NGK 4055 Spark Plug

NGK Iridium IX Spark Plug Overview

The NGK Iridium IX Spark Plug 4055 is engineered for reliable ignition performance in a range of vehicles including Audi, Honda, Porsche, and Mercedes-Benz models. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Iridium center electrode tip for enhanced durability and ignition
• Taper cut ground electrode tip 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 0.032 inches for precise spark gap
• Flat seat type with 14mm thread diameter and 0.75 inch reach
• Hex size of 13/16 inch for standard wrench compatibility
• Manufacturer heat range of 7 suitable for various engine conditions

Iridium IX Spark Plug Product Line Details

The Iridium IX Spark Plug line by NGK is designed to provide enhanced ignition performance through the use of iridium, a metal known for its high melting point and wear resistance. This product line focuses on delivering consistent spark energy and longer service life compared to conventional spark plugs. The 4055 part number within this line features a copper core center electrode combined with an iridium tip, balancing conductivity and durability for improved combustion efficiency.

Technical Description and Specifications

The NGK 4055 spark plug incorporates a copper core center electrode with an iridium tip, which ensures excellent electrical conductivity and resistance to electrode wear. The taper cut ground electrode tip design increases spark exposure, promoting better ignition and combustion. The ground electrode is made from nickel, providing structural integrity. With a pre-gap size of 0.032 inches and a flat seat type, this spark plug is engineered for precise fitment and optimal spark gap maintenance. The removable nut electrical terminal type allows for easier installation and replacement. Its 14mm thread diameter, 0.75 inch reach, and 13/16 inch hex size make it compatible with a variety of ignition systems.

Compatible Vehicles and Applications

• Compatible with Audi models such as the 228i and Quattro
• Suitable for Honda Civic and Colt engines
• Fits Porsche 911, 924, and 944 models
• Applicable to Mercedes-Benz 300SL and other models
• Also compatible with Chrysler, Dodge, Ferrari, Lamborghini, Maserati, Mitsubishi, and other vehicles listed in fitment

Common Issues Addressed by NGK 4055 Spark Plug

• Misfiring or inconsistent engine ignition
• Reduced fuel efficiency due to incomplete combustion
• Difficulty starting the engine in cold conditions
• Engine hesitation or rough idling
• Premature electrode wear affecting spark quality

Installation Notes and Tips

• Verify correct gap size of 0.032 inches before installation
• Use a 13/16 inch socket wrench for proper torque application
• Ensure the spark plug seat is clean and free of debris
• Apply anti-seize compound sparingly on threads if recommended by vehicle manufacturer
• Check removable nut terminal for secure electrical connection

Quality Assurance and Warranty

NGK spark plugs, including the Iridium IX 4055, are manufactured to meet strict quality standards for durability and performance. The use of iridium and copper materials ensures long service life and consistent ignition. While specific warranty details may vary, NGK products typically come with manufacturer-backed quality assurance to support reliable operation in compatible vehicles.