Carb question
Turbo Mini Forums

Anybody know what the hose is for that seems to run from the plenum side of the carb to the butterfly side?

Is this the one that you mean?

If so, it's the part-throttle lean off pipe.

In the 13's at last!.. Just

That is indeed the one. Anybody understand its operation?

at part throttle, it creates a small amount of vacuum in the floatbowl, via restrictions in drillings in the carb, to help lean cruise mixtures.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

It created a misfire issue with my car. A lot of people would advise you to block it off.

In the 13's at last!.. Just

Thanks guys! :)

I blanked mine off at one point seemed to run better

mine ran lick crap when i blocked it off. then again everything i do seems to have an adverse affect

Mines blocked off and ran fine.

if you want the best of both worlds stick a solenoid in it, then you can try either.

I cant see any reason why it would cause running problems if the carb is set up right ? and the air bleed hole into the chamber from the plenum isnt blocked.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

if it splits or leaks it can cause a problem, so on my car where off throttle economy is not important, its safest to blank it off.

Like the challenge carb, blocked off. Theres also a balance pipe fitted, god knows how it works though.