What is the function of a spark plug?
2 Answers
The function of a spark plug is to introduce the high-voltage electricity from the ignition coil into the combustion chamber and use the spark to ignite the air-fuel mixture to complete combustion. What is a spark plug: A spark plug is a crucial component of the ignition system in a gasoline engine. It introduces high-voltage electricity into the combustion chamber and generates a spark by jumping the electrode gap, thereby igniting the combustible air-fuel mixture in the cylinder. What is a spark plug composed of: A spark plug mainly consists of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell. What types of spark plugs are there: The main types of spark plugs include: standard spark plugs, projected insulator spark plugs, electrode spark plugs, seat-type spark plugs, surface-gap spark plugs, and surface-discharge spark plugs. Where is the spark plug located: Spark plugs are installed on the side or top of the engine. In early designs, spark plugs were connected to the distributor via ignition cables. Over the past decade, most car engines have been modified to connect the ignition coil directly to the spark plug.
In a gasoline engine, the spark plug's primary role is to ignite the air-fuel mixture. Simply put, it functions like a tiny light bulb, sparking to ignite the mixture. During engine operation, each cylinder has a spark plug at the top, which receives high-voltage current to create a spark between its electrodes, igniting the gas and causing expansion that drives the piston. If a spark plug fails, the car may experience shaking, difficulty starting, or a significant increase in fuel consumption. Maintaining its condition is crucial—under normal use, it should be inspected every 30,000 to 50,000 kilometers to prevent aging and engine misfires (intermittent ignition failure), which can affect driving smoothness. High-quality spark plugs can improve acceleration response and fuel efficiency, and choosing the right material, such as iridium or platinum versions, greatly benefits vehicle health. Don’t forget regular maintenance to avoid troubles on the road.
