Experience more power and torque with the DENSO Iridium Racing elite spark plug. 0.4mm Iridium-Rhodium alloy center electrode requires less voltage to fire and increases firing performance. 100% pure Platinum 0.8mm ground electrode reduces risk of melting the plug during harsh racing conditions. As well as increased engine efficiency and fewer misfires, the Iridium Racing best demonstrates its performance improvement during acceleration.

Improved Acceleration

With an ultra-fine, 0.4 mm diameter center electrode, Iridium Racing plugs are the realization of superb ignition performance and reguired voltage at unparalleled levels. Misfires have been controlled and will allow you to have steadily high levels of response and increased acceleration.

Improved Horsepower

Through superb ignitability and reguired voltage, non-firing and misfires under a variety of conditions has been greatly reduced. As a result, combustion conditions have improved dramatically, increasing enginen output.

Choose the Right Racing Plug

Generally, electrodes that project into the combustion chamber have better ignitability and have better performance. However, because of more exposure to high temperature combustion gases and because ground electrode becomes longer, heat resistance and durability decrease. The higher the level of tuning, the greater the need is to use a less projecting type.

As the level of tuning is increased, so does the need for higher heat range.

Built-in, Highly Reliable Resistor

All IRIDIUM RACING plugs specify a resistor, and contain a highly reliable monolithic-type resistor that blocks noise that may affect electronic devices. (IW06 has no resistor.)

Highly Corrosion Resistant, Burnished Nickel Plating

Burnished nickel plating on the housing, a high level of corrosion resistance has been realized. Also, because the amount on the threads is low, the damage to the female thread in the cylinder is reduced.

0.4 mm Diameter Ultra-Fine Iridium Center Electrode

The center electrode tip is able to be made fine using a new iridium alloy with a high melting point. The required voltage is reduced, and ignitability is improved greatly.

All-platinum Ground Electrode

Compared to the nickel alloy used in conventional spark plugs, the high melting point of platinum will reduce such problems as ground electrode melting and wear. Also, the 0.8mm platinum alloy is welded on and gapped without any bending, reducing residual stress and increasing durability.

Insulators for Racing

By using a new, strengthened insulator which was developed during numerous and repeated
testing during racing trials, strength is improved by 20%.

Spark Cleaning Pocket

Between the center electrode and the insulator, a small pocket has been opened around the tip
clearance. When there is carbon fouling or deposition, this part will discharge and burn off the carbon, restoring electrical resistance.

Silicone Oil Coating

During the start of the race, non-starting from carbon fouling and carbon deposits can be fatal. To stop this, the insulator has been coated with a silicone coating. Using the water repellency of silicone, the insulator surface is isolated from moisture and carbon, preventing a decrease in resistance.

360 degree Laser Welding

The process used to join the iridium tip is a highly reliable 'All-around Laser Welding' process that is able to withstand various kinds of driving conditions.