NGK 6441 Spark Plug

Reliable Ignition Performance for Acura, BMW, Ford, and More

The NGK Iridium IX Spark Plug 6441 is engineered to deliver consistent ignition and improved combustion for a wide range of vehicles including Acura, BMW, Ford, Honda, and Volkswagen models. Designed with durable materials and precise specifications, this spark plug supports efficient engine operation and longevity.

• Iridium center electrode tip for enhanced durability and ignition
• Taper cut ground electrode tip design for optimized spark exposure
• Copper core center electrode for excellent conductivity
• Standard ground configuration with nickel ground electrode core
• Non-removable nut electrical terminal type for secure connection
• Pre-gap size of 0.044 inches for precise spark gap
• Flat seat type with 14mm thread diameter and 0.75 inch reach
• Hex size of 5/8 inch for easy installation
• Manufacturer heat range rating of 6 for balanced heat dissipation

About the NGK Iridium IX Spark Plug Line

The Iridium IX Spark Plug line from NGK is designed to provide improved ignition performance and longer service life compared to conventional spark plugs. Featuring an iridium center electrode tip, these plugs offer enhanced wear resistance and stable spark delivery, which is critical for maintaining engine efficiency in vehicles such as the BMW 550i, Ford F-150, and Honda Civic. The 6441 part number is a specific fitment within this line, tailored to meet the ignition requirements of various makes and models.

Technical Details and Compatibility

This spark plug features a copper core center electrode combined with an iridium tip, ensuring excellent electrical conductivity and durability. The taper cut ground electrode tip design improves spark exposure, contributing to more complete combustion. With a pre-gap size of 0.044 inches and a flat seat type, the NGK 6441 spark plug fits vehicles requiring a 14mm thread diameter and 0.75 inch reach. Compatible with models such as the Acura TL, Dodge Ram 1500, Volkswagen Jetta, and Mazda MX-6, this spark plug supports reliable ignition across a broad range of secondary ignition systems.

Common Applications and Problem Solving

• Restores engine misfire issues caused by worn or fouled spark plugs
• Improves cold start performance in Acura, Honda, and Ford vehicles
• Enhances fuel efficiency by promoting complete combustion
• Reduces rough idling and hesitation in models like the Jeep Grand Cherokee and Dodge Durango
• Supports stable ignition in high-performance engines such as BMW 650i and 750Li

Installation Notes and Tips

When installing the NGK Iridium IX Spark Plug 6441, ensure the spark plug gap is set to the manufacturer’s recommended specification, typically 0.044 inches for this part. Use a torque wrench to tighten the spark plug to the vehicle’s specified torque to avoid damage to the threads or seat. The 5/8 inch hex size allows for standard spark plug socket compatibility. Always inspect the ignition system components for wear or damage during replacement to maintain optimal performance.

Quality Assurance and Warranty

NGK spark plugs are manufactured to strict quality standards to ensure consistent performance and durability. The Iridium IX line undergoes rigorous testing for heat range, electrode wear, and electrical resistance, with this model featuring a resistance rating of 5000 ohms. While specific warranty details may vary, NGK products typically come with manufacturer-backed quality assurance to support reliable ignition system operation.