Spark plugs

The spark plug is comprised of a metal core which is housed in a ceramic insulator. This, in turn, is surrounded by a metal casing which has a thread that is screwed into the cylinder head.

When considering the basic construction of the spark plug, there have been no profound changes over the past 50 years. Like before, the spark plug is comprised of a metal core which is housed in a ceramic insulator. This, in turn, is surrounded by a metal casing which has a thread that is screwed into the cylinder head and normally has a hexagonal section on the top which fits the spark plug socket and enables the installation and removal of spark plugs with a spark plug spanner.

The main purpose of the construction lies in ensuring that the electrical circuit at high voltage on the spark plug is closed with a spark, which jumps from the middle electrode to the earth electrode.

Related topics

Requirements: A spark plug must fulfill very specific requirements in order to do its job reliably.

Spark plug technologies: NGK produces spark plug technologies for every application - regardless of whether it is for normal road traffic, racing or for gas-powered engines.

E-Learning: Take advantage of the know-how of our experts on the NGK E-Learning platform. There you will find detailed knowledge in multimedia formats, such as 3D animations, videos and diagrams.

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