Weber IDF Balancing on a Fiat 2ltr TC

[mack124]

Hello Guy,

When balancing a pair of Weber 40 IDF should the "Crankcase Emission Vacuum Tube" (That goes from the front barrels to the air cleaner) be blocked off or left open?

The reason I ask is, the …œHaynes‚ manual just says to remove the air cleaner when balancing carbs but I¢ž¢m finding I¢ž¢m having to screw out the …œAir Bleed‚ screw a very long way to compensate for the air that the "Crankcase Emission Vacuum Tube" sucks in.

I can¢ž¢t seem to find any information in any article written about IDFs that cover this little tube.

Theoretically speaking, if the …œThrottle Valves‚ were both properly aligned and sealed perfectly then the back …œAir Bleed‚ screws would have to be opened up to compensate. Is that correct or have I got it completely wrong.

Any light you can shed on this Guy would be fantastic.

THanks
Gill

[Guy Croft]

Blank them off Gill,

GC