Best Carbs for 1608 Engine

[SeldomSeen]

Please forgive me if this topic has been discussed but at this time I just don't have time to research the archives. The 34/34 Weber I have is not compatible with my newly rebuilt engine. I can't go into it because I lack the ability to explain the problems (something about the secondary coming on at low RPMs and overloading the engine and other syptoms plus there is an intermitant idle problem). What are the best brand new, readily available alternatives to this carb?

[So Cal Mark]

there aren't too many alternatives for brand new, readily available carbs

[narfire]

I have a 72 that is taking way to long to finish, but the carb that was on it was a 34 DMSA and am putting it back on now it has been rebuilt.
Hope it works ok.

[Dougieb]

+1 on the 34 DMSA carb.

I have a '72 also and got tired of messing with the DHSA.
Soooooo, I am bolting on a single plane intake manifold and 34 DMSA carb.
Looking forward to see the difference.

[SeldomSeen]

Thanks all. I'll pass this along to my mechanic.

[124JOE]

i bought a 1980 parts car back in 2001 and it had a 1608 in it with FI setup
whitch i still have"stored"

[SeldomSeen]

To all of you who are considering the 34/34 Weber. My engine was suffering from two problems at once. First I had replaced the fuel pump with a new one that was not up to snuff. It had insuffecient pressure. There is a new electric fuel pump in the trunk now. Second, the carb needed a new needle and seat. Now all is well and the car runs as well as any 1608 ever did.

[WYSpider]

Glad you are squared away in time for spring driving

[georgeramos]

Is the DMSA available new?

[SeldomSeen]

I don't know if the 34/34 is available new. I do know that the original carb for the 1608 is no longer available. My 34 came with the car. It was about the only part from the old engine that could be saved. My mechanic said that the PPOs attempt to get the engine rebuilt was the worst butchering job that he has seen in forty years of wrench spinning on Fiats.

For the first time in about fifteen years this car is in wonderful running condition. It was very expensive - far more than I ever expected. Of the four 124 spiders that I've owned over the years this engine is by far the smoothest and most powerful thanks to Tom Dotter at Aspen Import Auto in Denver. With a .30 overbore, balancing, refreshed head and big carb etc. it's almost as fast as my Alfa!

[WYSpider]

Of the four 124 spiders that I've owned over the years this engine is by far the smoothest and most powerful thanks to Tom Dotter at Aspen Import Auto in Denver. With a .30 overbore, balancing, refreshed head and big carb etc. it's almost as fast as my Alfa!

Sweet. Share a video if you get a chance.

[bradartigue]

Please forgive me if this topic has been discussed but at this time I just don't have time to research the archives.

Bummer, because research would have told you well in advance that there is no 34/34 ever made that is compatible with any of the stock FIAT twin cam engines. What carb are you trying to use, because the only 34/34 I know of has the ports reversed from what a FIAT needs and the emulsion tubes are set for a VW dune buggy. Irrelevant though, because you don't have a lot of choices:

If you want a new carburetor then get a 32/36 DFEV from any FIAT Vendor. It is directly compatible with every Dxxx Weber FIAT ever used on these motors, is a nice upgrade, and lacks any form of emissions provisions. It will drive everything from the stock 1438 to the 2000 with only minor jetting changes to accommodate the differences in displacement.

If you want a used carburetor then get a 34DMS or 34DMSA, the "A" having the high idle capsule, if you can find one rebuilt. The only place I know of that occasionally has them is Chris Obert, and that would also be the only vendor I think still deals with used carburetors.

You could also use the stock setup with a DHSA2 and live with the latency and bucking of vacuum-operating carburetors. I wouldn't recommend this to anyone, ever.

You could use twin Weber 40IDFs, but if you're relying on a mechanic to do your work then don't go down this road. He won't know how to do it and you won't know how to tell him.

[SeldomSeen]

bradartigue:

Okay I finally got out the flashlight and small dental inspection mirror. The engine side of the carb at the base said 34DMS2. The four was badly scratched but it seems to be a four. Sorry about the confusion.

[bradartigue]

bradartigue:

Okay I finally got out the flashlight and small dental inspection mirror. The engine side of the carb at the base said 34DMS2. The four was badly scratched but it seems to be a four. Sorry about the confusion.

That carb is the best type for your TC. If your mechanic can't get it to work on a 1608 then you may want to consider another mechanic; he either can't diagnose problems or can't work on Webers. Best bet is to set it to the same jetting as a 1974 1800cc Spider. When you take the jets out to replace or check them then spray carb cleaner all through it and clean it up.

Unless the carb is filthy, cracked, or otherwise mechanically broken it will work on ANY FIAT Spider twin cam, and work wonderfully.

I have the carb diagrams for the DMS online: http://www.artigue.com/fiat/carburetors

[bradartigue]

Apologies in that I thought you were still having issues, glad it works.