What are automotive spark plugs?

A spark plug is a key component in a gasoline engine's ignition system. It is a device designed to be installed in each cylinder of a gasoline-powered internal combustion engine to generate an electric spark to ignite the air-fuel mixture. Its primary function is to generate an electric spark under the action of high voltage electricity, igniting the combustible mixture within the engine cylinder. A spark plug typically consists of a center electrode, a ground electrode, an insulator, and a metal housing. It operates under harsh conditions of high temperature and pressure.

Depending on the design and material, spark plugs can be categorized into various types, including ordinary copper core spark plugs, platinum spark plugs, and iridium spark plugs. Iridium spark plugs are the most widely used in modern high-performance engines due to their excellent durability and ignition performance. Spark plug performance directly affects engine starting performance, fuel economy, and emissions. Regular inspection and replacement of spark plugs is an essential part of vehicle maintenance.

Generally speaking, the replacement interval for ordinary spark plugs is 30,000-50,000 kilometers, while platinum or iridium spark plugs have a service life of up to 80,000-100,000 kilometers. When selecting spark plugs, it's important to consider whether parameters such as calorific value and gap match the engine. Improper spark plug use can lead to engine detonation, reduced power, or increased fuel consumption. With advancements in engine technology, spark plugs are also developing towards longer service life, stronger resistance to carbon deposits, and more stable ignition performance.