NGK 3981 Spark Plug

Reliable Ignition with NGK Iridium IX Spark Plug 3981

The NGK Iridium IX Spark Plug 3981 delivers consistent ignition performance designed for a range of vehicle applications. Engineered with durable materials and precise specifications, this spark plug supports efficient combustion and reliable engine operation.

• Iridium center electrode tip for enhanced durability and ignition
• Taper cut ground electrode tip design for improved spark exposure
• Copper core center electrode for optimal conductivity
• Standard ground configuration with nickel ground electrode core
• Removable nut electrical terminal type for flexible installation
• Pre-gap size of .032 inches for precise spark gap
• Flat seat type with 14mm thread diameter and .75 inch reach
• Hex size 13/16 inch for standard tool compatibility
• Manufacturer heat range 9 suitable for various engine conditions

About the NGK Iridium IX Spark Plug Line

The Iridium IX Spark Plug line from NGK is designed to provide enhanced ignition performance through the use of a fine iridium center electrode tip. This design improves spark efficiency and durability compared to conventional plugs. The 3981 part number is part of this line, offering a balance of heat range and electrode design optimized for secondary ignition systems in many automotive engines.

Technical Details and Performance

The NGK 3981 spark plug features a copper core center electrode that ensures excellent electrical conductivity, paired with an iridium tip that resists wear and maintains a consistent spark over time. The taper cut ground electrode tip increases spark exposure, which can contribute to more complete combustion. The nickel ground electrode core provides durability, while the removable nut electrical terminal type allows for easier installation or replacement in various vehicle models. With a pre-gap size of .032 inches and a flat seat type, this spark plug fits securely and maintains proper gap settings for reliable ignition.

Common Applications and Problem Solving

• Improves engine misfire issues caused by worn or damaged spark plugs
• Enhances fuel efficiency by promoting complete combustion
• Reduces rough idling and hesitation during acceleration
• Supports stable ignition in vehicles requiring a heat range 9 spark plug
• Compatible with vehicles needing a 14mm thread diameter and .75 inch reach spark plug

Installation Notes and Tips

When installing the NGK Iridium IX Spark Plug 3981, ensure the spark plug gap is set to the specified .032 inches if adjustment is necessary. Use a 13/16 inch socket for proper torque application to avoid over-tightening. The flat seat design requires proper seating against the cylinder head to maintain compression and prevent leaks. The removable nut terminal allows for flexible connection to various ignition wires or boots.

Quality Assurance and Warranty

NGK spark plugs, including the Iridium IX 3981, are manufactured to meet strict quality standards for durability and performance. While specific warranty details are not provided here, NGK products typically come with manufacturer-backed quality assurance to support reliable operation in compatible vehicles.