400 carburator needle valves wear | FerrariChat

400 carburator needle valves wear

Discussion in '365 GT4 2+2/400/412' started by Martin BB, May 3, 2021.

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  1. Martin BB

    Martin BB Rookie

    Nov 25, 2020
    34
    Full Name:
    Martin Houwing
    #1 Martin BB, May 3, 2021
    I noticed a little bid of black smoke coming from the exhaust when the engine is idling, engine warmed-up well. I replaced the little needle valves in each carburator which should keep the float at a constant level and the smoke is gone. Subject valves where replaced 12000 km ago. What is your experience with the wear of these valves?
    12000 km seems quite a short distance with regard to wear, when I took the old ones out they looked like new.
     
  2. SouthJersey400i

    SouthJersey400i Formula 3

    Mar 14, 2007
    1,603
    Romulus, NY (Finger Lakes)
    Full Name:
    Ken Battle
    #2 SouthJersey400i, May 4, 2021
    Wear usually shows up as a step in the normal V-shape needle. If no V-visible the wear must have been on the female side of the valve. Did you replace both pieces? They should come as a pair.
    Ken
     
  3. Martin BB

    Martin BB Rookie

    Nov 25, 2020
    34
    Full Name:
    Martin Houwing
    #3 Martin BB, May 4, 2021
    Yes, I replaced the complete set male and female and all 6.
     
  4. Ak Jim

    Ak Jim F1 Veteran
    Owner Rossa Subscribed

    Dec 23, 2007
    8,489
    North Pole AK
    #4 Ak Jim, May 6, 2021
    Did you check/adjust the float levels when you changed the parts? If not, in the future I’d check the float levels before changing the needle and seats. The rich situation could have been caused by float levels too high.
     

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