Set of 4 iridium spark plugs NGK 97506 SILZKBR8D8S for BMW N63 S63 M550I 750Li V8

Set of 4 NGK 97506 SILZKBR8D8S Iridium Spark Plugs for BMW N63 S63 M550I 750Li V8

Professional Solution for Enhanced BMW Engines

The NGK 97506 Iridium Spark Plug Set (marked SILZKBR8D8S) is a specialized set of four premium Laser Iridium series plugs designed for high-performance eight-cylinder BMW engines. These plugs are often chosen by owners of vehicles with N63 and S63 (M-series) engines as a more efficient alternative to standard components. The main technical feature of the 97506 model is that it is "colder" than standard factory plugs. This is critically important for vehicles with software tuning (Stage 1/2) as it allows for effective heat dissipation from the combustion chamber, preventing detonation and pre-ignition.

Laser Iridium Technology and Ignition Reliability

The plug design combines two of the most wear-resistant precious metals. The central electrode is equipped with an iridium tip applied by laser welding, which allowed for the maximum reduction of its diameter. This reduces the required ignition voltage and provides a stable spark even under high boost pressure conditions. The side electrode features a platinum pad that protects it from erosion and ensures the precise inter-electrode gap is maintained throughout its service life. A copper core integrated into the central electrode provides rapid heat dissipation, protecting the engine from overheating under extreme loads.

Protection of Onboard Electronics and Housing Durability

NGK SILZKBR8D8S plugs are equipped with a built-in noise suppression resistor that prevents electromagnetic interference that could disrupt the operation of the car's electronic control units and multimedia systems. The plug housing is treated with a special trivalent metal coating that provides long-term corrosion protection and prevents the thread from seizing to the cylinder head. The high-quality aluminosilicate ceramic insulator has increased dielectric strength, completely eliminating the risk of spark breakdown to the housing.

Detailed Compatibility with BMW Vehicles

These plugs are intended for V8 Biturbo engines and are a mandatory component when increasing the car's power. Below is a detailed compatibility table:

Installation Recommendations

For the correct operation of the ignition system, installation must be carried out using a torque wrench. The tightening torque for this type of thread is 15–25 Nm. Before installation, ensure the spark plug wells are clean. Using a specialized 12-point 14 mm wrench will prevent damage to the plug's edges and ensure proper centering in the well.

• Brand: NGK

• Brand Registration Country: Japan

• Material: iridium, platinum, aluminosilicate ceramic, copper, steel

• Size: thread diameter 12 mm, thread length 26.5 mm, wrench size 14 mm

• Color: white, silver metallic

• Weight: 196 grams (weight of the set of 4 pcs.)

• Condition: new

• Product Group: ignition system spare parts

• Purpose: ignition of the fuel mixture in turbocharged gasoline engines

• Compatibility: BMW engines N63, S63, N20, N55 (for tuning); models M5, M6, X5M, X6M, 550i, 650i, 750i

• Features: "cold" heat range (8), iridium central electrode, platinum insert on the ground electrode, presence of 5 kOhm resistor

• Marking: SILZKBR8D8S

• Article: 97506

• Heat Range: 8

• Thread Pitch: 1.25 mm

• Head Type: Bi-Hex (12-point)

• Inter-electrode Gap: 0.8 mm

• Seal Type: flat gasket

• Package Contents: spark plugs — 4 pcs. in individual and overall packaging

• Barcode (UPC): 087295975060

• OEM Compliance: 12120039664, 12120038896, 12120037580, 12120037582