How are spark plug grades classified?

[MelanieRose]

Currently, spark plugs come in various material grades, each with different performance characteristics and replacement intervals. They can be broadly categorized into: nickel alloy spark plugs, platinum spark plugs, and iridium spark plugs. From a manufacturing process perspective, there are thick electrode spark plugs, needle electrode spark plugs, double platinum spark plugs, iridium-platinum spark plugs, and double needle iridium spark plugs, among others. Additional information: 1. Function of spark plugs: The material of spark plugs usually refers to the electrode material. Currently, platinum and iridium spark plugs are considered the best. Platinum and iridium are precious metals with excellent resistance to high temperatures, high pressure, and corrosion. Using these materials for spark plugs can significantly extend their service life, but they are also more expensive. 2. Replacement intervals for spark plugs: Nickel alloy spark plugs should be replaced every 20,000 to 30,000 kilometers, nickel-yttrium alloy spark plugs every 30,000 kilometers, platinum spark plugs every 40,000 kilometers, double platinum spark plugs every 60,000 kilometers, iridium spark plugs every 80,000 kilometers, and platinum-iridium alloy spark plugs can last up to 100,000 kilometers before needing replacement.

[EmmettRose]

Spark plug grades are primarily classified by heat range. The higher the heat range, the faster the heat dissipation, known as cold-type spark plugs, which are suitable for high-revving engines to avoid overheating. The lower the heat range, the slower the heat dissipation, known as hot-type spark plugs, which are suitable for low-speed daily driving to prevent carbon buildup. As an average car owner with a family vehicle, the recommended heat range is usually indicated in the original owner's manual, such as the numbers in NGK model codes—the larger the number, the colder the plug. Additionally, materials also determine grades: copper plugs are cheaper but require frequent replacement, while iridium plugs are more expensive but can last over 100,000 kilometers and improve fuel efficiency. Remember not to buy different specifications randomly when replacing them, as this may cause unstable ignition or engine damage. For routine maintenance, check the spark plug color—if it's blackened, it might be due to a cold-type plug being too cold and causing carbon buildup. I recommend consulting the manual before replacing to avoid wasting money and shortening the car's lifespan.

[MacLawson]

As a car enthusiast who modifies vehicles, I know the spark plug grade is all about matching the heat range to engine requirements. Different heat ranges affect spark intensity - cold types are used in turbocharged or racing engines for faster heat dissipation to prevent knocking, while hot types are better for city driving to keep carbon deposits clean. I often choose iridium spark plugs for their fine electrodes and powerful ignition that boosts performance. Heat range models like BOSCH FR8SE represent mid-range universal options. During tuning, it's crucial to monitor engine temperature - too low a heat range may cause overheating and melting, while too high makes cold starts difficult. I recommend regularly using a multimeter to check and adjust the gap, ensuring sustained high-performance output.

[LaPeyton]

Beginners can understand spark plug grades by checking the model numbers. The heat range is indicated by numbers or letters, with smaller values like 5 being hot types suitable for slow driving, and larger values like 8 being cold types for fast driving. Copper is a common material but has a short lifespan and needs replacement every year, while platinum lasts longer but is more expensive. Remember not to mix different heat ranges to avoid uneven ignition and increased fuel consumption. Before replacing, check the condition of the old spark plug—excessive carbon buildup or whitening signals a heat range mismatch.