Weber DCOE idle jets | FerrariChat

Weber DCOE idle jets

Discussion in '365 GT4 2+2/400/412' started by Joe Bergmann, Jun 30, 2006.

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  1. Joe Bergmann

    Joe Bergmann Karting

    Oct 24, 2005
    50
    Shoreview, Minnesota
    Full Name:
    Joe Bergmann
    #1 Joe Bergmann, Jun 30, 2006
    Does anyone know what the stock idle jet size is for a 1978 400 GT? I have records on my car that say "carb jets changed for performance". I was wondering what the stock jet size is supposed to be.

    Joe
     
  2. dkbluec4

    dkbluec4 Rookie

    May 29, 2006
    47
    Northampton UK
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    Neil Lefley
    #2 dkbluec4, Jul 14, 2006
    Hello Joe,
    Just noticed your question - my Weber catalogue lists 400 GT-CA 4823 Mod. 1976 as having F23/45 Getto Minimo.
    Regards,
    Neil.
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    25,145
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    #3 Steve Magnusson, Jul 14, 2006
    Last edited by a moderator: Sep 7, 2017
  4. brettski

    brettski Formula 3

    Feb 29, 2004
    1,754
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    brett swaykoski
    #4 brettski, Jul 15, 2006
    very cool post.

    brett
     
  5. Joe Bergmann

    Joe Bergmann Karting

    Oct 24, 2005
    50
    Shoreview, Minnesota
    Full Name:
    Joe Bergmann
    #5 Joe Bergmann, Jul 19, 2006
    Thanks to Neil and 91tr!!!
     
  6. Randy Forbes

    Randy Forbes Formula Junior

    Jul 14, 2006
    741
    Sarasota, FL
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    Sports Cars Plus,LLC
    #6 Randy Forbes, Jul 19, 2006
    Last edited by a moderator: Sep 7, 2017
    I'm a little late to the party, but this is the best method I've yet found for balancing the airflow through the 45 DCOEs on my Healey. Also attached are some additional pictures for some Weber insight. Hope you find it useful...
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  7. dkbluec4

    dkbluec4 Rookie

    May 29, 2006
    47
    Northampton UK
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    Neil Lefley
    #7 dkbluec4, Jul 20, 2006
    Hello,
    Simplest method of checking the airflow through each choke is to buy a "Synchrometer" from a Weber stockist (or look on eBay ). Using it is easy compared to taking off the air cleaners on a 400 GT ! It gives you a straightforward reading for each cylinder, and you can buy rubber adapters that allow you to use it in awkward spaces.
    Regards,
    Neil.
     
  8. Joe Bergmann

    Joe Bergmann Karting

    Oct 24, 2005
    50
    Shoreview, Minnesota
    Full Name:
    Joe Bergmann
    #8 Joe Bergmann, Jul 24, 2006
    Thanks to all who have contributed to this post! I am learning that having the throttle linkages all identical is absolutely critical to proper operation on these things. All my other cars are injected so I'm new to carbs. I intend on getting a synchrometer asap so I can finally fine tune without resorting to 'playing it by ear'. All in all I'm having a blast! The worst drive in a Ferrari is better than the best drive in my BMW!
     
  9. dkbluec4

    dkbluec4 Rookie

    May 29, 2006
    47
    Northampton UK
    Full Name:
    Neil Lefley
    #9 dkbluec4, Jul 25, 2006
    Hello Joe,
    One last thing.
    On my GTC/4, the rods connecting the operating levers to the carb levers, had a RH thread on both ends, which means you can't change the length to adjust the position of the butterflies, without rotating the lever on the shaft, and re-clamping it. Pierce manifolds will sell you a set of 6 replacements with RH and LH threads, for around $120.
    Regards,
    Neil.
     

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