What is the grade of spark plugs?
2 Answers
Spark plugs are mainly categorized into the following types: Standard spark plugs, extended tip spark plugs, electrode spark plugs, seat spark plugs, pole spark plugs, and surface gap spark plugs. Location of spark plugs: Spark plugs are installed on the side or top of the engine. In earlier models, spark plugs were connected to the distributor via ignition cables. However, over the past decade, most car engines have been updated to use ignition coils that connect directly to the spark plugs. Steps to replace spark plugs: Open the hood and remove the plastic cover of the engine. Disconnect the high-voltage ignition wires, marking each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. During removal, check for any external debris such as leaves or dust, and ensure everything is cleaned thoroughly. Place the new spark plugs into the spark plug holes, hand-tightening them a few turns before using the socket to tighten further. Reinstall the high-voltage ignition wires according to the firing order, then reattach the cover.
When it comes to spark plug grades, I know them inside out! It's mainly determined by heat range and material. Heat range refers to heat dissipation capability, categorized as cold type, medium type, and hot type - the higher the number, the better the heat dissipation. Regular sedans typically use heat range 5-7, while performance cars require cold types with 9 or above to withstand high RPMs. Materials are divided into three grades: nickel alloy, platinum, and iridium. Nickel alloy is the cheapest but needs replacement every 20,000-30,000 km, platinum lasts about 50,000 km, and iridium is the top-tier that can endure up to 100,000 km. Never choose spark plugs based solely on material - incorrect heat range can still damage your engine. A friend of mine once replaced his spark plugs carelessly, using ones with too high heat range which caused ignition failure, costing nearly a thousand yuan in repairs.
