High Performance Iridium Spark Plug
Heat Range 8

ULTRA-FINE 0.4mm DIAMETER IRIDIUM ELECTRODE
Using Iridium, which is 6x harder & 8x stronger than platinum, the tip can be shrunk to only 0.4mm. This means the voltage requirements are decreased while firing performance is greatly improved.

U-GROOVE
A U-Groove has been cut inside the ground electrode to maintain the large volume of space required to form the nucleus of a flame. While still keeping the required voltage low, this technology enables excellent firing performance without increasing the spark gap.

360° LASER WELDING
The extreme hardness & high melting point of Iridium prevented the use of this incredible metal, until DENSO perfected the Laser Welding Process, which provides a 360 Degree seal so reliable the electrode resists wear even in the harshest conditions.

FEWER VOLTS MEANS MORE AMPS
Denso Iridium spark plugs require on average 5,000 fewer volts to fire than conventional spark plugs. Less power is required to fire DENSO Iridium Power Plugs, and coupled with our patented U-Groove technology, the use of Iridium alloy, the tapered cut, and the ultra fine 0.4mm diameter electrode translates to increased horsepower throughout the dyno range.