Iridium Racing Spark Plug

The Denso IK01-31 is an iridium racing spark plug engineered for demanding applications, particularly in hard-core racing environments. Its construction centers around an ultra-fine 0.4mm diameter iridium alloy center electrode, which significantly reduces the voltage needed for ignition, thereby enhancing overall engine performance, acceleration, and output. Complementing this is a 100% platinum 0.8mm ground electrode, designed to withstand severe driving or race conditions and minimize wear. Further enhancing its performance and durability, the IK01-31 features a specially hardened insulator that is 20% stronger than standard insulators, enabling it to handle extreme compression and boost levels. The design incorporates Denso's patented self-cleaning electrode feature and a silicone oil-coated insulator to actively repel moisture and carbon buildup. A five-rib insulator design is included to prevent flashover, while a copper-glass seal ensures a robust, gas-tight bond between the center electrode and the insulator. The machine-rolled threads are implemented to prevent seizing or cross-threading during installation and removal, ensuring ease of use and longevity. Product specifications include a 14mm thread diameter with a 1.25mm pitch, a gasket seat type, and a 19mm (3/4") reach. The hex size is 5/8" (16mm) with a solid terminal type. The spark gap is set at .028" (0.7mm), and the plug includes a 5k Ohm resistor. This spark plug is identified by heat range 31. Installation torque specifications are provided: 26-30 lb. ft. for cast iron and 15-22 lb. ft. for aluminum cylinder heads.