NGK ILTR6R8G Laser Iridium Spark Plug – Stock No. 91794
The NGK ILTR6R8G is a Laser Iridium spark plug built for stable ignition, long life, and reliable performance in modern petrol engines, including many turbocharged direct-injection setups. It uses a fine iridium centre electrode with a platinum pad on the ground electrode to keep the spark strong and consistent over a long service interval.
- Fine-wire iridium tip for a strong spark under load and at high rpm
- Platinum pad on the ground electrode for long life and consistent gap
- Resistor design to reduce electrical noise that can affect sensors and the radio
- Projected tip for efficient combustion and better cold starts
- Trivalent anti-corrosion coating for easy removal and durability
Use the site’s vehicle lookup or check the Vehicle Fitment tab to confirm this plug suits your engine. It is commonly used in modern petrol engines that specify a 14 mm thread, long reach, taper seat plug.
| Part Number | ILTR6R8G |
| NGK Stock Number | 91794 |
| GTIN | 087295917947 |
| Category | 686 – Spark Plug |
| Type | Laser Iridium (iridium centre, platinum ground pad) |
| Thread Size | M14 x 1.25 |
| Reach (thread length) | 26.5 mm |
| Hex Size | 16 mm |
| Seat Type | Taper seat |
| Heat Range | 6 (NGK scale) |
| Gap | 0.8 mm (pre-set) |
| Resistor | Yes |
| Centre Electrode | Fine-wire iridium |
| Ground Electrode | Nickel with platinum pad |
| Terminal | Solid |
| Recommended Torque (aluminium head) | 15-20 Nm (taper seat, M14) |
Important: Do not force the gap wider on a fine-wire iridium plug. If your ECU or tune needs a different gap, adjust carefully or use the specified part number for your setup.
Installation tips:
– Fit to a cold engine. Hand-thread first to avoid cross-threading.
– Use a torque wrench. Do not over-tighten.
– If re-gapping, use a proper tool and avoid levering on the centre electrode.
The price displayed is for a single plug, please add the desired amount to your basket.


