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!*
Always check sizes, gap, and heat range specs before installing. Installation of the wrong length plug can cause damage to the engine. You must verify this before installing the plug.
The D640-0002 spark plug applies to the following engines: N20, N54*, N55*, S55, N63/N63TU, & S63/S63TU
Dinan N20/N54/N55/S55/N63/S63 Iridium Spark Plug - Heat Range 9 - 12mm x 26.5mm x 14mm (HV) - SINGLE
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
Compatible OEM Part #Cross Reference: 12120039664, 12120038896 & 12120038704
Optimized electrode design for hard to ignite fuels, such as ethanol
Dinan Iridium Spark Plug - 12x26.5x14MM (HV) - Heat Range 9
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)
N20/N54/N55/S55/N63/N63TU/S63/S63TU
SPARK PLUGS HV N20N54N55S55N63S63
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
Iridium Spark Plug
Terminal Type: Nut
Seat Type: Flat
Made in the EU
DIN SP
