{"product_id":"dinan-iridium-spark-plug-heat-range-9-bmw-n20-n54-n55-s55-n63-s63","title":"Dinan Iridium Spark Plug 12x26.5x14mm HV, Heat Range 9 (Single) - BMW N20 \/ N54 \/ N55 \/ S55 \/ N63 \/ S63","description":"\u003cp\u003eTurn up the boost on an N54 or N55 and the factory plugs are usually the first thing to complain. You feel it as a stumble at the top of third gear or a misfire code the morning after a hard pull. The fix starts with getting heat out of the combustion chamber faster.\u003c\/p\u003e\n\u003cp\u003eThe Dinan Iridium Spark Plug with HV terminal fits the BMW N20, N54, N55, S55, N63 and S63 engines. At heat range 9 it runs one step colder than OEM on the N20, S55, N63 and S63, two steps colder on the N55, and three steps colder on the N54. Each engine gets the jump it needs to stay stable under added boost.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eA Colder Iridium Spark Plug for Tuned N54, N55 and S55 Engines\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe center electrode is tipped with iridium over a copper core. Iridium has a 152% higher melting point than silver, 125% higher than copper and 38% higher than platinum, so the tip keeps its shape under high cylinder pressure. The copper core pulls heat away from the tip, and the colder heat range carries it out of the chamber quickly to resist pre-ignition.\u003c\/p\u003e\n\u003cp\u003eRunning a stock N54 or N55? Read this first. Dinan suggests this plug on those two engines for tuned, high-boost or upgraded-turbo cars only. On a non-tuned N54 or N55 it runs too cold and can foul and misfire. On the N20, S55, N63 and S63 it is one step colder than OEM.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIridium Spark Plug Specs and Legal Status\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEach plug ships pre-gapped at 0.5mm with a flat seat, 14mm Bi-Hex and a non-removable nut (HV) terminal, so it drops into the factory location. Before you order, know this: it is not legal for sale or use in the State of California. Sold individually, so order one per cylinder. Dinan part number D640-0002. Sold by AutoTecknic, an authorized Dinan dealer.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's Included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOne Dinan iridium spark plug, 12x26.5x14mm, HV terminal, heat range 9\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeat range 9: 1 step colder than OEM on N20, S55, N63 and S63\u003c\/li\u003e\n  \u003cli\u003e2 steps colder than OEM on N55, 3 steps colder on N54\u003c\/li\u003e\n  \u003cli\u003eIridium center electrode tip with copper core\u003c\/li\u003e\n  \u003cli\u003eIridium: 152% higher melting point than silver, 125% higher than copper, 38% higher than platinum\u003c\/li\u003e\n  \u003cli\u003e12mm thread, 26.5mm reach, 14mm Bi-Hex, flat seat, non-removable nut (HV) terminal\u003c\/li\u003e\n  \u003cli\u003eSupplied gap 0.5mm, install torque 17 Nm\u003c\/li\u003e\n  \u003cli\u003eReplaces OEM 12120039664, 12120038896 and 12120038704\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eVehicle Fitment\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDinan lists this spark plug by engine family:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBMW N20\u003c\/li\u003e\n  \u003cli\u003eBMW N54 (tuned, high-boost or upgraded-turbo applications only)\u003c\/li\u003e\n  \u003cli\u003eBMW N55 (tuned, high-boost or upgraded-turbo applications only)\u003c\/li\u003e\n  \u003cli\u003eBMW S55\u003c\/li\u003e\n  \u003cli\u003eBMW N63 and N63TU\u003c\/li\u003e\n  \u003cli\u003eBMW S63 and S63TU\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot suggested for non-tuned, stock N54 or N55 engines.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePlug swaps are a basic DIY job with a spark plug socket, extension and torque wrench, though the V8 N63 and S63 take more time to reach. The plugs come pre-gapped at 0.5mm, so check the gap but do not open it up. Work on a cold engine.\u003c\/p\u003e\n\u003col\u003e\n  \u003cli\u003eLet the engine cool completely and remove the engine cover.\u003c\/li\u003e\n  \u003cli\u003eUnplug and pull each ignition coil.\u003c\/li\u003e\n  \u003cli\u003eBlow debris out of each plug well, then remove the old plugs.\u003c\/li\u003e\n  \u003cli\u003eThread each Dinan plug in by hand to avoid cross-threading.\u003c\/li\u003e\n  \u003cli\u003eTorque to 17 Nm, then reinstall the coils and engine cover.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Dinan","offers":[{"title":"Default Title","offer_id":51268697129206,"sku":"DNND640-0002","price":18.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2674\/6278\/files\/92805b2c14aced9592dab63338ddddc3L.jpg?v=1784135538","url":"https:\/\/autotecknic.com\/products\/dinan-iridium-spark-plug-heat-range-9-bmw-n20-n54-n55-s55-n63-s63","provider":"AutoTecknic USA","version":"1.0","type":"link"}