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Thread: Spark Plug Longevity

  1. #1
    Junior Member
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    Default Spark Plug Longevity

    After 300 hours TT we are only averaging 50hrs between plug changes. Anybody getting better - and if so what kind of plug?

  2. #2
    Senior Member turbopilot's Avatar
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    Default Re: Spark Plug Longevity

    What plugs are you using? See this post.
    Bob Anderson, CC11-00435, N94RA

  3. #3
    Administrator Pete D's Avatar
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    Default Re: Spark Plug Longevity

    Iridium plugs are now standard equipment on all factory Carbon Cub SS for the last year and a half or two years.
    Pete Dougherty
    Customer Support Manager
    Cub Crafters Inc

  4. #4
    Senior Member randylervold's Avatar
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    Default Re: Spark Plug Longevity

    Bob, you should be able to get 400 hrs or so out of the Iridium plugs.
    Randy Lervold

  5. #5
    Senior Member turbopilot's Avatar
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    Default Re: Spark Plug Longevity

    Quote Originally Posted by randylervold View Post
    Bob, you should be able to get 400 hrs or so out of the Iridium plugs.
    I happened to just check mine. No measurable wear at 60 hours.
    Bob Anderson, CC11-00435, N94RA

  6. #6
    Senior Member
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    Default Re: Spark Plug Longevity

    I am at 155hrs on the Iriduims and all good and clean. Best Gary

  7. #7
    Senior Member Dan L's Avatar
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    Default Re: Spark Plug Longevity

    Curious if anyone has been using the Autolight XS4063DP iridium plug in the O-340? Pricing is in the $7-$8 range. Same specs as the NGK BR8ECMIX iridium plugs.
    Flying Carbon Cub EX #11 since 2011

  8. #8
    Senior Member Dan L's Avatar
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    Default Re: Spark Plug Longevity

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    121DBE97-3F2D-4B53-AC39-C49D8387D51D.jpg

    I bought a set of these Autolite iridium plugs for $7.49 each (including shipping) from NAPA online. I didn’t get them installed until this past weekend and made a flight today to test them. Everything seemed normal. I’ll check them when I do my Condition Inspection in January.

    They’re longer overall but have the same thread reach.

    I changed the spark plug/coil leads too. I had just about 500 hours on the previous set and my experience says don’t go longer than that or some misses will soon develop.

    The old iridium plugs had about 300 hours on them and were due too.
    Last edited by Dan L; 11-22-2022 at 12:38 PM.
    Flying Carbon Cub EX #11 since 2011

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