channel or are they talking about the path fuel
travels from main fuel well because of the vaccum?

I cannot seem to locate the physical channel.

posted November 05, 2003 10:37 AM
That "channel" is the fuel circuit or port that feeds fuel out of the booster venturi itself. What I believe he's talking about is located in the center of the booster venturi - an outlet where the fuel is drawn from the main wells.

And just out of curiosity, why are you focused on that? Unless heavy modification is done to many other things, I've found very little measurable gains in altering the size of that circuit.
There's definitely gains to be had in modifying the emulsion capabilities and fuel feeding points on the secondary side, however.
Not to mention alterations to the idle fuel restrictions, and main well capacities.

Hope that helps,

posted November 05, 2003 02:25 PM
since you asked why KP, ... i have done most of
the modifications that i found in a quadrajet internet article by Randy Frazier, along with
a few more i figured out for myself.

this led to an awesome, bogless, great throttle responding carburetor and a track championship. I'm ready to take carb modifications to the next level and i saw
you mentioned the doug roe book.

just reading through doug's book and trying to understand everything he is talking about
before doing some of his suggested modifications.

thanks for all the replies.

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