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  • Spark plug question

    I have a stock 2.5 Duratec and I was wondering if there would be any problems if I were to use a set of Motorcraft plugs that are one step hotter. I don't have the part number with me at the moment, but I got a set a few years ago due to an ordering mixup by the supplier, who didn't charge me for them. I would hate to waste them, so what are the pros and cons? My engine runs fine with the stock heat range.
    '99 CSVT # 2507
    SF/MNB
    BAT suspension, Nautilus brake conv.
    '65 Mustang coupe
    '74 260 Z

  • #2
    They will work fine, one step won't bother anything. Gap them at no more than .045.
    Don Higgins
    Crew Chief Pro Drag Racing Software
    http://www.crewchiefpro.com
    1999 3.0 Turbo CSVT ** 2013 American Dragster with 1100 Horsepower 7.28 @ 185 mph

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    • #3
      Wouldn't a hotter plug with the already aggressive timing for the SVT increase the potential for pre-detonation?
      - 12 Focus SE
      - 99 Contour SeVT <- 3L/NPG Turbo
      - 2k Contour SVT - #2137

      Comment


      • #4
        No, with proper fuel it won't notice or care.
        Don Higgins
        Crew Chief Pro Drag Racing Software
        http://www.crewchiefpro.com
        1999 3.0 Turbo CSVT ** 2013 American Dragster with 1100 Horsepower 7.28 @ 185 mph

        Comment


        • #5
          Ok. So the correct fuel in this case for a stock SVT is still 91 or 93? Or would one need to step up to a higher octane?

          Just making sure I understand.
          - 12 Focus SE
          - 99 Contour SeVT <- 3L/NPG Turbo
          - 2k Contour SVT - #2137

          Comment


          • #6
            Originally posted by BrApple View Post
            Ok. So the correct fuel in this case for a stock SVT is still 91 or 93? Or would one need to step up to a higher octane?

            Just making sure I understand.
            Yup. Still 91 or 93. I see where u're coming from tho brian. I thought ppl generally went colder on plugs...
            Julian
            98.5 csvt #6226 of 6535
            Rally Inspired 3L turbo'd monsTOUR
            Modifications??? well...lets just say this ain'tcha grandma's contour :D

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            • #7
              Thanks for everyone's input. Now I can change them without worrying.
              '99 CSVT # 2507
              SF/MNB
              BAT suspension, Nautilus brake conv.
              '65 Mustang coupe
              '74 260 Z

              Comment

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