Ignitability That’s a Cut Above With DENSO’s very own U-Groove ground electrode for better spark performance. This corresponds to requirements unique to thermal value, such as self-cleaning ability at lower thermal values, and heat resistance at higher thermal values. The projection of the insulator is optimally designed based on each plug's thermal value. (excluding IUF27A, IUF31A, IU24A and IU31A) This shape enables lower voltage needed to cause the spark and results in excellent ignitability without increasing the size of the spark gap. The U-shaped groove on the ground electrode insures that the inside surface area is large enough to generate the flame kernel. 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) The tip of the ground electrode is cut to a fine taper to reduce the adverse effects of quenching, which greatly improves fuel ignitability. Moreover, the special iridium alloy used was developed by DENSO This enables the reduction of voltage necessary to cause the spark, and greatly improves ignitability. Using a new iridium alloy with a very high melting point, the tip of the electrode can be made very fine. 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)Ħ0.4 mm Diameter Ultra-fine Iridium Center Electrode In order to improve ignitability, the center electrode protrudes more than with conventional type plugs. 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. It is highly resistant to corrosion and rust even while touring in continually rainy weather and during motocross events. The plug housing is plated with burnished nickel, the same as plugs used for racing. (For all plug types)ģHighly Corrosion Resistant, Burnished Nickel Plating (The terminal nuts on the IWM and IK-G types are solid parts and cannot be removed.)Īll IRIDIUM POWER plugs include a highly reliable, 5,000 ohm monolithic resistor specification to reduce electromagnetic noise that may affect electronic devices. Please remove the nut for installations that do not require one. A terminal nut is attached that fits with most of the world’s spark plug cables.
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