Plugs | FerrariChat

Plugs

Discussion in 'Boxers/TR/M' started by boxerman, Jul 21, 2025 at 9:09 PM.

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  1. boxerman

    boxerman F1 World Champ
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    May 27, 2004
    19,734
    FL
    Full Name:
    Sean
    What plugs are you all using these days.
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    BANNED Lifetime Rossa

    Jan 11, 2001
    26,822
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    Might help if you specify which F model...
     
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  3. 2dinos

    2dinos F1 Rookie

    Jan 13, 2007
    3,030
    DeJa'Vu (I just put this in the last thread)

    I'm a fan of NGK Iridium. Heat range: I use the 7's. Lower number has more thermal isolation from head and runs hotter. Autostrada, autobahn or track ---> 8 , Slow running, or maybe a bit of oil present, ----> 6 or 5. As far as gap: the MSD puts out a strong spark, and can jump what ever gap you challenge it with. Larger gap means higher spark voltage which is harder on ignition components. I've been at .028" w good results. Curious what others suggest.
     
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  4. boxerman

    boxerman F1 World Champ
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    May 27, 2004
    19,734
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    Sean
    I have ngk iridium
    8s on the shelf so will put those in. I remember years ago 8 fouled up at ties so went to 7s.

    slow running or a bit
    Of oil present I guess 7s. Mostky not slow running, but backroads so only 3rd and 4th 3500-6500 rpm.
     
  5. bjunc

    bjunc Formula Junior

    Jun 18, 2023
    458
    Miami, FL
    Full Name:
    Robert
    I use NGK BP7ES in my BBi. I haven't had any issues, but I've also not experimented much to see if there's a better choice.
     
  6. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,104
    Cowboy Capitol of the World
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    Brian Crall
    8s are too cold for a Boxer.
     
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  7. boxerman

    boxerman F1 World Champ
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    May 27, 2004
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    Got some BPR7Es.
    Just finishing up the neatening and hiding of the wiring from the MSD. Will do the plugs and see how it all runs tomorrow am.
     
  8. bjunc

    bjunc Formula Junior

    Jun 18, 2023
    458
    Miami, FL
    Full Name:
    Robert
    Are you not using the spark plug extensions with the resistor?
     
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  9. DWR46

    DWR46 Formula 3
    Honorary

    Jun 19, 2012
    2,041
    NGK has pretty well discontinued NON-Resistor spark plugs for a number of styles.
     
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  10. bjunc

    bjunc Formula Junior

    Jun 18, 2023
    458
    Miami, FL
    Full Name:
    Robert
    Oh right, I forgot about that (I have a few spare sets).

    Curious empirical evidence from everyone else, but I wonder if 5k spark + 5k extension + older wires + misc. (oxidized distributor cap, etc. etc.) can make ignition flaky.
     
  11. DWR46

    DWR46 Formula 3
    Honorary

    Jun 19, 2012
    2,041
    Robert: to address your question about "flaky" ignition, the answer is absolutely! We routinely resistance test the spark plug wires on every car. Many times the wire itself is OK, but the connectors on the ends are not secure and making good contact.
     
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  12. bjunc

    bjunc Formula Junior

    Jun 18, 2023
    458
    Miami, FL
    Full Name:
    Robert
    Sorry, that's a term we use in code to describe code that is unpredictable (sometimes works, sometimes fails).
     
  13. DWR46

    DWR46 Formula 3
    Honorary

    Jun 19, 2012
    2,041
    Robert: That is a perfect description for electricity!
     
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