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float adjustment on 40DCNF13

Discussion in '206/246' started by elias amiouni, May 3, 2016.

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  1. elias amiouni

    elias amiouni Rookie

    Aug 22, 2012
    14
    BEIRUT,LEBANON
    Full Name:
    ELIAS AMIOUNI
    #1 elias amiouni, May 3, 2016
    Can anyone tell me what is the correct setting for the floats on the 40 DCNF13 Weber. I have seen different values, and right now I have them at 52 mm + 8.5mm travel, does that seem right? Also , the car seems to hesitate when I am negotiating left hand hairpins but runs perfectly smooth on right hand ones, could this be related to incorrect float level settings?
     
  2. dm_n_stuff

    dm_n_stuff Four Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2003
    43,750
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    Dave M.
    #2 dm_n_stuff, May 3, 2016
    Hard left turns starve, right turns can flood. Has to do with the transverse location of the carbs, vs north - south as Weber originally designed.

    D
     
  3. TonyL

    TonyL F1 Rookie

    Sep 27, 2007
    4,202
    Norfolk - UK
    Full Name:
    Tony
    #3 TonyL, May 3, 2016
    Yes, that's the correct float adjustment.

    Its a quirk of the 246 as dave quite rightly points out but they can be tuned much better by making some subtle changes to the air correction jets, go one or two sizes down to richen up the mixture above 3000rpm. With modern fuels my car has been proven to run lean above 3000rpm.

    see "dino on a rolling road"
     
  4. daviekj

    daviekj Formula Junior
    Silver Subscribed

    May 9, 2008
    486
    UK
    #4 daviekj, May 3, 2016
    Last edited by a moderator: Sep 7, 2017
    A couple of photos from when I set this up at least 10 years ago. Same float level dimension as those quoted above.

    I had trouble setting one of the carbs, and it took me a while to diagnose why.

    I had to repair a pin hole from an imperfection in one of the brass floats ( it is in the last photo somewhere). I removed the manufacture solder plug (the cleaned hole in the second photo), thorough de-gassed, repaired the tiny pin hole with solder, and then re-plugged the manufacture hole with soldered, and checked the weight. Been working fine since.

    While you have the floats out, have a shake and make sure they are dry. Plunge into fluid and make sure no air bubbles.

    Kevin
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  5. Stefan Elshout

    Stefan Elshout Karting

    Dec 1, 2011
    168
    Holland
    #5 Stefan Elshout, May 3, 2016
    Last edited by a moderator: Sep 7, 2017
    Been thru some trouble setting up mine a while ago, best way to get them spot on evenly was with the setup as shown in the picture. Took a bolt with a long nut and adjusted the nut until it was exactly 52mm. Put it on the cover and position the dial gauge above it and adjust the gauge until it reads zero. Than you have your setting on which, when the float touches the dial gauge and reads zero should be perfect and perfectly even compared to the other floats.
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