Dinan N20/N54/N55/S55/N63/S63 Iridium Spark Plug - Heat Range 9 - 12mm x 26.5mm x 14mm (HV) - SINGLE

Dinan Iridium Spark Plugs are an excellent upgrade for tuned, and even stock engines, where applicable.* Our spark plugs are made from Iridium - one of the strongest materials available. They last longer than other materials with higher melting points, run cooler, resist preignition, and even require less voltage to produce a strong spark. The iridium electrode with its copper core is harder and stronger than other materials, can dissipate heat more easily, and is better protected from melting, cracking, and other limitations found with standard plugs.

*N54 & N55 COMPATIBILITY: Dinan plugs are numerous steps colder than stock on both the N54 (3 steps colder) and N55 (2 steps colder) and are suggested for tuned, high boost and/or upgraded turbo applications only. They are *NOT* suggested for non-tuned stock vehicles for these speciific applications. If installed on a stock N54/N55 vehicle the plug will not reach its self cleaning temperature and be unable to burn off the combustion deposits leading to fouling, misfires, and a shorter lifespan of the plug.

Dinan spark plugs are great for high boost, high cylinder pressure, high cylinder temperatures, and high-power situations, and they pair nicely with a set of Dinan ignition coils, where applicable. However, they are not only for tuned and higher output vehicles that may benefit from a plug cooler than the factory heat range – they also are applicable to select non-tuned / stock vehicles as well!*

The D640-0002 spark plug applies to the following engines: N20, N54*, N55*, S55, N63/N63TU, & S63/S63TU

Compatible OEM Part #Cross Reference: 12120039664, 12120038896 & 12120038704

Features

• 152% higher melting point than silver, 125% higher than copper, and 38% higher than platinum
• Heat range 9 spark plug (Similar: Bosch 3, Brisk 10, Champion 4, Denso 27, and NGK 9)
• Acceptable for high performance / tuned and most stock* vehicle applications alike
• Optimized electrode design for hard to ignite fuels, such as ethanol
• Cooler operating temperature than stock plugs
• Resists preignition better than stock plugs
• An excellent match for Dinan ignition coils
• 1 step colder than OEM (N20, S55, N63, S63)
• Stronger than copper and platinum
• Lower required supplied voltage
• 3 Steps colder than OEM (N54)
• 2 steps colder than OEM (N55)
• Insulator Material: Ceramic
• Projected insulator design
• Thread diameter: 12mm
• Install Torque: 17 Nm
• Thread reach: 26.5mm
• Hexagon: 14mm Bi-Hex
• Supplied Gap: 0.5mm
• Terminal Type: Nut
• Seat Type: Flat
• Made in the EU

Vehicle Fitment

Please verify exact fitment (engine, submodel, and trim) before purchasing.

Manufacturer Part Number: D640-0002

Images are for illustration purposes only; actual product may vary.

Emissions Note: This product is not CARB approved. It is intended for closed-course competition or off-road use only in California and other CARB states and is not legal for use on pollution-controlled vehicles in those states.

⚠ WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.