What is the function of a car's spark plug?
2 Answers
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.
Spark plugs play a crucial role in a car's engine by igniting the fuel, much like a miniature lighter specifically designed to generate electrical sparks within the cylinders to ignite the air-fuel mixture, enabling the engine to function properly and drive piston movement. With over 20 years of driving experience, I've deeply understood the troubles caused by faulty spark plugs—difficulty starting the car, sluggish acceleration, increased fuel consumption, and once even a near-stall on the highway that left me in a cold sweat. Regular replacement is essential; generally, they should be inspected every 20,000 to 30,000 kilometers, with carbon buildup on the electrodes requiring cleaning or replacement. Neglecting them not only reduces power but also leads to soaring fuel consumption, worsened emissions, and compromised driving safety. During routine maintenance, I always remind myself not to skimp on this small expense—a reliable ignition system is the foundation of worry-free driving. Choosing the right model is also critical, as different engines require spark plugs with matching heat ranges to achieve optimal efficiency.
