NGK Iridium IX BPR8EIX Spark Plug | Heat Range 8
6684
Pairs well with
NGK Iridium IX Spark Plug | BPR8EIX 6684
Improve ignition reliability and spark performance with the NGK Iridium IX BPR8EIX Spark Plug. Designed for performance enthusiasts, this heat range 8 spark plug features a fine-wire iridium center electrode for consistent ignition, excellent durability, and reliable operation in compatible high-performance engines.
The Iridium IX design uses a 0.6mm iridium center electrode to concentrate spark energy and improve ignitability. Combined with a tapered-cut ground electrode, this design helps promote consistent combustion, smooth idling, and responsive throttle performance.
NGK's trivalent metal shell plating provides corrosion resistance, while the copper-core electrode helps transfer heat away from the firing tip. These features make the BPR8EIX a popular choice for performance applications requiring its specific heat range, dimensions, and ignition characteristics.
Key Features
- NGK Iridium IX performance spark plug
- Fine-wire 0.6mm iridium center electrode
- NGK heat range 8
- Tapered-cut ground electrode for improved ignitability
- Copper-core construction for effective heat transfer
- Trivalent metal plating for corrosion resistance
- Designed for consistent spark performance and durability
- Resistor design helps reduce electrical interference
- NGK stock number 6684
- NGK part number BPR8EIX
Technical Specifications
- Manufacturer: NGK
- Series: Iridium IX
- Part Number: BPR8EIX
- Stock Number: 6684
- Heat Range: 8
- Thread Diameter: 14mm
- Thread Pitch: 1.25mm
- Thread Reach: 19mm (0.750 inch)
- Hex Size: 21mm (13/16 inch)
- Seat Type: Gasket
- Center Electrode: Iridium
- Ground Electrode: Nickel
- Center Electrode Diameter: 0.6mm
- Preset Gap: 0.8mm (0.032 inch)
- Resistor: 5,000 Ohms
- Terminal Type: Removable Nut
Performance Benefits
- Fine-wire iridium electrode supports reliable ignition
- Excellent resistance to electrode wear
- Helps maintain consistent combustion under demanding conditions
- Designed for performance-oriented engines
- Corrosion-resistant shell coating for long-term durability
Vehicle Fitment & Compatibility
The NGK BPR8EIX is designed for engines requiring its specific thread dimensions, heat range, reach, and electrode configuration. It may also serve as an iridium alternative to the NGK BPR8ES (3923) when approved for the application.
Always verify compatibility using the vehicle manufacturer's recommendations or NGK's application guide. Modified engines may require different spark plug heat ranges or electrode gaps depending on their ignition system, fuel type, and operating conditions.
Important Installation Notes
- Confirm spark plug compatibility before installation
- Verify the required electrode gap for your application
- Use the correct torque specification for your cylinder head
- Install using an appropriate spark plug socket
- Do not overtighten or damage the fine-wire iridium electrode
- Professional installation is recommended when modifying ignition specifications
What's Included
- One NGK Iridium IX BPR8EIX Spark Plug (6684)
Why Buy NGK from JD Customs USA?
JD Customs USA offers genuine NGK ignition components for enthusiasts who demand reliable performance from their engines. Whether maintaining a street car, servicing a modified engine, or preparing a vehicle for motorsport use, choosing the correct spark plug is essential for consistent ignition performance.
Our team understands the importance of spark plug heat ranges, electrode gaps, and engine compatibility. We provide clear product specifications and knowledgeable customer support to help enthusiasts select the appropriate NGK ignition components for their builds.
- Genuine NGK ignition products
- Accurate manufacturer part numbers and specifications
- Support for modified and high-performance engines
- Knowledgeable automotive enthusiast customer service
- Secure ordering from an established performance parts retailer
