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Precision Iridium Ignition for High-Compression and Turbocharged Engines
The NGK IFR7F-8DS is an OEM-grade Laser Iridium spark plug engineered for engines demanding precise ignition timing, consistent spark kernel placement, and long service intervals. With a 0.8 mm iridium center electrode and a platinum-tipped ground electrode, NGK5794 delivers a focused, reliable spark under high boost pressures and extreme combustion temperatures. Each box contains four plugs for a single-bank installation.
Key Features
- Laser-welded 0.8 mm iridium center electrode for pinpoint spark accuracy
- Platinum-tipped ground electrode resists erosion and extends service life
- Trivalent metal plating on shell resists corrosion and eases installation torque
- Corrugated ribs on the insulator prevent flashover and misfires
- Copper core improves heat dissipation and thermal range consistency
- Factory pre-gapped to OEM specification, no adjustment required
- Box of 4 plugs covers one cylinder bank on most 4-cylinder applications
Specifications
| Detail | Value |
|---|---|
| Part Number (MPN) | IFR7F-8DS / NGK5794 |
| Plug Type | Laser Iridium |
| Center Electrode | Iridium, 0.8 mm |
| Ground Electrode | Platinum-tipped |
| Thread Size | 14 mm |
| Reach | 26.5 mm |
| Hex Size | 16 mm |
| Gap | 0.8 mm (pre-set) |
| Heat Range | 7 |
| Resistor | Yes |
| Quantity | 4 plugs per box |
| UPC | 087295870669 |
What's Included
- 4x NGK IFR7F-8DS Laser Iridium Spark Plugs
About NGK
NGK Spark Plugs has been manufacturing ignition components since 1936 and supplies OEM spark plugs to nearly every major automaker worldwide. Their Laser Iridium line is produced under strict tolerances with laser-welded fine-wire electrodes, delivering consistent ignition performance over extended drain intervals without gapping or adjustment.
Frequently Asked Questions
What vehicles use the NGK IFR7F-8DS spark plug?The IFR7F-8DS fits a wide range of high-compression and turbocharged 4-cylinder engines. Cross-reference your vehicle's OEM plug number or consult an NGK fitment guide with your year, make, model, and engine displacement to confirm compatibility before ordering NGK5794.
Does the NGK IFR7F-8DS come pre-gapped?Yes. Each NGK5794 plug ships pre-gapped from the factory. Do not regap iridium plugs as adjusting the fine-wire electrode can crack the tip and destroy the plug. Install straight from the box.
How long do NGK Laser Iridium spark plugs last?Under normal operating conditions and with clean fuel, NGK Laser Iridium plugs are rated for up to 100,000 miles. Actual service life varies with fuel quality, oil consumption, and engine tune.
Can I use the IFR7F-8DS in a turbocharged or supercharged engine?Yes. The 7 heat range designation and iridium construction make the NGK IFR7F-8DS well suited for forced-induction applications. Always verify your tuner's recommended heat range for modified engines running elevated boost.
What is the torque spec for installing the NGK IFR7F-8DS?For a 14 mm plug in an aluminum head, torque to 18 ft-lb (24 Nm) with a new gasket. On a used gasket in a re-installation, reduce torque by approximately 30%. Always follow your engine manufacturer's specification.
Is the NGK IFR7F-8DS equivalent to any OEM plug numbers?NGK plugs are frequently used as OEM replacements across many brands. Cross-reference the IFR7F-8DS against your current plug number using NGK's official catalog or part cross-reference tool at ngksparkplugs.com.
How many plugs do I need for a 4-cylinder vs. 6-cylinder engine?A 4-cylinder engine requires 4 plugs, so one box of NGK5794 covers a complete change on a standard 4-cylinder. A 6-cylinder requires 6 plugs and a V8 requires 8 plugs, so order accordingly.
What is the difference between iridium and standard copper spark plugs?Iridium plugs use a fine-wire center electrode that requires less voltage to fire, producing a more consistent spark. They last significantly longer than copper plugs and maintain their gap more precisely, which is critical in high-performance and modern direct-injection engines.
Installation Instructions
- Allow the engine to cool completely before removing spark plugs to prevent thread damage to aluminum heads.
- Disconnect the ignition coil or spark plug wire from the plug you are replacing.
- Use a spark plug socket with a rubber insert to remove the old plug by turning counterclockwise.
- Inspect the plug bore and clean any debris before installation.
- Hand-thread each NGK IFR7F-8DS into the cylinder head until snug, then torque to spec.
- Reconnect the ignition coil or plug wire and repeat for all cylinders.
- Start the engine and verify smooth idle with no misfire codes.
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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