Sparkplug heat. -9 to -10 Any real difference

Discussion in 'PSI Superchargers Tech Questions' started by Comax Racing, Aug 25, 2010.

  1. Comax Racing

    Comax Racing Member

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    I am going to order a bunch of spark plugs right away, but to get a good deal I have to order in bulk. This is a bb chevy 14-71 HHR will be running close to 40 PSI. Which heat range would be best -9 or -10 or will they both run ok? I don't want to order 100+ plugs only to find out I got the wrong ones.

    Thanks for any info

    Corey
     
    #1
    Last edited: Aug 25, 2010
    Comax Racing, Aug 25, 2010
  2. Mike Canter

    Mike Canter Top Dragster
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    In this case order the -10. If you already had the -9 then I would say use them. It makes no difference to reading the plug base ring but the -10 center electrode runs cooler so if you go way lean it will not act like a glo plug.
     
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    Mike Canter, Aug 25, 2010
  3. Comax Racing

    Comax Racing Member

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    Plug heat

    Thanks for the info Mike

    Corey
     
    #3
    Comax Racing, Aug 25, 2010

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