Precision Ignition for Demanding Performance Engines
This dual precious metal spark plug pairs a fine wire iridium center electrode with a platinum ground pad, giving performance engines a stronger, more consistent spark across a wide range of operating conditions. The design targets reduced misfires and smoother throttle response for vehicles that call for a fine gap, high heat range plug.
Key Features
- Fine wire iridium center electrode for a stronger, more focused spark
- Platinum pad on the ground electrode resists erosion and extends service life
- Laser welded electrode tips for long term durability under high combustion temperatures
- Resistor design suppresses radio and electronic interference
- Precision engineered gap for consistent ignition across the rev range
Specifications
| Detail | Value |
|---|---|
| Gap | 1.1mm |
| Heat Range | 5 |
| Thread Size | M14 x 1.25 |
| Reach | 26.5mm |
| Hex Size | 5/8 in (16mm) |
| Resistor | Yes |
What’s Included
- 4 NGK DILFR5A11 iridium/platinum spark plugs
About NGK
NGK is a global leader in ignition technology, supplying precious metal spark plugs to major vehicle manufacturers as original equipment for decades. Its combination of iridium and platinum materials is engineered to extend service life while maintaining a stable spark under demanding conditions.
Related Parts
- NGK Iridium Spark Plug Box of 4 (DILKAR7B11)
- NGK Double Platinum Spark Plug Box of 4 (PFR7S8EG)
- NGK Iridium IX Spark Plug Box of 4 (DVPR9EIX)
FAQ
What is the NGK DILFR5A11?
The NGK DILFR5A11 is a dual precious metal spark plug combining a fine wire iridium center electrode with a platinum tipped ground electrode. It is designed for engines requiring a heat range 5 plug with a 1.1mm gap and M14 x 1.25 thread.
How is this different from a standard iridium plug?
This plug uses platinum on the ground electrode in addition to iridium on the center electrode, which can offer additional wear resistance compared to an iridium only design.
What gap does this spark plug use?
This plug uses a 1.1mm gap, which is wider than many fine wire iridium plugs and suited to specific engine applications.
What thread and reach does this plug use?
It uses an M14 x 1.25 thread with a 26.5mm reach and 5/8 inch hex size.
Does this spark plug include a resistor?
Yes, this plug includes an internal resistor to help suppress radio and electronic interference.
How many plugs come in this box?
This listing includes a box of 4 spark plugs.
How long do iridium/platinum plugs typically last?
Precious metal plugs generally last longer than standard nickel plugs due to the wear resistance of iridium and platinum, though exact service life depends on the vehicle and driving conditions.
Install Instructions
- Allow the engine to cool completely before starting work
- Remove the ignition coil, coil pack, or spark plug wire
- Use a spark plug socket to remove the old plug, turning counterclockwise
- Verify the gap on the new plug matches manufacturer specification
- Thread the new plug in by hand until seated, then torque to specification
- Reconnect the coil, coil pack, or wire before starting the engine
