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V-Groove Copper Spark Plugs Built for Consistent Firing in High-Compression Engines
The NGK XR5 is a V-Power copper spark plug designed for engines requiring a racing-style electrode geometry at heat range 5 without the elevated cost of precious-metal construction. The V-groove on the ground electrode of NGK3332 concentrates the spark arc at a defined contact point, reducing voltage demand at the coil and producing a stable, reproducible ignition event across all engine speeds. Each box contains four plugs for a complete single-bank service.
Key Features
- V-groove ground electrode focuses spark at a fixed point for reliable ignition
- Copper core center electrode provides excellent heat transfer and thermal stability
- Racing-inspired electrode geometry adapted for street and performance applications
- Ribbed insulator prevents voltage flashover under high-demand conditions
- Resistor type reduces electromagnetic interference with onboard electronics
- Triple-seal construction prevents combustion gas leakage past the plug shell
- Box of 4 covers a complete replacement on most 4-cylinder engines
Specifications
| Detail | Value |
|---|---|
| Part Number (MPN) | XR5 / NGK3332 |
| Plug Type | V-Power Copper |
| Electrode Design | V-groove ground electrode |
| Core Material | Copper |
| Heat Range | 5 |
| Resistor | Yes |
| Quantity | 4 plugs per box |
| UPC | 087295833296 |
What's Included
- 4x NGK XR5 V-Power Spark Plugs
About NGK
NGK Spark Plugs has produced ignition components for OEM and aftermarket use since 1936. As the world's leading spark plug manufacturer, NGK supplies plugs to nearly every major automaker under strict quality control. Their V-Power series uses a patented V-groove ground electrode to improve spark focus and reduce required firing voltage without requiring iridium or platinum electrode materials.
Frequently Asked Questions
What vehicles use the NGK XR5 spark plug?The XR5 fits a range of import and domestic vehicles requiring a heat range 5 copper plug. Verify fitment by cross-referencing your OEM plug number against NGK3332 using the NGK fitment guide with your year, make, model, and engine code before ordering.
What is the V-groove ground electrode on the NGK XR5?The V-groove is a precision-machined notch in the ground electrode face. It focuses the spark discharge to a specific contact point, reducing the firing voltage required from the ignition coil, improving spark consistency, and supporting more complete combustion compared to standard flat-face designs.
Does the NGK XR5 need to be gapped before installation?The NGK3332 ships from the factory with a preset gap. Verify the gap using a wire feeler gauge against your vehicle's specification before installing. Adjust carefully on copper plugs using a gapping tool, unlike iridium plugs which must never be regapped.
How often should NGK V-Power copper spark plugs be replaced?NGK copper V-Power plugs are rated for approximately 20,000 to 30,000 miles under normal conditions. Check your vehicle manufacturer's maintenance schedule and inspect plugs more frequently if the vehicle sees hard driving, oil consumption, or extended idle time.
Is the NGK XR5 suitable for a performance or modified engine?The XR5 at heat range 5 is appropriate for high-compression naturally aspirated builds that need a hotter-range plug removed from the equation. For turbocharged or supercharged applications, confirm the heat range with your tuner before selecting NGK3332.
How many boxes of NGK XR5 do I need for a complete tune-up?Each box of NGK3332 contains 4 plugs. A 4-cylinder engine uses 4 plugs, so one box handles a full change. A 6-cylinder engine requires 6 plugs and a V8 engine requires 8 plugs, so order additional boxes to match your cylinder count.
Is the NGK XR5 the same as NGK part number 3332?Yes. XR5 is the alphanumeric designation covering the heat range and electrode configuration, while NGK3332 is the numeric catalog reference. Both identifiers refer to the exact same plug and can be used interchangeably when searching or cross-referencing part numbers.
Can the NGK XR5 resolve a persistent misfire on a performance build?If degraded or incorrect plugs are contributing to a misfire, replacing with fresh NGK3332 V-Power plugs can restore stable ignition. Always diagnose the full ignition system including coils, wires, and injectors before attributing a misfire solely to plug condition.
Installation Instructions
- Allow the engine to cool fully before removing spark plugs to protect aluminum head threads.
- Disconnect the ignition coil or plug wire from each cylinder before removal.
- Remove the existing plug counterclockwise using a spark plug socket with rubber insert.
- Check and adjust the gap on each NGK XR5 if required for your application.
- Thread the plug in by hand to avoid cross-threading, then torque to the engine manufacturer's specification.
- Reconnect ignition coils or wires and repeat for all remaining cylinders.
- Start the engine and confirm smooth idle with no misfire or fault 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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