What are NGK Iridium Spark Plugs and why are they better than the standard spark plugs?
Relatively recent advances in fabrication techniques have enabled the use of Iridium – an incredibly hard precious metal, for the construction of spark plug electrodes. Laser technology is used to weld the Iridium tip to spark plugs manufactured by both Denso and NGK. It’s worth noting that spark plugs can’t increase the potential power that an engine can generate but a more efficient spark will provide more efficient combustion and associated performance and economy benefits. A poor spark from a worn or low grade spark plug will reduce efficiency. An Iridium plug will produce a more efficient spark. Notable properties of Iridium are its melting point – approximately 2450 degrees C, considerably higher than Platinum, and it’s strength – approximately 8 times that of platinum. The table below compares the characteristics of Iridium with those of other precious/semi-precious metals commonly used in the construction of spark plugs. Due to the properties of Iridium, the spark plugs centre
