Description
The NGK 4838 BP8H-N-10 is a V-Power series spark plug designed to improve ignition efficiency and engine performance. Its V-cut nickel center electrode directs the spark to the edge, allowing for faster flame propagation, better ignitability, and reduced quenching.
Built with a strengthened ground electrode and a copper core, this plug offers enhanced durability and efficient heat dissipation—making it a solid choice for marine and small engine applications that demand reliable performance.
Key Features
-
V-Power V-cut center electrode for improved ignitability and faster combustion
-
Strengthened ground electrode for increased durability
- 98% pure copper core for superior heat dissipation
- Trivalent metal plating for corrosion resistance and anti-seize
- Triple gasket sealing prevents combustion leakage
- High-grade ceramic insulator for strength and heat transfer
- Projected tip design improves combustion efficiency
Specifications
General
- Part Number: BP8H-N-10
- Stock Number: 4838
- Heat Range: 8 (cold)
- Resistor: No (non-resistor type)
- Gap: 1.0 mm (.039")
Shell
- Thread Size: 14mm x 1.25
- Seat Type: Gasket
- Reach: 12.7 mm (1/2")
- Hex Size: 13/16" (21 mm)
- Terminal: Solid
Electrodes
- Center Electrode: Nickel (V-cut design)
- Ground Electrode: Nickel (strengthened)
- Configuration: Standard J-gap
- Projection: Projected tip
Fitment Highlights
Marine – Outboard Engines
Mercury / Mariner
- 6 HP – 125 HP (various models)
- 8 HP, 9.9 HP
- 20 / 25 / 30 / 40 / 50 / 60 HP
- Sea Pro, Marathon, BigFoot, Jet variants
(Used across a wide range of 14mm plug marine outboard engines—verify exact fitment before purchase.)
Performance Notes
-
Heat range 8 = colder plug, suited for higher-performance or sustained-load engines
- Non-resistor design may not be suitable for systems requiring RF suppression
- V-Power design improves throttle response and starting performance
- Ideal for marine and small engine applications requiring a projected-tip plug
