P11 Brisk Spark Plugs Spark Plugs Iridium Premium + The use of combination of centre electrode with Iridium contact and ground electrode from Yttrium alloy with cooper core cut to spark plug centre decreases demand for voltage, it opens spark gap into combustion chamber and suppresses significantly flame extinguishing effect at cold starts. In so doing the change interval 100,000 km is maintained. WORK OF EXIT The material used to the spark plugs has a major impact on lifetime and functional properties. While precious metals such as Platinum and Iridium are very resistant to wear, but have a considerable demand for high voltage generated by the ignition system. The combination of Iridium center electrode and ground electrodes of special design with Yttrium alloy which is based on Nickel is an ideal solution for maintaining lifetime and spark plug performance improvements. VOLTAGE REQUIREMENT/TOTAL VOLTAGE REQUIREMENT The requirement for power generated by the ignition system is also influenced by the geometric shape of the spark gap. Optimal combination of the spark gap and the reduced demand for form by appropriate choice of electrode material effect synergic on improvement of spark plug performance. THE AREA CARRYING OFF HEAT FROM COMBUSTION CORE IN INITIAL PHASE AT A COLD START Significant surface reduction of electrodes from which the heat is carried off at cold starts eliminates the flame extinguishing. Significant improvement of cold starts.