Denso Iridium Power Performance Spark Plugs
Description:
DENSO's Iridium Alloy had all of the qualities to produce the world's best spark plug, but conventional tooling prevented DENSO from mass manufacturing. Due to the high melting point there wasn't a welding process hot enough to join the Iridium tip to the nickel base. Necessity to melt the Iridium to the nickel base forced DENSO to pioneer its third patent, the 360º Laser Welding Process, to provide a seal so reliable; the electrode resists wear even in the worst combustion conditions.
Features:
By harnessing the power of Iridium, DENSO is suddenly able to shrink the surface area of the center electrode - the critical component of a spark plug. Unlike a typical platinum plug that has a 1.1mm diameter center electrode, DENSO Iridium Power plugs have the world's smallest center electrode measuring 0.4mm in diameter. This means that the voltage requirements are decreased while firing performance is greatly improved.
Denso's patented U-Groove design changed the industry standard in the mid 1970s by providing a better design that virtually eliminates erratic starts caused by poor fuel mixture. The U-Groove results in less flame dissipation making the spread of the flame nucleus easier and therefore yielding greater firing energy. It gives the flame a groove to grow in, thereby creating a larger flame front for a complete combustion.
To help improve ignitability DENSO minimized the portion of the ground electrode that comes in contact with the flame nucleus. Because the area of the ground electrode where the tapered cut comes into contact with the flame nucleus is small, the heat lost to the electrode is lessened and firing performance improves dramatically. The surface area and weight of the ground electrode tip is reduced along with the load in terms of heat and vibrations. This means the spark plug can cope with heavier driving conditions.
In a never-ending effort to improve upon success, DENSO developed an Iridium alloy that is superior to platinum based on hardness, strength and melting point. The new Iridium alloy is composed primarily of Iridium with rhodium mixed in for oxidation wear. Pure Iridium has a melting point of almost 700ºC higher than platinum, and had the greatest potential for resistances against wear.
Iridium by itself is susceptible to oxidation wear at temperatures over 900ºC, however, ordinary driving around town an engine would never reach these temperatures. Further testing proved that Iridium alone would not meet DENSO's demanding standards. After testing other pure metals combined with Iridium, rhodium proved to be the best choice to meet the needs of DENSO's spark plug engineers.
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