We have selected the NGK Iridium IX Spark plug to run with MINI Cooper Ss equipped with the high performance supercharger pulley. This Iridium IX spark plug is rated a step 'cooler' than stock to reduce the likelihood of detonation, features a .6mm iridium center electrode which offers superior ignitability without sacrificing durability. The tapered ground electrode of the spark plug increases flame kernel expansion, while the superior heat range design is ideally suited to the demands of high performance MINI Cooper S environments. Spark plugs come pre-gapped, but should be checked for .035" gap before installation. Sold individually. 4 required per car.
Advantages of Iridium spark plug types
Because of the properties of Iridium, the spark plugs centre electrode can be made with a much smaller diameter than with platinum types (0.6mm), Gold or gold palladium and copper/nickel types. This means that spark plugs potential difference is more concentrated and hence less 'spark jump' voltage is required - this can be as much as 5,000 volts less than with standard plug types. Ignition is improved and less strain is placed on the ignition system. Benefits of improved ignition/combustion include better fuel economy, increased power/acceleration and especially better throttle response.
Iridium: 8 times stronger than platinum, 6 times harder, and with a melting point 1200 degrees higher. New laser welding techniques make it possible to make a spark plug with an iridium electrode. The result is a plug that requires less voltage to spark, burns more of the fuel in the cylinder, and can spark at LEANER air/fuel mixtures, resulting in higher horsepower and better gas mileage. Although the plugs are expensive, you don't have to change them as often as garden variety spark plugs. The iridium electrode is extremely resistant to erosion, so it can last MUCH longer than a normal plug. (Longevity will vary by usage, fuel mixture, and other factors.)
Sold each. Order 4 per car.
Subject to manufactures warranty.
For a list of all spark plug options, see NME3010.
Use of anti-sieze compound with proper torque is highly recommended when installing spark plugs.
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