The NGK Spark Plugs R0409B-8 Iridium Spark Plug is designed to deliver reliable ignition, consistent performance, and extended service life for high-performance applications. Manufactured by NGK Spark Plugs, this spark plug features an ultra-fine iridium center electrode that requires less voltage to produce a strong spark. Its compact electrode design helps promote efficient combustion and supports dependable engine operation.
Compared with a platinum electrode, the iridium electrode is approximately 25% smaller, while measuring about one-quarter the size of a conventional nickel electrode. This reduced diameter helps lower the ignition system’s voltage demand, which can reduce electrical strain and contribute to longer ignition component life. The R0409B-8 design is intended for compatible racing, performance, and specialty engine applications; verify vehicle, engine, and heat-range fitment before installation.
NGK Spark Plugs also enhances this plug with a metal shell plating formulated for improved resistance to corrosion. The result is a durable spark plug built for demanding operating conditions and long-term reliability. This product is identified by manufacturer part number 7791 and vendor part number 7791. Always follow the engine manufacturer’s installation procedure, torque specifications, and application requirements for proper fitment and performance.
Features:
- Brand: NGK Spark Plugs
- Model: R0409B-8
- Manufacturer part number: 7791
- Vendor part number: 7791
- Electrode material: Iridium
- Electrode design: Ultra-small diameter center electrode reduces voltage requirements
- Ignition performance: Supports reliable spark delivery and efficient combustion
- Service life: Reduced voltage demand helps extend ignition system life
- Corrosion resistance: Enhanced metal shell plating helps protect against corrosion
- Fitment: Designed for compatible performance, racing, and specialty engine applications; verify application-specific fitment before installation