Factory carberator

[bradartigue]

It was verbose brad... but we've learned you're a fiddler!

Thankfully I'm better with fiddling on carburetors than fiddling on fiddles. I'm a horrible musician.

[MrJD]

So lets get this really simple:

If I run a synchronous 38mm carb on a relatively stock engine, it will have potential flat spots and issues with acceleration if you just "floor" it off the line.

What causes this to be the case?

[fiat218]

So lets get this really simple:

If I run a synchronous 38mm carb on a relatively stock engine, it will have potential flat spots and issues with acceleration if you just "floor" it off the line.

What causes this to be the case?

I'd have to say your flooding the engine . But what would I know
From what I read, u have to ease off the line with accelerating, so that tells me there to much gas at one time, but when you are going then kick it
We will see if I'm right

[MrJD]

Well, it is one way or another. When the throttle opens either too much or too little fuel would enter the cylinder when "bogging down."

If too much fuel, changing jets could alleviate this transition issue.

If not enough fuel, it is due to a lack of vacuum due to the large area and relatively small intake needs of a fiat TC.

[bradartigue]

So lets get this really simple:

If I run a synchronous 38mm carb on a relatively stock engine, it will have potential flat spots and issues with acceleration if you just "floor" it off the line.

What causes this to be the case?

That carburetor allows you to set the point of secondary opening, it does not have to be synchronous. It is a waste, really, to have it fully synchronous because you're going to have to jet down to even drive it at middle speeds. I'd seek out an ADL and not bother with the DGAS personally.

[MrJD]

Just an aside... If you have a carb that has been sitting for eternity, no cracks in the aluminum... its there just dusty and covered in oil.

The question is, can basically any carb be re-built or is there some event where the carb has to be thrown out?

[bradartigue]

Just an aside... If you have a carb that has been sitting for eternity, no cracks in the aluminum... its there just dusty and covered in oil.

The question is, can basically any carb be re-built or is there some event where the carb has to be thrown out?

Depends on the carb; really cheap Webers - 30DIC for example - don't have bushings or bearings, the shafts are press-fit into the aluminum. When they wear out, the carb is junk. Webers that have been used in harsh conditions (i.e. dune buggies and IDFs) often are untunable because the throttle plates don't sit correctly and the barrels are worn from inhalation of crap and poor air filters. Webers that have been "rebuilt" by mechanics or owners often were overtorqued/scratched up to the point they can't be calibrated.

DCOEs, DCNFs, IDAs, IDFs, in general all of the high performance carbs are rebuildable so long as the bushing or bearing seat hasn't been damaged by heat or stupidity, as are the ADxxx and most D series (some are complete garbage, as mentioned above, but some are not).