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Thread: Spark plug gap on 911E with carbs

  1. 10-27-2007, 10:32 AM #1
    RPMClassic
    RPMClassic is offline
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    Spark plug gap on 911E with carbs

    Trying out some different heat ranges and spark plug brands. The DP3's are too cold, although they are the suggested one in the owners manual. Stock gap is .024. I know that cars running an MSD can run gaps up to .040. Can a stock CD box handle wider plug gaps - say a .032?
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  2. 10-27-2007, 03:41 PM #2
    Steve@Rennsport
    Steve@Rennsport is offline
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    Hi:

    DP3's are FAR too cold for street use; thats for driving at WOT for periods of time. Use a Bosch 5 (or) 6 range plug or the equivalent NGK.

    The Bosch CDI will reliably fire plug gaps up to .032 but I would not go beyond that unless you replace it with an MSD-6 of some kind.

    MSD's (using the correct coil) will comfortably fire gaps to .075 but I use .040-.045 for best idle, drivability, and HP.
    Steve Weiner
    Rennsport Systems
    Portland Oregon
    503.244.0990
    E-mail: porsche@rennsportsystems.com
    http://www.rennsportsystems.com
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