The BR8EQ-14 is a standard nickel multi-ground spark plug from NGK, sold here as a box of 4. It is built around a 14mm thread, 19mm reach, and gasket seat configuration that appears across a wide range of older carbureted engines, marine powerplants, and powersport applications. The multi-ground electrode design provides multiple firing paths, which can help maintain ignition reliability as electrodes wear over time. Each plug includes a removable nut terminal for compatibility with both push-on and screw-in spark plug wire connections.
Multi-Ground Electrode Design
Unlike a standard single-ground plug, the BR8EQ-14 uses multiple ground electrodes arranged around the center electrode. When one ground electrode gap widens with normal wear, the spark can jump to an adjacent electrode that remains within a tighter gap, maintaining consistent ignition performance over more miles. This design is common in marine, powersport, and older industrial engines where service intervals are longer or less predictable and where a misfire can be more disruptive or harder to diagnose quickly.
Nickel Construction and Heat Range 8
The center electrode uses a 2.5mm nickel alloy tip, a proven material choice for standard replacement plugs in applications that do not require the longevity of platinum or iridium. The heat range of 8 places this plug toward the colder end of NGK’s heat range scale, meaning it transfers heat away from the firing tip more aggressively. A colder heat range is appropriate for engines running at sustained higher RPM or under heavier load, such as marine engines at wide-open throttle or powersport engines in competitive use.
Resistor Construction and 5k Ohm Suppression
The BR8EQ-14 includes a 5,000 Ohm internal resistor. This resistor suppresses electromagnetic interference generated during ignition, which is especially important in marine environments where onboard electronics, GPS units, VHF radios, and depth finders are sensitive to ignition noise. The resistor also reduces wear on distributor cap and rotor contacts in older ignition systems.
Confirming Fitment for Your Application
This is a universal spark plug, not a vehicle-specific replacement part. Applications include various marine outboard and inboard engines, powersport engines, and older carbureted street or off-road engines that specify a 14mm, 19mm reach, gasket seat plug at heat range 8. NGK’s online application guide is the authoritative source for confirming whether the BR8EQ-14 is correct for your specific engine model, year, and configuration.
Sold as a Box of 4
This listing is for a complete box of 4 NGK BR8EQ-14 plugs. Four-cylinder engine owners receive a full set in a single order. For V6, V8, or other cylinder counts, order the appropriate quantity of boxes. Each plug in the box is individually packaged in a protective wrapper to prevent shipping damage to the electrode and ceramic insulator.
What’s Included
- 4 x NGK BR8EQ-14 standard nickel multi-ground spark plugs
- Removable nut terminal pre-installed on each plug
- NGK specification card
Product Specifications
| Specification | Value |
|---|---|
| Manufacturer Part Number (MPN) | BR8EQ-14 |
| NGK Stock Number | 2329 |
| Quantity per Box | 4 |
| Thread Diameter | 14mm |
| Thread Pitch | 1.25mm |
| Seat Type | Gasket |
| Reach | 19mm (3/4 inch) |
| Hex Size | 13/16 inch (21mm) |
| Terminal Type | Removable Nut |
| Pre-Set Gap | 0.055 inch (1.4mm) |
| Center Electrode | Nickel standard, 2.5mm |
| Ground Electrode | Nickel multi-ground |
| Resistor | Yes, 5k Ohm |
| Heat Range | 8 |
| Estimated Longevity | Up to 50,000 miles (application-dependent) |
| Torque Spec (Cast Iron Head) | 18 to 25.3 lb-ft |
| Torque Spec (Aluminum Head) | 18 to 21.6 lb-ft |
| Warranty | NGK 60-day limited warranty |
| UPC | 087295123294 |
Frequently Asked Questions
What types of engines commonly use the BR8EQ-14?
The BR8EQ-14 is used primarily in older carbureted marine engines, powersport engines such as personal watercraft, ATVs, and snowmobiles, and some older carbureted automotive engines that specify a 14mm, 19mm reach, gasket seat plug at heat range 8. It is not designed for modern direct-injected or port fuel-injected gasoline street vehicle engines.
How do I confirm whether this plug fits my specific engine?
Use NGK’s online spark plug application guide at ngksparkplugs.com, where you can search by engine manufacturer, model, displacement, and year. Thread diameter, reach, seat type, and heat range must all match your engine’s specification.
Why does this plug have multiple ground electrodes?
The multi-ground design provides more than one path for the spark to jump from the center electrode. As the primary ground electrode gap widens through wear, the spark migrates to the next-closest electrode, extending effective service life and reducing intermittent misfires.
Do I need to gap the plugs before installation?
NGK sets the gap at the factory to 0.055 inch (1.4mm). However, your specific engine may call for a different gap. Check your engine manufacturer’s service documentation and verify or adjust before installation.
What torque should I use when installing the BR8EQ-14?
For cast iron cylinder heads, torque each plug to between 18 and 25.3 lb-ft. For aluminum cylinder heads, use 18 to 21.6 lb-ft. Always install spark plugs with the engine cold to avoid galling the threads.
Is the removable nut terminal already attached?
Yes. Each plug ships with the removable nut terminal pre-installed. If your spark plug wires use a push-on connector, unscrew the nut terminal and set it aside. If your wires use a screw-on connector, leave the nut in place.
What is the estimated service life of the BR8EQ-14?
NGK rates these plugs for up to 50,000 miles under normal operating conditions. Actual service life varies significantly by application; marine and powersport engines may see shorter intervals. Follow your engine manufacturer’s service schedule.
What does NGK’s 60-day warranty cover for these plugs?
NGK’s standard 60-day limited warranty covers defects in materials and workmanship present at the time of manufacture. It does not cover plugs that have been installed in the wrong application, improperly gapped, or damaged during installation. Under the Magnuson-Moss Warranty Act, the full terms are available from NGK prior to purchase.
Is this plug appropriate for a modern fuel-injected car or truck?
Generally no. Modern fuel-injected street vehicle engines typically require iridium or platinum fine-wire plugs. The BR8EQ-14 is a nickel standard plug designed for older carbureted and magneto-ignition engines. Installing the wrong plug type in a modern engine can cause misfires and fault codes.
Warranty Information
Each BR8EQ-14 plug is covered by NGK’s 60-day limited warranty against defects in materials and workmanship. Under the Magnuson-Moss Warranty Act, the complete warranty terms must be disclosed prior to purchase.
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