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  1. #1
    Join Date
    Jun 2007
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    Porthcawl, S Wales
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    Spark Plug Problem

    Hi, my plugs are ngk blitz iridium with a 7 (heat grade?) and they are brown after about 2,000 miles. Its as though they are rusting from the thread where the spark comes from all the way to the tip. Is this normal? I thought a darkish grey was right.

    Are they getting too hot? Would putting awarmer plug in work (heat grade 8)? or is it supposed to be cooler plug?

    The car is running 1bar and has had lots of upgrades, bigger injectors, fuel pump, apexi ecu, fmic and other mods (exhaust, breathing etc).

    Cheers, Keith

  2. #2
    Join Date
    Jun 2006
    Location
    Kettering
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    brown ish is fine.

    white spotting is when you've got problems and they're getting too hot.

    http://www.4x4review.com/quads/tech/SparkPlugs.asp


  3. #3
    Join Date
    Jun 2007
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    Porthcawl, S Wales
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    Thanks Dazz, I had looked online but the pics I found never mentioned the browning being normal.

    Any idea wht the gap should be?

  4. #4
    Join Date
    Sep 2009
    Location
    New Zealand
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    Rule of thumb for Import SR20 engine is 0.044" gap ( 0.044 inch = 1.11 millimeter)

    this can depend on what use the car has street or race, also the plug type as well.

    Nissan OEM recommend 0.035inch or 0.9 millimeter, i will assume this is on a basic NGK plug not a platinum.
    Last edited by spoonman; 12-10-2009 at 00:02.

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