NGK 2438 V-Power WR5 Spark Plug, Nickel, Resistor, 18mm Thread

The NGK 2438 V-Power spark plug (heat range 5, NGK plug number WR5) is a nickel alloy resistor spark plug built to OE-quality standards. NGK is a major OE spark plug supplier with a long history of making plugs for automotive, motorcycle, marine and small engine applications. This plug suits engines that originally came with nickel alloy spark plugs.

Key Features:

• V-cut nickel alloy center electrode: sends the spark to the edge of the electrode, which improves ignitability. That means quicker starts and a smoother idle.
• Copper core: improves heat dissipation and conductivity across a wide heat range.
• High-grade alumina silicate ceramic insulator: gives strong dielectric performance and good heat transfer.
• Trivalent metal plating: resists corrosion and seizing, so the plug installs and removes more easily.
• Cold-rolled threads: help prevent cross-threading and cylinder head damage.
• Triple seals and corrugated insulator ribs: help prevent leakage and flashover.
• Resistor design: 5k ohm resistor.

Specifications:

• Thread diameter: 18mm
• Thread pitch: 1.5mm
• Seat type: Tapered
• Hex size: 13/16 in. (21mm)
• Terminal type: Solid
• Pre-set gap: 0.039 in. (1.0mm)
• Heat range: 5
• Center electrode: Nickel, V-cut, 2.5mm, projected
• Ground electrode: Nickel, standard
• Torque (cast iron or aluminum heads): 14.5-21.6 lb-ft

This plug works best in engines that came with OE nickel alloy plugs. It is not recommended for engines that came with factory precious metal plugs.