Audi R8 – Hybrid spark plug

NGK Spark Plugs (UK) Limited, the leading spark plug manufacturer, has announced that it has been selected as the exclusive OE supplier of hybrid type spark plugs to the new Audi R8, Audi’s first mid-engine series production sports car.

NGK developed a hybrid type spark plug to meet the high demands of this high-revving engine. The PFR7W-T which sparks the R8 combines the features of precious metal spark plugs with a semi-surface technology developed by NGK to solve the carbon fouling problems associated with direct injection engines. In this design a conventional ground electrode is supplemented by two smaller ground electrodes close to the nose of the ceramic insulator. If carbon deposits prevent the spark from firing at the primary ground electrode then the spark will travel across the insulator to one of the secondary electrodes and burn off the carbon deposit until sparking takes place again at the primary electrode, so guaranteeing reliable ignition.

An exceptionally small diameter platinum centre electrode 0.6mm minimises the required ignition voltage and provides an optimal expansion of the flame front within the combustion chamber. Additionally, the high durability of the platinum electrode allows an extended service life of 60,000 miles. The spark gap remains virtually the same over the plugs complete lifetime and therefore offers perfect ignition results.

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