so i tore my barry grant carb apart...

[vector1]

thanks for the link. i see now how they do it, using the spring to keep the screw from moving, how does the screw look though, i wonder if it has a notch up the side to vary the air flow.

on second thought, i bet it is the spring that regulates the air flow. compressed no air flow, expanded flows more air.

[Gaz64]

No, the four milled slots in the top of your throttle body feed filtered air to the central bore below the aircleaner stud.

The "valve" has four holes on it's perimeter, which allows the air to enter the centre which has a blunt tapered screw residing near it's seat.
It's a simply an adjustable bypass to allow idle speed adjustment without touching the base idle setting of the throttle butterflies.

Best idea for 4 barrel carbs yet.

Pity QFT doesn't offer it.

[vector1]

Originally Posted by Gaz64

No, the four milled slots in the top of your throttle body feed filtered air to the central bore below the aircleaner stud.

The "valve" has four holes on it's perimeter, which allows the air to enter the centre which has a blunt tapered screw residing near it's seat.
It's a simply an adjustable bypass to allow idle speed adjustment without touching the base idle setting of the throttle butterflies.

Best idea for 4 barrel carbs yet.

Pity QFT doesn't offer it.

i see. i was thinking something like a screw used for the squirters on the carb, and the brass fitting looks very similar to a fuel jet. since bg is tits up i might have to try and rig something up, plugged right now.