What is the Function and Purpose of Spark Plugs?
2 Answers
Spark plugs play a crucial role in the ignition system of an internal combustion engine. The ground electrode of a spark plug is connected to the metal shell, which is in turn 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 comes into contact with 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, creating a spark that ignites the air-fuel mixture in the combustion chamber. Spark Plug Replacement Intervals: Under normal maintenance conditions, spark plugs should be replaced every 40,000 to 60,000 kilometers. However, this can vary depending on the brand and engine type, so it's advisable to follow the manufacturer's manual. Here are some general guidelines for replacement: Platinum spark plugs should be replaced at 40,000 kilometers, standard nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs between 60,000 to 80,000 kilometers.
As a driver with over twenty years of experience, spark plugs in the engine are like lighters, specifically responsible for igniting the gasoline to explode and push the pistons into action. The car relies on them for both starting and driving; if the spark plugs are old or malfunctioning, the engine will start to sputter, struggle to start, jerk during acceleration, and fuel consumption will skyrocket. I remember once on the highway when my car was shaking violently—after taking it in for repairs, it turned out the spark plug gap was too wide and had carbon buildup. After cleaning it, everything ran smoothly again. So don’t neglect regular maintenance; I recommend checking the condition of the spark plug electrodes every 50,000 kilometers to keep them clean and unobstructed. Different car models require matching spark plugs—for example, SUVs should use long-life types to extend engine life and avoid the hassle of breaking down mid-journey. This way, driving daily is both safe and worry-free, without wasting money unnecessarily.
