2858 Spark-plug connector 2870 Spark plugs · The spark-plug connectors are fitted with On these surf

911 Fuel and ignition system 2 2858 Spark-plug connector 2870 Spark plugs The spark-plug connectors are fitted with On these surface-gap spark plugs, the 4 additional sealing lips above the spark earth electrodes are arranged laterally to plug. the ceramic. This makes the sparks (1) glide over the insulation surface and jump across a short air gap to the earth elec- trode, which achieves improved combustion characteristics. The spark plugs must be changed every 80 000 km (50 000 miles). 2_04_02 1 – Spark-plug connector with sealing lip 2 – Spark plug 3 – Ignition coil 2_05_02 Surface-gap spark plug 1 – Surface gap 2 – Earth electrode 3 – Centre electrode 4 – Insulator 2002 Service Information 2 - 11