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What is the function of a car's spark plug?

1 Answers

McJuniper

07/29/25 12:26pm

Function of car spark plugs: The spark plug's ground electrode is connected to the metal shell, which is threaded into the engine block via the cylinder head. The insulator primarily serves to isolate the metal shell from the central electrode. The terminal nut is the part of the spark plug that contacts the high-voltage coil. When current passes through the terminal nut and the central electrode, it ionizes the medium between the central electrode and the ground electrode to generate a spark, thereby igniting the air-fuel mixture in the cylinder. Components of a spark plug: A spark plug mainly consists of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell. Types of spark plugs: Main types of spark plugs include: standard spark plugs, projected insulator spark plugs, electrode spark plugs, seat spark plugs, pole spark plugs, and surface-gap spark plugs.

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