Jump to content

Weber 32/34 DFT Carb on 1981 Datsun 720 with a Z24

Recommended Posts

I recently acquired an '81 Datsun 720 4WD that the previous owner had modified over the years.  The original truck had a Z22 engine and the owner put a California CARB approved Weber 32/34 DFT 9 carburetor to replace an aging Hitachi carb.  Then, a few years later, he swapped in a Z24 engine and moved the Weber over without modification.  Now I own the truck and I want it to all work well.  Does anyone know the jetting setup for the Weber 32/34 DFT when on the Z24?  I have removed and serviced the Weber, but the engine sometimes still hesitates at lower engine speeds when throttle is applied and I'd like to correct that.  The engine idles well and also runs well under throttle.





  • Like 1
Link to comment
  • Replies 10
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

A 32/34 DFT is a little small for a Z24.  It'll work, but you won't be racing it.


A 32/36 would be better, BUT it's not CARB approved and since you're in San Diego your only choices are the DFT or a stock Hitachi.


The hesitation is more likely the Weber's accelerator pump is either wearing out or undersized, but parts for a 32/34 aren't particularly easy to find.  You only need to change the main jets if it's running the wrong mixture, which really needs to be run on an analyzer to find out (or run a sensor to determine the mix). 

  • Like 2
Link to comment

Thank you all very much for your comments. I've known the previous owner of this '81 720 4WD for many years and the Z24 and the short-tail 5-speed came out of a low-mileage 1985 720 4WD vehicle I used to own.  The current performance of the Z24 in the 1981 with the Weber 32/34 DFT is about the same as the previous 1985 with the stock Hitachi.  What I'm trying to solve is the hesitation at low RPM with throttle change.  The Weber kit (K8649) was made for the Z22 and worked great on that engine.  I tried contacting Redline Weber directly and also through an authorized dealer, but they will only say that the DFT series is obsolete and they don't support it.  An Internet search found the California State CARB Executive Order approving the K8649 Weber DFT for use on the Z-series, and it includes a detailed summary of how to do the conversion and what emission equipment should be removed.  I've taken all of the vacuum hoses off of the Z24 and replaced them with new hoses that are grouped and connected as shown on Weber's instructions.  Now the truck runs 95% better and almost never hesitates.  I didn't find any leaking vacuum hoses, but there are fewer hoses now and I can comprehend the groupings.  Weber still makes the jets for the DFT, but you can't obtain any information about the part numbers by referring to the DFT.  I've ordered Braden's book on Weber Carburetors and it should arrive today in the mail.  The book was published in 1988, is rated 4.7 out of five stars, and it has an entire section on DFT applications.  Hopefully, I'll get some good information from the book.



Link to comment



It is often the little details, like cracked vacuum hoses.

Now the truck runs 95% better and almost never hesitates.

Too bad the carb books never explain about how to check old carbs. The 5% left might be a leaking idle pull off (common source of vacuum leak), a leaking air cleaner flap valve , a leaking distributor vacuum advance or one of the other vacuum devices .
  • Like 1
Link to comment
  • 5 years later...

I am curious, is the Weber 32/34 DFT 9A/11A nothing more than an emissions carb.

I ask because I have 2 of them and it appeared to me that they will bolt right onto a stock Datsun 320 E1 manifold, I thought they were really old Weber carbs from the 60s, but now I am wondering if they are just modern CA emissions carbs.

If they were old(60s carbs) then they would be period correct for the 320 although there is no way the stock air filter housing would fit on the carb adapter it has.







Edited by wayno
Link to comment
On 4/16/2014 at 7:54 AM, Charlie69 said:

On a Z 24 I would not run less than a 32/36.  The 38 runs real strong on a fresh Z24.  32 34 is to small in my opinion.


Are you possitive your 81 has the Z24?  The Z24 was not available in 1981.

Chevy sold millions of their V8s with single barrel carbs. I think this one will be fine.

  • Like 1
Link to comment

We've had this discussion before. The "smog legal" Weber was very similar to ones found on Pintos, Fiats and other makes/models. There was even a Ford Motorcraft part number for a near identical carb, and they called it a "Holley Weber 5200".


You have obviously found out the hard way that there is little to no support for these smog legal carbs, but reading what you posted made me wonder if by searching for parts from a Fiat or Pinto, you may find that a lot of the parts (like jets) interchange.


28/32 ADF


34 ADF

32/36 DFEV


These are just some of the names I found in a quick search for "Fiat Weber". Try one of these and see if any of the parts interchange. Maybe a call to Redline or Pierce would help clear this up.

  • Like 1
Link to comment

I should have mentioned this was an old thread revival.

I have found gasket kits(rebuild?) for these carbs at Pierce Manifolds.

I guess mostly I was asking if these were period correct for the 320 truck, I got these carbs with a 1964 Datsun NL320 and this is why I thought they might be period correct, but now I understand they are 1980s??? carbs and not made back in the 60s.

  • Like 1
Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.