produced in state of the art manufacturing facilities.
Below is a cross-section of the highlights of the Iridium plug.
 | |  | |  | |  |
1- Insulator 4- Copper-Cored Center Electrode 7- Tapered Cut
2- Five-Rib Design 5- U-Groove Ground Electrode 8- 360° Laser Welding
3- Copper-Glass Seal 6- Patented Iridium Center Electrode 9- 100% Pre-Fired
Ultra Fine Electrode
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.
U-Groove Technology
Our 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.
On a conventional plug, the flat electrode design crushes the spark, and the overall volume of the flash
front is smaller.
The conventional method to improve firing was to increase the spark gap. This has a negative effect on
the spark. With a U-Groove firing can be greatly improved without increasing the spark gap.
Tapered Cut
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.
SAE Comparison of electrode sizes and voltage requirements
Iridium Plug (Ø 0.4) Iridium Plug (Ø 0.7)
Platinum Plug (Ø 1.1) Nickel Plug (Ø 2.5)
The figure on the above contains photographs of the discharge part of an ordinary spark plug, a platinum
spark plug and the two types of iridium spark plugs developed here.
the enquiry form at the top of this page.
Please state the make,model and year of your machine when
enquiring.
33 Lyde Green
Halesowen
West Midlands
B63 2PQ
Tel: 07762 539735
Email:bargainbiker@msn.com
Website:www.bargain-biker.com
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