What advantages does the tapered cut in the IRIDIUM POWER ground electrode have?
Ignitability is improved.
Also, the heat and vibrations experienced by the electrodes at combustion are decreased, enabling an increase in driving performance.
As explained in the answer to , to improve ignitability, an important characteristic of spark plugs, it is important to minimize the portion of the electrode that comes in contact with the flame nucleus.
Because the area of the ground electrode with tapered cut that comes into contact with the flame nucleus is small, the heat lost to the electrode is lessened and firing performance improves dramatically.
Also, the surface area and weight of the ground electrode tip is reduced and so the load in terms of heat and vibrations is lessened.
This means that the spark plug can cope with heavier driving conditions.