Bosch 7909 Spark Plug

Overview of Bosch Nickel Spark Plug 7909

The Bosch Nickel Spark Plug 7909 is engineered for reliable ignition performance in select BMW models. Designed with precision attributes, this spark plug supports efficient combustion and consistent engine operation for vehicles like the BMW 325i and 535i.

• Resistance: 6000 ohms for noise suppression
• Ground Electrode Tip Design: Tapered v-profile for optimized spark
• Pre-Gap Size: 0.8 mm for precise ignition timing
• Center Electrode Core Material: Nickel-yttrium and copper for durability
• Insulator Material: Ceramic with projected insulator type
• Thread Diameter: 14 mm with 19 mm reach
• Seat Type: Flat for secure fitment
• Manufacturer Heat Range: 8 suitable for moderate engine temperatures

Detailed Product Description

The Bosch Nickel Spark Plug 7909 features a single ground electrode with a tapered v-profile tip made of nickel, enhancing spark efficiency and combustion stability. The center electrode combines nickel-yttrium and copper materials, providing a balance of conductivity and wear resistance. Its ceramic insulator with a projected design improves voltage insulation and heat dissipation. The spark plug’s 14 mm thread diameter and 19 mm reach ensure compatibility with specific BMW engines, while the flat seat type guarantees a proper seal within the combustion chamber. The integrated 6000 ohm resistor helps reduce electromagnetic interference, supporting vehicle electronics.

Compatible BMW Models and Applications

This spark plug is compatible with a range of BMW vehicles, including the 325e, 325es, 325i, 325is, 325iX, 525i, 528e, 533i, 535i, 535is, 635CSi, 735i, and 735iL. It is designed specifically for 4-cycle engines, making it suitable for these models’ ignition systems.

• Improves ignition reliability in BMW 325i and 535i engines
• Reduces misfires and rough idling
• Helps maintain fuel efficiency and engine performance
• Supports stable combustion under varied driving conditions
• Minimizes electromagnetic interference affecting vehicle electronics

Installation Notes and Tips

When installing the Bosch Nickel Spark Plug 7909, ensure the pre-gap size of 0.8 mm is maintained for optimal ignition. Use a torque wrench to tighten the spark plug to manufacturer specifications to avoid damage to the flat seat and ensure a proper seal. Inspect the spark plug threads and combustion chamber for cleanliness before installation. This spark plug is designed for standard ground configuration and requires no modification for fitment in compatible BMW models.

Quality Assurance and Warranty

Bosch manufactures the Nickel Spark Plug 7909 to meet strict quality standards, using durable materials such as nickel-yttrium and copper for the electrodes and ceramic for the insulator. The integrated resistor complies with OEM requirements to reduce electrical noise. While specific warranty details are not provided here, Bosch products typically come with manufacturer-backed quality assurance to support reliable performance in secondary ignition systems.

About the Bosch Nickel Product Line

The Bosch Nickel product line focuses on spark plugs that utilize nickel-based electrode materials, offering a balance of durability and conductivity. This line is designed to provide consistent ignition performance in a variety of vehicles, including the BMW models listed. The Nickel series spark plugs are engineered to meet OEM specifications, ensuring compatibility and reliable operation within secondary ignition systems.