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Wide band reads 10 at idle- RICH

Discussion in 'General Carb Tech' started by jnhj, Sep 7, 2013.

  1. jnhj

    Joined:
    Jun 13, 2013
    Running a BG 650 blow thu..... It's running rich at idle, Question is should I change the Primary jets ony or down jet the primary as well as secondary. Burns my eyes at idle.

    Setup is a 71 Buick 350, twin t3/4 turbos runnning a conservative 8lbs of boost to start.
    Running 6lbs of fuel pressure at the regulator.

    What do you guys think??
     
    jnhj, Sep 7, 2013
    #1

  2. Mnlx

    Joined:
    Sep 20, 2009
    Do the idle mixture screws have any effect?
     
    Mnlx, Sep 7, 2013
    #2

  3. jnhj

    Joined:
    Jun 13, 2013
    Carb has idle-eze, so i have not messed with the idle mixture screws. I noticed under the secondary boosters there is carbon build up from running RICH.... I think I'll d-jet the secondaries and go from there
     
    jnhj, Sep 7, 2013
    #3

  4. Rickracer

    Joined:
    Nov 19, 2012
    Main jets have very little effect at idle, and are important enough that you don't want to change them unless you have fuel mixture problems with the main circuits. I would suggest opening up the Idle Air Bleeds a bit and see what you have from there. Do you know what size they are? The BG carb should have adjustable IABs and IFRs, running rich, IFRs may need to go down, or IABs go up.
     
    Rickracer, Sep 9, 2013
    #4

  5. rick4106

    Joined:
    Apr 25, 2012
    I had a problem with fuel pressure guage reading wrong. Couldn't get afr down at idle. Tried different gauge and lowered fuel pressure and was able to get afr correct. Something to check.
     
    rick4106, Jan 23, 2014
    #5

  6. 70 5.0Merc

    Joined:
    Aug 30, 2005
    Start at the beginning. Pull the carb and reset the throttle plates to show "square" transfer slots on the primary side. Here is the Demon instructions on setting the idle eze to double check. Lol, old thread...
     
    70 5.0Merc, Jan 24, 2014
    #6

  7. poboyracin

    Joined:
    Jan 30, 2007
    Power Valve leaking?
     
    poboyracin, Feb 14, 2014
    #7

  8. rdakota340

    Joined:
    Nov 13, 2006
    Primary jets do not have anything to do with idle circuit do as posted start from scratch then try and adjust your idle mixture screws about 1/8 of a turn at a time!
     
    rdakota340, Feb 14, 2014
    #8
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