What materials are spark plugs made of?

[StHector]

Spark plugs are made of nickel alloy, platinum, and iridium. Spark plugs are a crucial component of the ignition system in gasoline engines. They introduce high-voltage electricity into the combustion chamber and generate sparks by jumping the electrode gap, thereby igniting the combustible air-fuel mixture in the cylinder. The main types of spark plugs include: Standard spark plugs, extended insulator spark plugs, electrode-type spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs. How spark plugs work: The ground electrode of a spark plug 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 center 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 center electrode, it breaks down the medium between the center electrode and ground electrode to produce a spark, thus igniting the air-fuel mixture in the cylinder.