Spark plug extender colour question. | FerrariChat
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Spark plug extender colour question.

Discussion in '308/328' started by Tifosi2011, Jun 3, 2012.

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  1. Tifosi2011

    Tifosi2011 Formula Junior

    Apr 3, 2011
    307
    Burnaby, BC Canada
    Full Name:
    John
    #1 Tifosi2011, Jun 3, 2012
    I have black spark plug extenders in my 85 QV 308. I am a little confused over what colour they really should be. Should they be red? Or can I stay with black? The reason why I'm asking this is because my car has an idle misfire that won't disappear unless the car has reached 3500+ RPM. Is this a definate result of faulty extender(s)? Or should I be looking somewhere else for the misfire?
    And can anyone direct me to where I may purchase some proper extenders ASAP? I will need them soon as I am bringing my car to a show on Fathers Day.
     
  2. DWPC

    DWPC Formula Junior

    Mar 10, 2011
    733
    Sedona AZ
    Full Name:
    Dennis
    #2 DWPC, Jun 4, 2012
    I like the extenders sold by Kingsborne (P.N. WSP-4813 for 308QV). AFAIK, they should be black for QVs. They are Italian sourced and have a much smaller plug clip that reduces arcing.

    www.kingsborne.com go to p. 41 in their catalog pdf
     
  3. rcraig

    rcraig F1 Rookie

    Dec 7, 2005
    2,960
    Maryland
    Full Name:
    Bob Craig
    #3 rcraig, Jun 4, 2012
    The weird thing is that I bought some from them within the last year and they were black for my 79 2V 308 carb car. I spoke with them on the phone and the black ones are the ones they recommended.

    I have never seen a 2V with red extenders.

    They work perfectly by the way.
     
  4. pmichaelg

    pmichaelg Formula Junior

    Apr 21, 2006
    256
    Minnesota
    Full Name:
    Michael
    #4 pmichaelg, Jun 4, 2012
    I've used black (part #115647) in my '85 QV with success. You can get them from the usual sources (Ricambi, T. Rutlands, etc.).
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,931
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #5 Steve Magnusson, Jun 4, 2012
    A prior thread for reference that shows that the plastic color of the extender has no direct relationship to the resistance of the extender:

    http://ferrarichat.com/forum/showthread.php?t=212698

    Maybe it did at one time, but it doesn't anymore -- use an Ohmmeter to know what you have!

    What we haven't established, IIRC, with 100% certainty is which model uses what resistance extender, but I can say with 100% certainty that those models with MicroPlex ignition that use an extender (e.g., 328, 3.2 Mondial, TR) use the 0 Ohm extenders.
     
  6. TacElf

    TacElf Formula 3
    Owner

    Aug 15, 2010
    1,719
    Seattle area
    Full Name:
    Jeff
    #6 TacElf, Jun 4, 2012
    Yep, and the Kingsborne extenders are much more reasonably priced. That's one of the first things I did on this 328 when I got it.
     

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