How Many Types of Spark Plugs Are There for Cars?

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Automotive spark plugs can be categorized into several types: 1. By material: nickel alloy spark plugs, platinum spark plugs, and iridium spark plugs; 2. By shape: standard spark plugs, electrode spark plugs, extended insulator spark plugs, seat-type spark plugs, and surface-gap spark plugs; 3. By heat range: cold-type spark plugs and hot-type spark plugs. Commonly known as spark plugs or "fire nozzles," their function is to discharge the high-voltage pulse electricity delivered by the high-voltage wire, ionize the air between the two electrodes of the spark plug, and generate an electric spark to ignite the air-fuel mixture in the cylinder. They mainly consist of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell, with the side electrode welded to the shell.