What Materials Are Included in Spark Plugs?
2 Answers
Spark plug materials are generally classified into nickel alloy spark plugs, platinum spark plugs, iridium-platinum spark plugs, and iridium spark plugs. Among these materials, iridium-platinum spark plugs and iridium spark plugs are considered outstanding. Nickel Alloy Spark Plugs Nickel alloy spark plugs are the most common type and are not suitable for high-end vehicles, being only applicable to mid-to-low-end models. Their lifespan is approximately 20,000 kilometers. Platinum Spark Plugs Platinum spark plugs are characterized by their long lifespan, durability, and stable flame, making them suitable for more extreme working conditions. Their lifespan is approximately 40,000 kilometers. Iridium-Platinum Spark Plugs Iridium-platinum spark plugs use iridium for the central electrode, enhancing ignition performance and improving the sensitivity of engine ignition, while the side electrode is made of platinum. The lifespan of iridium-platinum spark plugs ranges from 60,000 to 100,000 kilometers. Iridium Spark Plugs Iridium material boasts high strength, corrosion resistance, and a high melting point, making iridium spark plugs the best in performance. Iridium is the most corrosion-resistant and wear-resistant precious metal, meeting the demands of high-power engines and withstanding high-temperature environments, ensuring the electrodes do not melt or degrade. Correspondingly, their price is also higher, ranging from tens to hundreds of yuan. Iridium spark plugs can be replaced every 60,000 to 80,000 kilometers.
I'm the type who enjoys tinkering with cars, and I've given some thought to spark plug materials. Typically, the center electrode and ground electrode of a spark plug are made from different metals. For example, copper-core plugs are cheap but prone to oxidation, nickel alloy is more common and practical, platinum is more durable and suitable for high mileage, while iridium is the top-tier option—offering fast ignition and long lifespan. The insulator is usually ceramic, which prevents electric shock and withstands high temperatures; the shell is often made of steel or aluminum to ensure durability. Material choice makes a big difference—iridium spark plugs provide stable ignition, quicker engine response, and lower fuel consumption, especially ideal for turbocharged cars. During routine maintenance, don't skimp on quality—choosing the right one can extend engine life and reduce emissions. I recommend checking spark plug condition every two years or 30,000 kilometers, replacing them if worn to ensure safe and smooth driving.
