512TR spark plugs, NGK DR8EIX or DCPR9EIX? | FerrariChat
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512TR spark plugs, NGK DR8EIX or DCPR9EIX?

Discussion in 'Boxers/TR/M' started by MannyGMT2, Dec 18, 2006.

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  1. MannyGMT2

    MannyGMT2 Formula Junior

    Feb 27, 2006
    429
    Montreal, Canada
    #1 MannyGMT2, Dec 18, 2006
    Hey all

    I was just about to order some NGK plugs for my 512TR

    From previous posts, a few of you here have ... the Irridium DR8EIX

    On the NGK website,they also list the DCPR9EIX. So which one?


    also, for the gap, NGK lists 0.028, but isn't it supposted to be 0.033??

    any comments?

    thanks
    Manny
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,547
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Dec 18, 2006
    The only functional difference in those two NGK plugs is the heat range (8 vs 9 which is colder).

    The "C" just signifies that the external drive feature is a 5/8" hex shape rather than an 18mm? hex shape.

    Unless you are really flogging your engine for high output for extended time periods, the "8"s should be fine.

    With regard to the gap, the IX center electrode is so small and brittle that NGK recommends to not even try to measure or adjust it in the conventional way (i.e. making physical contact with a wire/flat gauge). The only spec I've seen is .024"-.028" in the 512TR OM -- what is your reference for the .033" value?
     
  3. MannyGMT2

    MannyGMT2 Formula Junior

    Feb 27, 2006
    429
    Montreal, Canada
    #3 MannyGMT2, Dec 18, 2006
    Ok... thanks for the info, I didn't know about the heat range 8 vs 9.

    as for the gap 0.033, i was found it from an old post

    http://www.ferrarichat.com/forum/showthread.php?t=50800
    thread #18
     
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,547
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #4 Steve Magnusson, Dec 18, 2006
    It's probably not a big thing either way, but I can't recall anyone posting that they had problems on their TR/512TR at the standard gap that was "solved" by going larger. The modern injection systems make plenty of voltage, and modern injection systems are good about not fouling plugs.
     

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