Ferrari 308 GTS weber carburetor | FerrariChat

Ferrari 308 GTS weber carburetor

Discussion in '308/328' started by leslie_choo, Dec 20, 2014.

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  1. leslie_choo

    leslie_choo Formula Junior

    Aug 5, 2012
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    BCChoo
    Hi may I know where can I get a set of new weber carburetor for Ferrari 308 GTS ? If new set are no longer available , where can I find a fully restored / rebuild set ? Thanks


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  2. TonyL

    TonyL F1 Rookie

    Sep 27, 2007
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  3. leslie_choo

    leslie_choo Formula Junior

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  4. Kidasters

    Kidasters Formula Junior

    Oct 4, 2013
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    Jim Inglese is the best weber guy I've ever met. He rebuilt two DCOE carbs for me, and they look like they just came from the factory.

    You might give Jim a shout and see if he knows. Or, if you have something that needs rebuilding, I bet Jim can get them sorted.

    Home
     
  5. guygowrie

    guygowrie Formula 3

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    #5 guygowrie, Dec 20, 2014
    Last edited by a moderator: Sep 7, 2017
    leslie,

    Rebuild kits are cheap and stripping, cleaning, reassembly isn't too difficult but time and care is needed. I'm doing a spare set now. finding a good plater is not so easy.

    Pierce manifolds in California I think can rebuild them for you and are very well known.
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  6. Kidasters

    Kidasters Formula Junior

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    Ken
    Or you could just buy the rebuild kit from Pierce:

    40 DCN

    super helpful people too.
     
  7. Fairview

    Fairview Formula 3

    Mar 16, 2009
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    #7 Fairview, Dec 21, 2014
    Last edited by a moderator: Sep 7, 2017
    If you rebuild them yourself, or through somebody local to you, don't forget to deal with the throttle shaft bearings. These can/will leak air and upset the tuning and running of otherwise good carbs. There are other threads here on the topic.

    I opted to install the sealed bearings from Pierce Manifolds and the improvement has been quite noticeable. My guess is the throttle shaft bearings are often overlooked in a non-specialist rebuild. Even the Weber manual glosses over the importance of sealing the throttle shaft bearings. The old fashioned way was to pack them with grease, effective but not a long lasting solution.

    If you are experiencing a lot of popping and have carbs that are difficult to tune, you might focus in on a rebuild by a knowledgeable rebuilder such as Pierce, and installation of sealed bearings..

    Check out this photo of one of my original bearings as pulled from my carbs, and the sealed on on the right.

    Good luck! Jeff
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  8. TonyL

    TonyL F1 Rookie

    Sep 27, 2007
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    Excellent advice, I found the bearings a problem on mine, yet to fix them but they do cause lots of problems with tuning.
     
  9. guygowrie

    guygowrie Formula 3

    Sep 19, 2011
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    I think you are very right, but i am terrified of removing that shaft! Have to read some more threads!
     
  10. leslie_choo

    leslie_choo Formula Junior

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    This is very useful info thank u !
     
  11. leslie_choo

    leslie_choo Formula Junior

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    Btw I have another question, I am not too sure where and how to read my weber version , I guess based on the F36, 130 main jet , 200 air correction jet, 55 ideal jet seems to me it's a 57 58 59 60 version , I don't know what these number means , can anyone explain to me pls ? If I find a set of 64 65 66 67 version can they fit directly on my existing manifold ? Anyone can advice ? Thanks
     
  12. miketuason

    miketuason F1 World Champ
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    I bought brand new DCNF carbs from Pierce Manifold before.
     
  13. Rich S

    Rich S Formula Junior

    Nov 30, 2013
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    #13 Rich S, Dec 21, 2014
    Last edited: Dec 21, 2014
    You might want to read up on how Webers work. Other than setting float levels, all parts are fixed; the various numbers refer to drill hole diameters in the various jets; once correctly jetted for a standard, unmodified engine, no changes ought to be made. The emulsion tube is as close to voodoo magic as such things come; there is no correlation between emulsion tube numbers are there are in drill diameters on air & fuel jets. The emulsion tube in a Weber is similar in function, if not appearance. to the needle on an SU piston. It is a bit of an art to set up all carburetors correctly; including adjusting linkages, setting float levels, adjusting butterfly valves and so on. The good thing about Webers is that they don't require tuning or adjustment, other than making sure they're correctly set up with the right bits, and the float levels are correct. Changing the throttle shafts generally requires a special tool. My advice would be to have them gone thru by an expert as previously mentioned. Try "piercemanifolds.com" for more on this. Lots of info on his website... I've used Mike's shop a number of times; he does good work. (His shop is about 45 minutes away from me in Gilroy, California).

