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100 % Genuine Denso Iridium Power

IKH series
IKH16. IKH20. IKH22. IKH24. IKH27
  • 14mm dia. X 26.5mm length long reach type.
  • For Subaru 3 Liter, Nissan, Peugeot, Citroen, and Yamaha Marine.
  • IRIDIUM TOUGH VKH16, VKH20, and VKH22 are also on sale.
IK series
IK16. IK20. IK22. IK24. IK27. IK31. IK34. IK16G. IK20G. IK22G. IK16L. IK20L
  • Mainly used for cars. ISO type.
  • 14mm dia. X L19mm length type.
  • IK22 and above are for tuned engines, with a spark gap of 0.8mm.
  • IK16G, IK20G, and IK22G have a solid, stainless steel gasket (mainly used with Honda engines).
  • IRIDIUM TOUGH VK16, VK20, and VK22 are also on sale at the same time.
  • IK-L is extended type (spark position 5mm)
IW series
IW16. IW20. IW22. IW24. IW27. IW29. IW31. IW34
  • 14mm dia. X L19mm length fully threaded type.
  • IW16 to 22 are focused on ignitability with a 1.5mm projection, whereas IW24 to 34 are focused on heat resistance with a projection of -1.5mm.
  • The spark position of IW24 to 34 is projected 0.5mm compared to normal (1.0 → 1.5mm).
  • Equipped with 0.4 mm diameter iridium center electrode for improved ignitability.
  • IRIDIUM TOUGH VW16, VW20, and VW22 are also on sale.
IXU series
IXU22. IXU24. IXU27
  • 12mm dia. X L19mm length fully threaded type.
  • The insulator is fully projected (1.5mm), creating a wide heat range and greater ignitability.
  • 16mm Hex
  • For use with small cars and imported motorcycles such as Ducati.
  • IRIDIUM TOUGH VXU22, VXU24 are also on sale.
IT series
IT16. IT20. IT22. IT24. IT27
  • 14mm dia. X L17.5mm length tapered seat type.
  • For use with GM, Ford, Citroen, Jaguar, Peugeot, Volvo, Mercedes- Benz, Lancia, Renault, Audi, and Mazda.
  • IRIDIUM TOUGH VT16, VT20 are also on sale.
(1) Specifications Include Terminal
A terminal nut is attached that fits with most of the world's spark plug cables. Please remove the nut for installations that do not require one. (The terminal nuts on the IWM and IK-G types are solid parts and cannot be removed.)
(2) Built-in, Highly Reliable Resistor
All IRIDIUM POWER plugs include a highly reliable, 5,000 ohm monolithic resistor specification to reduce electromagnetic noise that may affect electronic devices. (For all plug types)
(3) Highly Corrosion Resistant, Burnished Nickel Plating
The plug housing is plated with burnished nickel, the same as plugs used for racing. It is highly resistant to corrosion and rust even while touring in continually rainy weather and during motocross events. (Low-heat range types excluded)
(4) Projected Center Electrode
In order to improve ignitability, the center electrode protrudes more than with conventional type plugs This improves both acceleration response time and performance.
(Only with: IU31, IUH24, IUH27, IX22, IX24, IX27, IUF22, IUF24, IWF22, IWF24, IWF27, IW24, IW27, IW29, IW31, and IW34)
(5) Taper-cut Ground Electrode
The tip of the ground electrode is cut to a fine taper to reduce the adverse effects of quenching, which greatly improves fuel ignitability. Also, because of the streamlined, taper-cut shape, the fuel-air mixture spreads more evenly in the gap, resulting in steady, reliable igniting of combustion.
(excluding IUF27A, IUF31A, IU24A, IU27A, IU31A, IY24, IY27 & IY31)
(6) U-Groove Ground Electrode
The U-shaped groove on the ground electrode insures that the inside surface area is large enough to generate the flame kernel. This shape enables lower voltage needed to cause the spark and results in excellent ignitability without increasing the size of the spark gap. (excluding IUF27A, IUF31A, IU24A and IU31A)
(7) Insulator Projection
The projection of the insulator is optimally designed based on each plug's thermal value. This corresponds to requirements unique to thermal value, such as self-cleaning ability at lower thermal values, and heat resistance at higher thermal values. (For all plug types)
(8) 0.4 mm Diameter Iridium Center Electrode
Using a new iridium alloy with a very high melting point, the tip of the electrode can be made very fine. This enables the reduction of voltage necessary to cause the spark, and greatly improves ignitability. Moreover, the special iridium alloy used was developed by DENSO with the following patented processes (for all types): Japan (2877035, 2921524, 3000955), U.K. (2302367), U.S.A. (5977695, 6078129, 6093071, 6094000, 6262522), People's Republic of China (961022841), Republic of Korea (0292083).
(9) 360° Laser Welding
The process used to mount the iridium tip is a highly reliable "All-around Laser Welding" process that is able to withstand all kinds of driving conditions. (For all plug types)