NGK 6664 Spark Plug

NGK Iridium IX Spark Plug Overview

The NGK Iridium IX Spark Plug 6664 is engineered for reliable ignition performance in select Honda and Porsche vehicles. 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
• Nickel ground electrode core with taper cut design for optimal spark exposure
• Standard ground configuration with a single ground electrode
• 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 rating of 7 suitable for specific engine requirements

Detailed Product Description

The NGK Iridium IX Spark Plug 6664 features a copper core center electrode with an iridium tip, providing a balance of excellent conductivity and wear resistance. The taper cut ground electrode, made from nickel, enhances spark exposure to improve combustion efficiency. This spark plug has a resistance rating of 5000 ohms, which helps reduce electrical noise and interference. Its removable nut electrical terminal allows for easier installation and maintenance. With a pre-gap size of 0.032 inches and a flat seat design, it ensures a secure fit and consistent spark gap. The 14mm thread diameter and 0.75 inch reach make it compatible with specific Honda and Porsche models, including the Honda Accord, Prelude, and Porsche 911.

About the Iridium IX Spark Plug Line

The Iridium IX Spark Plug line by NGK is designed to deliver improved ignition performance and durability compared to conventional spark plugs. Utilizing an iridium center electrode tip, these plugs offer enhanced wear resistance and a more focused spark, which can contribute to better throttle response and fuel efficiency. The 6664 part number is part of this line, tailored to meet the ignition needs of select secondary ignition systems in Honda and Porsche vehicles.

Applications and Problem Solving

• Compatible with Honda Accord, Honda Prelude, and Porsche 911 models requiring a 14mm spark plug with a heat range of 7
• Addresses issues related to misfires and inconsistent ignition
• Helps reduce engine hesitation and improve throttle response
• Supports stable combustion to minimize rough idling
• Suitable for replacing worn or fouled spark plugs to restore engine performance

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.032 inches to ensure optimal performance. Use a 13/16 inch socket wrench for proper tightening. The removable nut terminal allows for easier connection to ignition wires. Ensure the spark plug is threaded in by hand initially to avoid cross-threading. Torque to manufacturer specifications to prevent damage to the cylinder head or spark plug.

Quality Assurance and Warranty

NGK spark plugs are manufactured to strict quality standards to ensure reliable performance and longevity. The Iridium IX Spark Plug 6664 undergoes rigorous testing for durability and electrical consistency. While specific warranty details may vary, NGK typically offers coverage against manufacturing defects. Refer to NGK’s official documentation for complete warranty information.