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Thread: carb adjustment

  1. #1
    Speedster Member
    Join Date
    May 2013
    pawling ny

    carb adjustment

    what is the best RPM to set the idle at on a 259 V8 with a 2b Stromberg carb. The manual says 550 - 600 rpm and I was just wondering if setting at 650 or 700 rpm would be better or worse. thanks

  2. #2
    President Member thunderations's Avatar
    Join Date
    Nov 2012
    Phoenix, AZ
    If the car is an automatic, a high idle will cause more creep when in gear.
    Try increasing the idle speed and see if you like it. If not, adjust it back.
    1966 Daytona (The First One)
    1950 Champion Convertible
    1950 Champion 4Dr
    1955 President 2 Dr Hardtop
    1957 Thunderbird

  3. #3
    President Member
    Join Date
    Apr 2016
    Westbrook, MN
    Chock the wheels and set e brake. Adjust with car in drive. Otherwise its just like thunderations said: if you don't like all you gotta do is turn the screwdriver just a little.

  4. #4
    Golden Hawk Member StudeRich's Avatar
    Join Date
    Dec 2005
    Ferndale, WA, USA.
    If you get too crazy with the Higher than normal Idle, it will cause a late downshift to 2nd. Gear, and depending on the Ignition Timing setting and Temp., it could Diesel (run on) at shutdown.
    Second Generation Stude Driver,
    Proud '54 Starliner Owner

  5. #5
    President Member
    Join Date
    Apr 2006
    Union Gap, Washington, USA.
    You have to remember that the idle screw is subject to wear so you can take off for a drive and have to adjust it mid trip.
    If you car is ugly then it better be fast.....

    65 2dr sedan
    64 2dr sedan (Pinkie)
    61 V8 Tcab
    63 Tcab 20R powered
    55 Commander Wagon
    54 Champion Wagon
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    45 Agricat
    67 Triumph T100
    66 Bultaco Matadore

  6. #6
    President Member
    Join Date
    Apr 2009
    Hawthorne, California, USA.
    If the engine is in good condition, 550 RPM in neutral with a standard transmission or an automatic transmission in drive should give a smooth idle with little creep and no stalling with auto transmissions. If the engine stalls or runs rough at 5 to 600 RPM, start looking for mechanical issues such as out of adjustment valves, low compression, ignition problems etc. Bud

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