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motorhead question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by k5_beater, Oct 11, 2002.

  1. k5_beater

    k5_beater Registered Member

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    i just recently dropped a rebuilt 350 in my k5 and i am having some trouble with the timing. it has a mild cam and some other mods for some hp bump up. my timing is some where in the 20 to 23 degrees range with the advance hooked up . i feel like i have no power and when i shut it off it runs on. just some input would be appreciated. /forums/images/graemlins/1zhelp.gif
     
  2. POWERMAD

    POWERMAD 1/2 ton status

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    Run on could be either the timing set to high or the idle to high.
    20-23 is about right.
    That would be about 10-13 deg. intitial.
    with the vacumme another 10 degrees.
    I would start with the initial about 8* and go from there.
    how is the condition of the mechanical advance?
     
  3. k5_beater

    k5_beater Registered Member

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    yeah we stared with 8 and just going up and up.
     
  4. captain chaos

    captain chaos 1/2 ton status

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    are you checking you're total timing at about 3,000rpm?
    3,000 rpm you should have total timing of about 34 to 36.
    you may need a adjustable vacum advance to get this.
    think you will find you're power then.

    dave
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    How do you have the vac advance hooked up? Sounds like you have it hooked up to manifold vacuum, if you do, try it with ported vac, which will bring the idle advance down quite a bit.
     
  6. k5_beater

    k5_beater Registered Member

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    yeah i have it hooked up to the primary vaccum off the carb. i will try the totoal timing /forums/images/graemlins/thumb.gif
     
  7. bablazer73

    bablazer73 1/2 ton status

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    this sounds like a timing problem. I would make sure you are set at 8-10 degrees initial and no more than 36 total at 3,000 rpm. By chance do you have a digital timing light so you can see the ignition curve? also, did you use a "performance distributer curve kit" in your do dads? I have seen many people put these in with the lightest springs in kit and they are to light and will hold the mechanical advance out causing similar problems. If you have a vacuum tester, check to make sure the vacuum advance is working fully and also retracting. You might have to get an adjustable vacuum advance to fine tune the ignition to work with all your performance mods. A stock ignition is not curved for performance situations. /forums/images/graemlins/usaflag.gif
     

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