Set of 8 iridium spark plugs NGK 97506 SILZKBR8D8S for BMW N63 S63 M550I 750Li V8

8pcs Iridium Spark Plugs Set NGK 97506 SILZKBR8D8S for BMW N63 S63 M550I 750Li V8

High Performance for V8 Biturbo Engines

The set of 8 iridium spark plugs NGK 97506 (SILZKBR8D8S) is the ideal solution for BMW's flagship eight-cylinder engines of the N63 and S63 series. The Laser Iridium line is specifically designed for high-performance turbocharged engines. The main advantage of these spark plugs lies in their "cold" heat range (8), which allows for efficient dissipation of excess heat from the combustion chamber. This is critical for preventing detonation and ensuring stable engine operation at high RPMs, especially in vehicles with Stage 1 or Stage 2 chip tuning.

Laser Iridium Technology and Platinum Inlay

The spark plugs feature a center electrode with an iridium tip applied using laser welding technology. Iridium is one of the world's hardest precious metals, allowing for an extremely thin electrode. This reduces the required ignition voltage and guarantees a powerful spark even under extreme boost pressure. The ground electrode features a platinum inlay, which minimizes electrical erosion and ensures the maintenance of a precise spark gap (0.8 mm) throughout the entire service life.

Reliability and Electronic Protection

The housing of each spark plug is treated with a trivalent zinc coating, providing superior corrosion protection and preventing the thread from seizing to the cylinder head. A copper core, occupying 98% of the center electrode's volume, ensures rapid heat dissipation. The integrated 5 kOhm resistor protects sensitive electronic engine management and multimedia systems from electromagnetic interference. The use of a high-quality alumina silicate ceramic insulator eliminates the risk of spark flashover to the housing.

Detailed Compatibility with BMW Vehicles

NGK 97506 spark plugs are the factory standard or recommended upgrade for the following models:

Technical Specifications

• Brand: NGK

• Brand Registration Country: Japan

• Material: Iridium, Platinum, Alumina Silicate Ceramic, Copper, Steel

• Size: Thread Diameter 12 mm, Thread Length 26.5 mm, Hex Size 14 mm

• Color: White, Silver Metallic

• Weight: 392 grams

• Gender: Unisex

• Condition: New

• Product Group: Ignition System Spare Parts

• Purpose: Fuel ignition in high-load V8 engines

• Compatibility: BMW N20, N55, S55, N63, S63 engines; M5, M6, M550i, 750i, X5M, X6M models

• Features: High Ignitability, "Cold" heat range, Laser welded electrodes

• Marking: SILZKBR8D8S

• Stock Number: 97506

• Heat Range: 8

• Thread Pitch: 1.25 mm

• Socket Type: Bi-Hex (12-point)

• Spark Gap: 0.8 mm

• Resistor Value: 5 kOhm

• Seat Type: Flat with gasket

• Package Contents: Iridium spark plugs — 8 pieces

• Barcode (UPC): 087295975060

• OEM Compatibility: 12120039664, 12120038896, 12120037580, 12120037582

• Recommended Tightening Torque: 15–25 Nm