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Spark plug heat number

Discussion in 'Newbie and Basic Turbo Tech Forum' started by melofton, Jul 31, 2022.

  1. melofton

    Joined:
    May 30, 2020
    Some advice to a nubee would be most helpful!
    My hot rod has a bbf 460 with dove C big valve heads , 9.5 to /1 , with a VSR 78/96 t6 turbo & a blow thru E85 carb .
    I’m running auto lite ap 45 plugs which run well but with boost should I run colder or hotter plugs?
    Thank you
     
    melofton, Jul 31, 2022
    #1

  2. 91turboterror

    Joined:
    Mar 17, 2013
    1 or 2 steps colder plug
     
    91turboterror, Jul 31, 2022
    #2

  3. melofton

    Joined:
    May 30, 2020
    Thank you
     
    melofton, Jul 31, 2022
    #3

  4. B E N

    Joined:
    Nov 22, 2016
    How much boost? I ran AR33's with a similar combo at 12-16 psi (6000ft elevation) and had good luck.
     
    B E N, Aug 1, 2022
    #4

  5. melofton

    Joined:
    May 30, 2020
    10 to 15 psi boost at 750’ elevation.
    Is the ar33 colder than my AP 45?
    I assume it is.
     
    melofton, Aug 1, 2022
    #5

  6. B E N

    Joined:
    Nov 22, 2016
    Yeah, 45 is right in the middle, 43 is 2 steps cooler (in autolite)
     
    B E N, Aug 1, 2022
    #6
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