Iridium IX Spark Plug
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NGK Iridium IX Spark Plug

Part No. 3690 Warranty Details  

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Laser-welded iridium center electrode is resistant to heat, corrosion and electrical wear. The tapered ground electrode minimizes quenching. Provides outstanding acceleration, high fuel efficiency and durability.

Product Features:
  • 0.6 mm iridium-tip center electrode provides durability and a high melting point
  • Taper-cut ground electrode shape provides improved flame reproduction
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Center Electrode Core Material:Copper Core
Center Electrode Tip Material:Iridium
Electrode Core Material:Iridium
Electrode Tip Material:Iridium
Gap Size:0.040 in
Ground Configuration:Standard
Ground Electrode Core Material:Nickel Core
Ground Electrode Quantity:1
Ground Electrode Tip Design:Taper Cut
Ground Strap Quantity:1
Hex Size:5/8
Manufacturer Heat Range:7
Reach:17.5 mm
Resistor:Yes
Seat Type:Tapered
Shorty Spark Plug:No
Thread Diameter:14 mm
Tip Configuration:Solid
Type:Iridium IX
Wrench Diameter:5/8 in

REVIEW SNAPSHOT®

by PowerReviews
NGKIridium IX Spark Plug
 
5.0

(based on 2 reviews)

Ratings Distribution

  • 5 Stars

     

    (2)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

Reviewed by 2 customers

Displaying reviews 1-2

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5.0

Great plugs for boosted applications

By 

from NJ, USA

About Me Auto Enthusiast

Verified Buyer

Pros

  • Durable
  • Easy To Install
  • Improves Engine Efficiency
  • Increases Power
  • Lightweight

Cons

    Best Uses

    • Everyday Driving
    • Performance Driving

    Comments about NGK Iridium IX Spark Plug:

    I use these plugs on my 03 Cobra which runs about 13-14psi on a ported blower. NGK makes outstanding plugs. And with a 30% of coupon from Advanced, no one sells NGK iridium plugs cheaper than Advanced.

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    5.0

    Big fan of the TR7ixs

    By 

    from Central NJ

    About Me Auto Enthusiast

    Verified Buyer

    Pros

    • Easy To Install
    • Improves Engine Efficiency
    • Increases Power
    • Pre-detonation Insurance

    Cons

      Best Uses

      • Boosted Applications
      • Everyday Driving
      • Performance Driving
      • Racing
      • Replacement

      Comments about NGK Iridium IX Spark Plug:

      I recommend this plug to all 03-04 Cobra owners who have a 2.8 or 2.76 pulley, whether ported blower or stock Eaton. No need to close the gap either. I run these plugs with the out of the box gap (.034 - .036) Fantastic plug. I change them about every 10k - 12k.

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