DENSO’s patented Iridium alloy, with an extremely high melting point, is used to create the world’s smallest center electrode, thus allowing the voltage requirements to be significantly reduced, and greatly improving ignition performance. DENSO’s Iridium alloy achieves its particular characteristics through a unique material structure and production method which bonds the alloy in the most reliable patented process.
DENSO’s patented 360° laser welding process to permanently affix the Iridium center electrode tip creates a bond so reliable the electrode resists wear even in the harshest racing conditions.
Platinum has a higher melting point than the nickel alloys used in conventional spark plug ground electrodes. DENSO’s 100% Platinum ground electrode reduces wear and problems such as melting the ground electrode under severe race conditions. In addition, the platinum alloy used in the 0.8mm ground electrode is produced without the need for fusing or bending, which increases durability and virtually eliminates residual stress.
A small gap has been developed around the tip of the center electrode and insulator. If the plug develops carbon build-up and bridging occurs, electrical discharges in this section burn away any carbon deposits and clean the insulator. This technology has been patented by DENSO (Japanese patent No. 2727558)
For racing vehicles, starting problems caused by carbon deposits and bridged plugs before the start of a race can be fatal. To prevent this, a film of silicone oil is applied to the insulator. The water-repellent properties of the silicone oil keep the insulator surface free from moisture and carbon to prevent any losses in plug insulating performance.
A bevel on the side of the housing has been increased in size to improve resistance to abnormal combustion. Furthermore, they also make possible the discharge of residual gases and entry of fresh gases; improve self-cleaning performance, which helps reduce plug fouling.
Through DENSO’s involvement in motorsports, we have engineered a new insulator that is 20% stronger than insulators previously used, achieving unsurpassed reliability.