Reply To: Spark Plug

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January 19, 2019 at 6:27 pm #163989
Buccaneer
Participant

    US Member

    18mm spark plug heat range chart … Hottest on top, Coldest on bottom

    Champion – – – AC – – – Autolite – Bosh – Motorcraft Prestolite
    C7 (D23) – – – – – –
    C15(D21) – – – C88 – – – – – – – – – – BT9
    7 (D16) – – – C87 – – – – – – – – – – B8X
    6M (D14) – – – C85 – – – 386
    5M (D9) – – – C82 – – – 373 – – M8A – — – BT4 – – – 18-3
    R7 (D6) – – – – – – 372 – – M7A
    R1
    R11
    R11S Old racers using Alcohol
    R2
    R2S Using Nitromethane.

    Prepare to be boarded!