| VELOSTER(FS) >2013 > G 1.6 T-GDI > Engine Electrical System > Ignition System > Spark Plug>Description and Operation |

Description
A spark plug is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture therein by means of an electric spark, while containing combustion pressure within the engine. A spark plug has a metal threaded shell, electrically isolated from a central electrode by a porcelain insulator.