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amount of vacuum advance

Discussion in 'The Garage' started by Big GMC truck, Jan 18, 2006.

  1. Big GMC truck

    Big GMC truck Registered Member

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    Location:
    California
    1984 GMC K1500 305
    I'm getting about 16 pounds of vacuum (at idle) from the vacuum advance line. Is this the right amount of vacuum? Should vacuum increase as rpms increase?
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    You shouldn't have any advance at idle for a smog motor . Advance is for part throttle cruise . You may have it on the wrong port of the carb .
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    Location:
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    Under load vacuum will decrease as throttle opening increases.

    Doesn't really matter where it's hooked up as long as the engine likes the advance it's getting.
     

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