What is the difference between iridium and platinum spark plugs?
2 Answers
Iridium and platinum spark plugs have the following differences: 1. Melting point: The melting point of iridium material is inherently higher than that of platinum, so under continuous high-temperature operation of the engine, iridium spark plugs can still maintain a stable ignition state, and their discharge performance is also relatively better. However, this does not mean that platinum spark plugs are lacking in this aspect; under normal conditions, they also perform excellently, but iridium spark plugs are more focused on stability. 2. Hardness: Iridium spark plugs are significantly harder than platinum ones, so naturally, iridium spark plugs have better durability. Of course, platinum spark plugs are not inferior either; under normal conditions, their lifespan can generally reach up to 100,000 kilometers, so there is no need to worry too much about this issue.
When it comes to spark plug selection affecting engine ignition efficiency, I often help friends analyze the differences between iridium and platinum plugs. Iridium spark plugs use iridium for the electrode, which is exceptionally hard and fine, capable of withstanding high temperatures and pressures. They produce a thin yet intense spark during ignition, ensuring more complete combustion, thereby enhancing acceleration and fuel economy. However, they come at a higher price, with a single plug costing over a hundred yuan. Platinum spark plugs have larger electrodes coated with a platinum layer, offering superior wear resistance and longer service life, typically needing replacement only after 100,000 kilometers, at a slightly lower cost. However, their ignition performance is slightly weaker, especially in stop-and-go traffic conditions. The material differences also influence their suitability—iridium plugs are ideal for performance-oriented sports cars or turbocharged engines, while platinum plugs are more suited for smooth-driving family cars. It's advisable to choose based on driving habits rather than just opting for the cheaper option, as faulty spark plugs can waste fuel and damage the engine.
