Weber 34 ADF vs 32/36 DFEV

[volzke]

Hello. The time has come for the wife and I to dig into a carb. upgrade for our '79 Spider. I've found a variety of posts troubleshooting both the 34 and the 32/36; but does anyone have a preference for one over the other? Either one will be an upgrade over the stock, but I'd appreciate any feedback over why you chose the upgrade that you did. We also have the elusive auto. trans in our '79, so not sure if that makes a difference one way or the other. Many Thanks!

[geospider]

I have the 32/36 on my '79. great change; gotta get the single plane manifold (big difference)
it is a progressive carb: so, second barrel comes into play when you step on it.
I believe the 34 is Synchronous: both barrels all the time, and both biggger than the primary on the 32/36.

I think it depends on the performance you are looking for. The 34 should give a bunch more right away; and would prob get more out of it with an upgraded cam, etc.

it was easy for me: i had a single plane manifold and 32/26 from PO.

cost would also swing me to the 32/36.

can't go wrong with either. IMHO

Geo

[geospider]

...and I don;t think the vacuum for auto trans is an issue. Use a T vacuum port on the intake: one for the brake booster and one for the trans.
but then" i don't have auto, so i would double check

Wetminkey is planning the 32/36 swap with his '79 and I believe he has an auto trans. He does a ton of research prior, so I would def check with him.,

[samakijoe]

I installed a 32/36 DFEV a while ago. Very happy with it.
Got mine from Redline, they have a package/kit designed for the 124.
They indicted that it was "jetted" for the 124.

A couple of changes I made was a 1" spacer below the carb to allow better clearance for the throttle cable. After the install was completed I felt that the gas peddle was too sensitive. That is, only a short movement of the peddle would move the butterflies quite a bit. So I fabricated a longer arm where the throttle cable attaches to the carb. I used a piece of stainless.

If anyone would like pictures I will Email.

[wetminkey]

Goodness, sound like the difference between the major four-barrel carburetors,...equal sized primaries and secondaries, or smaller primaries and big secondaries,...'squarebore', or 'spreadbore'?
Depends on what you want for throttle response and gas mileage,...
Smaller primary venturis provide better overall fuel economy,...larger primary venturis give a faster throttle response.
Secondaries are usually vacuum activated, so they'll come into play per demand.
I usually manually shift my auto tranny in my Fiat, and I'll be sure to renew it's vacuum modulator (and adjust it, if possible). The other Turbohydromatics had adjustable modulators (to kinda determine shift rpm), why should the TH180 not?
I'd like to hear other opinions about this: 34 ADF vs 32/36 DFEV,...anyone with experience enough to have an opinion? I believe that at full throttle they are equivalent.
Best of luck with your car!
Todd.

[volzke]

Thanks for the feedback everyone. Sound like either unit is a solid upgrade, with some minor preferences on synchronous vs progressive operation. I noticed that Vick Auto only is stocking the 32/36 and not the 34, so I sent them a message to see if they had a preference. This was the reply I got: "The 32/36 are produced new from Weber Spain (their main plant). The 34ADF are not new except some Chinese ones that pop up ever now and again." I'll hedge my money on a new unit from Spain, so we are going to pick the 32/36 setup. Hopefully April or May, I'll have the time to start digging into the project. Take Care.

[Nanonevol]

I was lucky enough to find a good used 34 ADF. They are somewhat rare. I agree with going with the one made in Spain over a Chinese copy.

[manoa matt]

Both 32/36DFEV and 34ADF are progressive carbs.

The 34ADF has throttle plates in a separate casting which provides a better transition to the manifold and no additional spacers are needed. With the 34ADF you can re-use your existing air cleaner, and there are more direct/equivalent hookups to your existing hoses from your old carb. You have a choice of water or electric chokes with the 34ADF, although if you want to go the electric route, it would be an added purchase. The idle shutoff solenoid on the 34ADf also prevents dieseling at shutoff.

There is a lot of information on the 32ADFA and 34ADf carbs. Exploded diagrams, Fiat factory workshop manuals that list setup and tolerance specifications, rebuilding, etc.

With either the 32/36DFEV or the 34ADF you will need a single plane intake manifold from a 74-78. Another route that has not been mentioned is getting a used 32ADFA from a 76-78. This would probably be cheaper than a new 32/36DFEV, and better than a Chinese 34ADF.

[wetminkey]

I bought a brand new Weber 32/36 DFEV, made in Spain, from Redline, on eBay. Also found a used single plane intake manifold that is proper for my '79 on eBay. Good prices. Free shipping!
I began marking hoses, and removing the emissions equipment and intake manifold, from my '79 today.
The arrangement of plastic vacuum hoses is beautifully colored coded (original stuff), to match the color-marked connections on the carb and emissions modules! Red, yellow, gray, black, green,...it's pretty!
I just cleaned and rebuilt the 28/32 ADHA, and it's still wrapped in a cloth, so I'll just find a box for it. It has tiny, matching, color-coded 'rings' on the emissions connections to make hook-up easy! How cute! Those Fiat folks,...
Maybe someone will want my pretty, factory stuff, someday,...if it's cheap enough!
Swap underway!

[geospider]

you are on your way

[volzke]

Wetminkey. Well done. Sounds super organized. Hopefully, I'll be right behind you. Going to order my 32/36 through Vick Auto. A little higher pricing than on ebay, but I appreciate then supporting the forum, and they are more than happy to help if you send them an email; so I'll throw my money their way. Looking forward to seeing how the progress goes. Are you going to set up a specific thread?

[PaulC]

My approach is the one manoamatt previously mentioned -a 32ADFA in rough shape picked up for a.song ($50) but very rebuildable and the ever popular single plane from a 78 that's just been stripped of all the emission crap.

[wetminkey]

I've done so many performance upgrades on American engineering, that I'm really looking forward to letting this 2 liter breathe with the 32/36.
The car has a new cat and larger exhaust (w/o resonator), and it came with the 4-2-1 header, so this car just needs improved intake.
The turbo180 is strong, so it should be OK with the improvement,...I've not been into the rear axle. I'll have to see what it thinks of the big changes,...
Most everything else has been gone through, so brakes/suspension, fuel pump, etc,...will be not be a concern.
Reattaching my vapor canister might take some plumbing-engineering. As will crankcase ventilation, but I haven't bought an air cleaner yet,...I'll engineer it into that.
I'll start a new thread, probably in the Performance section, to cover my swap.
BTW,...Howdy from inside the Bomb Cyclone!

[PaulC]

We got the tail of the bomb.
More snow than in the last 10 years