Description
The NGK BKR9EIX Iridium IX Spark Plug is designed for high-performance and modified engines that require reliable ignition under demanding operating conditions. Featuring a fine-wire iridium center electrode and a tapered-cut ground electrode, it promotes consistent spark delivery, improved ignitability, and dependable combustion.
With its colder heat range 9, the BKR9EIX is commonly used in performance applications where increased cylinder temperatures and higher boost pressures require careful spark plug selection. It is particularly popular for tuned and modified engines when specified by the engine builder or tuning specialist.
Key Features
- Fine-Wire Iridium Electrode: Provides reliable spark performance and excellent ignitability.
- Colder Heat Range 9: Suitable for certain high-performance applications requiring increased heat dissipation.
- Consistent Ignition: Helps maintain stable combustion under demanding driving conditions.
- Corrosion-Resistant Plating: Helps protect against corrosion and assists with spark plug removal.
- Performance Applications: Suitable for selected turbocharged, supercharged, and modified engines when the correct plug specification is confirmed.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | NGK |
| Series | Iridium IX |
| Part Number | BKR9EIX |
| NGK Stock Number | 2669 |
| Center Electrode | Fine-wire iridium |
| Heat Range | 9 (cold) |
| Thread Diameter | 14 mm |
| Thread Reach | 19 mm |
| Seat Type | Gasket |
| Resistor | Yes |
| Factory Gap Reference | Approximately 0.032″ (0.8 mm) |
Compatible Engines and Applications
The BKR9EIX is commonly used in selected performance builds and tuned applications, including:
- Audi 3.0T Supercharged EA837 V6 — certain Audi S4, S5, SQ5, A6, A7 and Q5 applications, depending on model year and tuning setup.
- Modified Turbocharged Engines — selected applications where a colder BKR9EIX plug is specifically recommended.
- Custom and Competition Builds — engines requiring this plug’s thread dimensions, electrode design and heat range.
Important Fitment Note: Spark plug compatibility depends on the exact engine, cylinder head, ignition setup and calibration. The BKR9EIX is not a universal replacement for every engine listed above. Verify the required part number and heat range before ordering.
For tuned Audi 3.0T EA837 applications, the recommended spark plug gap may need to be reduced according to boost pressure and the tuner’s specifications. Always confirm the appropriate gap before installation.
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