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Applying thermal conducting paste to a spark plug.

in 912 / 914 Technical Questions 13 years ago

  • Re: Applying thermal conducting paste to a spark plug.

    by » 12 years ago

    In our opinion, the video of the heat-sink paste shows application of waaaay too much paste. We would suggest using about 50% less. Not in threads covered, but in the amount on each thread.
    "Less-is-more" to quote... uh... whoever.
      
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  • Re: Applying thermal conducting paste to a spark plug.

    by » 12 years ago

    A little less wouldn't hurt at all, but if you view the video in full screen you'll see the paste only fills the gaps in the individual threads and the tops of the threads are still showing. The bottom 1/3 of the plug is bare and the top area around the compression ring is bare. This would be the max for me, but I don't think it's in excess. One of the functions of the paste is to fill the extremely small gaps between threads of both metallic materials so it can do a proper thermal transfer. Open or bare threads can't contribute to this function.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Applying thermal conducting paste to a spark plug.

    by » 12 years ago

    Yes, Roger... we agree.

    Everyone should remember... the paste is a thermal conductor, NOT an electrical conductor.
    Therefore, the paste should NOT be near the compression ring at the top of the plug (for good electrical conduction) and should be AWAY from the lower threads (to prevent migration to the electrodes). The thread section of the plug (at its center) is where the paste is most useful.
      
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