    Cheers,
    Rich
     
  14. bill308

    bill308 Formula 3
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    Carb families 35,36,37,38, or 57,58,59,60, or 72,73,74,75 or similar, differ by linkage within a family. Each position on a 4-carb installation has different linkage arms based upon their placement.
    Families differ by jetting, numbers of progression holes, their diameters and placement, float height setting and whether a 4 (40DCNF18) or 5-bolt (OEM) float bowl cover.

    All carbs within a family should have the same jetting and float level. Carbs of different families on a given car, should be avoided.

    I hope this helps.

    Bill
     
  15. leslie_choo

    leslie_choo Formula Junior

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    Thanks Bill, I just found this chart. Image Unavailable, Please Login . And I also found a new set of 64 65 66 67 weber and hope they could fit well in my GTS 308.
     
  16. Ricambio

    Ricambio Karting

    Dec 30, 2016
    76
    Hello,

    old thread bump, but I was wondering if can be sourced brand new carbs rather than dissamblke them for deep cleaning and do the service rebuild kit and tune up them? If they are NLA at all, I'm guessing the only option would be the mentioned :/

    Thanks
     
  17. sltillim

    sltillim Formula 3
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    Nov 22, 2009
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    as above, you will have a hard time finding the right set. You can buy a kit. If you don't want to do the work, send it to a professional. Like above, I would recommend Peirce Manifolds in Gilroy, California. I have been in their building and they bought many of the calibration equipment from weber when they went out of business. The owner used to own a 308.
     
  18. Kidasters

    Kidasters Formula Junior

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  19. BigTex

    BigTex Seven Time F1 World Champ
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    Also be advised that Leslie's posted Factory jetting chart was not for modern fuel.

    There's re-jetting to do, for ethanol fuels.
     
  20. Ricambio

    Ricambio Karting

    Dec 30, 2016
    76
    Thanks for the reply and recomendation. I would prefer to send the carbs to Peirce Manifolds to get them rebuilded and not sure if they set the carb, so when I recieve them I just bolt them up in the engine and run or it will need carburation adjustment as well?

    I already set the butterflies to get them open equal, but adjusting the carbs witht he vaccum tool is getting very difficult and still getting the "pop pop" noise in the exhaust.
     
  21. Kidasters

    Kidasters Formula Junior

    Oct 4, 2013
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    Hey Ricambio -

    If the carbs have never been rebuilt, and you are still getting popping, it's probably a sign that one barrel is running lean and you have an air leak. As has been posted, this could be because of a bearing on the throttle shafts leaking, since it may not have been repacked with grease since the 70's. That was the whole problem with my carbs, and when I sent them to Pierce, I told them I wanted sealed bearings installed.

    Once the sealed bearings were installed, and the carbs back on the car, you still have some work to do to ensure everything is tuned correctly. This site has an excellent "go by" for tuning carbs:

    Carb synch tutorial: 308 Series

    It is not just "bolt and go". It took me a few days of monkeying to get mine sort of set, and I'm still running pretty rich.

    Finally - if you haven't made a "reservation" with pierce, expect to wait a bit. They usually have a 1 year backlog of carbs they are re-building. I did not have a reservation, and they worked me into the que. Sent them my carbs at the beginning of Feb, and got them back in mid-April. I thought that was pretty good turn around too.

    Good Luck.

    Ken
     
  22. johnhold

    johnhold Rookie

    Jul 5, 2016
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    Hi all how do you get the number 1 carburetor off stuck with one nut at the back car not starting now and popping bk through the carb
     
  23. absostone

    absostone F1 Veteran
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    Jul 28, 2008
    9,178
    Disconnect side to side linkage and front to back linkage. But sure what you mean about the nut is stuck. Stripped?
     
  24. leslie_choo

    leslie_choo Formula Junior

    Aug 5, 2012
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    I am confused with the air fuel mixture screws . Mine seems to work the opposite direction even after reading Birdman tutorial it says turning clock wise ( tightening the screw ) to lean the carb , anti clock wise (loosen the screw ) is richer the carb .

    But my air fuel mixture screw works opposite way . When I tightened the screw , turn clock wise it gets richer ( colortune show bright orange) . When I loosen the screw it gets leaner . Is this the correct way ? Or I miss understood the tutorial ?
     
  25. absostone

    absostone F1 Veteran
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    Jul 28, 2008
    9,178
    Mixture screws are the lowest flat head screws. The one with a but higher up are air bypass
     

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