Dinan Iridium Spark Plug - 12x26.5x14MM (Flat) - Heat Range 9 D640-0001

Order link:

https://x-ph.com/dinan-iridium-spark-plug-12x26-5x14mm-flat-heat-range-9-d640-0001/?showHidden=true

Upgrade your ignition system with the Dinan Iridium Spark Plug, engineered for high-performance and tuned engines, yet fully compatible with stock applications. Designed with a heat range of 9, this spark plug is ideal for engines running higher boost pressures, increased cylinder temps, and high horsepower levels. Featuring a durable iridium construction with a copper core, it offers superior resistance to pre-ignition, higher thermal conductivity, and a longer service life than standard copper or platinum plugs.

With a flat seat, 12mm thread diameter, and 26.5mm thread reach, this precision spark plug ensures reliable combustion under the most demanding conditions. Its projected insulator and optimized electrode geometry improve ignition efficiency and enhance performance with hard-to-ignite fuels like ethanol or E85. Dinan spark plugs require less voltage to produce a stronger spark and operate at cooler temperatures—making them an ideal match for both stock engines and high-output builds.

Perfect for BMW Gen 1 B48, Gen 1 & 2 B58, and S58 engines, this plug is also an excellent pairing with Dinan Ignition Coils for maximum ignition performance.

Key Features:

• Heat Range 9 – Ideal for high-performance and forced induction engines

• Iridium with copper core – Stronger than platinum and copper, cooler operation

• Projected insulator design for enhanced ignition efficiency

• Lower voltage requirement and resistance to pre-ignition

• OEM-Compatible Cross References: 12120040551, 12122455258, 12120046646, 12125A4EF60

• Thread Size: 12mm x 26.5mm | Hex Size: 14mm Bi-Hex

• Seat Type: Flat | Gap: 0.5mm | Torque Spec: 17 Nm

• One step colder than stock for Gen 1 B48, Gen 1/2 B58, and S58 engines

• Made in the EU

Note: Always verify fitment, reach, and heat range before installation. Installing the incorrect spark plug can cause engine damage.

Dinan Iridium Spark Plug - 12x26.5x14MM (HV) - Heat Range 9 D640-0002

Order link:

https://x-ph.com/dinan-iridium-spark-plug-12x26-5x14mm-hv-heat-range-9-d640-0002/?showHidden=true

Enhance the performance and reliability of your BMW engine with the Dinan Iridium Spark Plug, designed for high-performance and high-boost applications. Featuring a heat range 9 specification, this spark plug is constructed with a durable iridium alloy electrode and a copper core to ensure superior thermal conductivity, resistance to pre-ignition, and long-term durability.

With a 12mm thread diameter, 26.5mm thread reach, 14mm bi-hex nut, and flat seat design, this plug is tailored for demanding engine environments. The HV (high voltage/nut terminal) type ensures a secure connection to ignition systems and is an excellent pairing with Dinan ignition coils. This plug is ideal for tuned or modified engines, including BMW's N54, N55, N20, S55, N63/N63TU, and S63/S63TU platforms.

Important Compatibility Note: This plug is 3 steps colder than OEM for N54 engines and 2 steps colder for N55. It is recommended only for tuned or high-boost configurations. Use on stock N54 or N55 engines may result in plug fouling, misfires, and reduced performance due to the inability to reach self-cleaning temperature.

Key Features:

• Heat range 9 for optimized performance in high-temperature, high-pressure conditions

• Iridium electrode with copper core for enhanced durability and spark consistency

• HV terminal (nut style) for high-voltage coil compatibility

• Flat seat, 12mm x 26.5mm thread, 14mm bi-hex nut configuration

• Compatible with ethanol-based fuels (E85 safe)

• Lower voltage requirement with cooler operation than stock plugs

• Projected insulator design for efficient combustion

• Excellent match with Dinan ignition coils

• OEM Cross References: 12120039664, 12120038896, 12120038704

• Manufactured in the EU

Vehicle-Specific Heat Range Details:

• 3 steps colder than OEM for N54 engines

• 2 steps colder than OEM for N55 engines

• 1 step colder than OEM for N20, S55, N63, and S63 engines