NGK Laser Iridium spark plugs

Discussion in 'General Discussion' started by William Strmiska, Apr 16, 2018.

  1. William Strmiska

    William Strmiska New Member

    2
    Mar 21, 2018
    Boatless
    Boatless
    New to CSR and this is my first post. I just purchased a new to me 2005 280 Sundancer with twin MPI 260 up each. My question is what spark plugs do you guys and gals use in your engine or engines. Do any of you run the NGK Laser Iridium ITR4a-15 and if you do how do you like the performance. Any and all answers greatly appreciated. Thanks
     
  2. Little Ducky

    Little Ducky Active Member

    614
    Jun 5, 2017
    Chattanooga TN/Dickson TN
    1998 SeaRay 290 Sundancer
    Twin EFI 5.0L w/Alpha 1 drives
    I would stick to the tried and true that is listed in your engine manual.

    $50 vs $200 for a spark plug change.

    Not sure the added cost of using an exotic spark plug will give any benefit to a cruiser boat.
     
  3. Espos4

    Espos4 Active Member

    262
    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    Agreed.

    Whether automotive engine or marine engine, I have found it best to use the oem plugs.
     
  4. scoflaw

    scoflaw Well-Known Member SILVER Sponsor

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Not sure about 2005, but my 2006 280 called for iridiums. Changing the plugs in that boat is no joke and the iridiums will be the last set of plugs he will have to buy. You can find them on line for about 8 bucks each.
     
  5. mjoplin

    mjoplin Member

    113
    Oct 10, 2016
    Houston, TX
    2005 Sundancer 280
    Twin 4.3 Mercruiser
    I reached out directly to the Mercruiser folks for their latest recommendation (changed from the original recommended plugs). What they sent back for my 4.3MPI was the NGK Iridium:

    Michael,
    Our spark plug recommendation for this engine is the NGK ITR4A15.
    Thanks,
    James
    MerCruiser Consumer Support
    2017-00006892
     
  6. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    +1 in our ‘06 260DA-350 Mag. I found them on eBay for around $7. Cranking and throttle response improved.

    Bennett
     
  7. liv2ryde100

    liv2ryde100 Member

    236
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    anyone using these plugs in the 8.1 motors?
     
  8. juggernaut1

    juggernaut1 Member PLATINUM Sponsor

    668
    Apr 19, 2015
    Perth, Western Australia
    2006 38 Sundancer
    8.1S / ZF 63V Drives
    Yes I'm using NGK TR55IX (7164) in the 8.1's......and as recommended by the local Merc tech. I had them changed when I bought the boat 3 years ago and still starting and running sweet.
     
    Last edited: Apr 17, 2018
  9. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    Yes. They last a long time.
     
  10. liv2ryde100

    liv2ryde100 Member

    236
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    ok great thanks!
     
  11. mnm99

    mnm99 Active Member SILVER Sponsor

    Oct 2, 2015
    Long Island
    2004 340 SeaRay Sundancer
    Twin 8.1 Merc
    I tried the Iridium in my 496. I saw a noticed a difference in start up can cruising. Just felt much smoother. I have 2 motors and only tried them in one last season. This winter I replaced both. (yes I replaced the ones I just Installed last season also..I just want the same run time on both) They were like $5.50 with the 20% off online at Advanced Auto. When I took the old ones out, they still looked new. Here are a pic of my NGK with only one season. Take a close look at the tip. And the brown hot spot. This is only 40 hrs old/ 1 season. plug.jpg
     
  12. juggernaut1

    juggernaut1 Member PLATINUM Sponsor

    668
    Apr 19, 2015
    Perth, Western Australia
    2006 38 Sundancer
    8.1S / ZF 63V Drives
    Sometimes I wished I lived in the US - but the weather is better in Oz :p:

    NGK Iridium IX Spark Plug - TR55IX
    105456


    WRITE A REVIEW
    Was $24.88 EACH
    Now $21.14 EACH Ends 27/04/18
     

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