What carb is this?

[Flipsidefabrication]

Bought this 79 fiat, its suppose to have different pistons and 10-1 compression. I was going to do cams as my next upgrade. I was curious what carb this is so i know if i should rebuild this one, or upgrade to a larger one. Its a webber but i cannot find a serial # on it.

[manoa matt]

It appears to be the stock Weber 28/32ADHA " boat anchor"

[Daniel]

Putting Cams with that carb will end up with dissappointing results when looking at the venturies you'll see they
are a bit on the small side . A popular upgrade is to replace that carb with an ADF, bolts right on very simple it
has larger venturies .

[CajunMike]

The carb id numbers are on the base of the carb on the engine side. They may be dirty or greasy. Rub it with a rag or something and you should see the numbers . It should be marked with serial #s and an alpha numeric code. Probably either a 28/32 adha or a 32 adf.

If it's a 28/32 then all suggestions will involve upgrading the carb and intake for any additional engine modifications. Good choices for a single carb are the 32 adf, 34 adf, or 32/36 dfev. Get an intake from an 1800 engine too.

[vandor]

[quote="CajunMike"Probably either a 28/32 adha or a 32 adf. [/quote]

Only the 28/32 ADHA had the vacuum secondary. The large vacuum diaphragm is visible in the pics.

This carb will negate any other modifications due to its small size. While the 32ADFA form an 1800 bolts right on, it's barely any bigger. I would suggest a 34ADF or a 32/36DFEV.

[baltobernie]

If your engine is getting cams and other goodies, you might also consider the 38DGS. Before going much further, you should remove the existing carburetor, and look down the intake manifold throat. What you want to see is one large hole, denoting a "single plane" manifold. Much better performance with a upgrade carb.

[vandor]

and look down the intake manifold throat. What you want to see is one large hole, denoting a "single plane" manifold. Much better performance with a upgrade carb.

There is the Spider 2000 style EGR valve in the pic, so it is the original restrictive manifold. The only way it would be single plane is if somebody opened it up - I am not sure if that is possible?? I am sure it would be a lot of work.

[Daniel]

Yes he has the dual plane Manifold !

[Flipsidefabrication]

Is the most common place to find a single plane manifold off a 1800? Does anyone have one for sale? What is the best place to find a 34adf carb at a good price?

Thanks.

[Daniel]

I wouldn't trouble yourself trying to get a 1800 mainfold your not going to notice a differnce it's a waste of time and
money how do i know this you might ask ? well i tried upgrading my 1979 spider with just the ADF felt the same as
other Fiats i ran in the past with the 1800 manifold . If your going to run a bigger carb then the ADF Cams to
match high CR Pistons etc etc you'll want to go Single plane Manifold for sure .


Daniel

[narfire]

Is the most common place to find a single plane manifold off a 1800? Does anyone have one for sale? What is the best place to find a 34adf carb at a good price?

Yes,the 1800 had the single plane manifolds.
Try Craigslist in the cities near you for one. They show up on evil-bay as well.
The 34 ADF carb is great,but also expensive...around $500.00 new. I just finished helping a fellow install a 34 dmsa with a single plane intake on his 79. Hav'nt had it on the road yet,but does sound great. The dmsa is a mechanical choke so the water lines that went to the original carb just looped from the heater pipe to the water fitting on the intake manifold. Many have also installed the 32/36 carb as well.
Chris