Engine Electrical System

Spark Plug Description and Operation

~1min read

Description

The spark plug is a device that delivers electric current from the ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed air-fuel mixture by means of an electric spark, while withstanding combustion pressure in the engine. A spark plug has a threaded metal shell electrically insulated from the center electrode by a porcelain insulator.

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A quick Hyundai Elantra AD quiz: every answer comes with an explanation and a link to the manual page.