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  1. #1

    Default Timing - Advance or Retard to stop knock?

    I've noticed it as the temps heating up here in Tx. Don't know if it has anything to do with it, but I was wondering if I should mess with the timing to keep it from knocking when I accelerate? When I'm on the the hwy, if I accelerate, it'll knock. I can press the pedal more or back off of it and it quits. Usually around 60 - 65. No vacuum leaks, plugs are good, wires good...all that good stuff. It is carborated so maybe I should lean it up a little? Too many options and no clue where to start. Don't want to do anything if it's not going to make a difference.

    Chevy 350, stock, Holley 600...

    Thanks for the inputs!!!
    TNT - Texas

    First - '68 longbed (lady runs stop sign, insurance gives me a check)
    Then - '81 SWB (stupid stupid stupid...sold it thinking I was going to get something else)
    Now - Finally got my '86 (350, Holley 600, 700r4)

  2. #2
    Legend

    Join Date
    Jun 2006
    Location
    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.
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    1,613

    Default

    In general you would want to richen it up, and or retard the timing.

    Real life I would use 93 octane, if you don't already.

    1)Use 93 octane-this should do it, if it hasn't already.
    2)Retard the timing a few degrees-3 or so- so it has less advance-for example firing at 15 degrees before instead of 18 degrees before TDC
    3)Go up one on the pilot jet-Holley's have pilot jets and main jets right?

    4)Don't lug the motor-keep it in a lower gear than you really need-stay in 1st longer, 2nd longer etc.

    Do you have a higher than stock compression motor?

    Charlie
    1998 suburban-
    1/2 ton

    199500 miles
    River
    Ridge,LA

  3. #3
    Master Mechanic Silverado Junkie's Avatar
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    Feb 2010
    Location
    Lead Hill, Arkansas
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    541

    Default

    Hes right, reduce timing to reduce knocking. Thats what knock sensors in newer vehicles do, when knocking is detected they reduce timing.
    1995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short ram-air intake, throttle body spacer, MSD ignition coil, straight pipes

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