IDA Air Flow Between Barrels Way Off?

[*13*]

There is no other adjustment on the bottom of the carb. This may be a newer development in the 48IDA. I bought mine new a few years back. I wish there was. Would be nice to be able to adjust the air.

[racco]

that adjustment will make the car idle so much smoother that it will now with the idle number all over the place. Which air flow gauge are you using?

[*13*]

Just the Vacuum in the horn Gauge. It's pretty consistent. I hear the older versions were terrible. My car Idles fine. The barrels aren't off by much. Being nit picky, I'd like to see them exactly even though.

[racco]

Get yourself the air flow gauge from pierce manifolds it looks like a snail shell (dont recall the brand name) and it sits in the barrel. It will give you exact readings. These cars have very lumpy idles and it may be difficult to notice if the balance is off. On a ferrari you can hear it from ten feet away.

[racco]

your correct ida's don't, idf's do, same basic carb body. Ferrari 365bb and 512bb use four ida 3's and they have the bypass screw.

[markha]

OK. I pulled them tonight and realized that I did a bit of a rookie move. These are all Italian IDA that I bought used from various places. In rebuilding them, I did not keep the butterflys with the same carbs. No big deal... right? Well tonight I realized that some of the butterflys had been drilled with an idle correction hole and others had not. So when I reassembled them, you guessed it, I wound up with some carbs with one butterfly that was drilled and one that was not in the same carb.

So now.... do you guys run these holes? These are small (about 1mm) holes in the butterflys at the opposite site from the progression holes. I have enough butterflys that have the holes to make them all the same, but with the idle so high, I am tempted to solders these holes up.

Thanks,
Mark