Re: Speeditwin Spark Plug Choices

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August 30, 2015 at 7:05 pm #22925
RICHARD A. WHITE
Participant

    Lifetime Member

    Well, I agree, so here is some info to chew on.

    First chart shows Champion W10 as being on the cold side of the heat range:

    http://www.fordbarn.com/forum/showthread.php?t=6458

    And here is the heat range chart for the D9, it is on the second page: also on the cold side of the heat range:

    http://www.federalmogulmp.com/en-US/Tec … 0Chart.pdf

    Also maybe I am wrong, been there many times before, but the D9 is an 18mm plug and the W10 is 7/8-18.

    I did not take the time but they are not the same???? Are they?

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