NGK 4639 Spark Plug

NGK Laser Platinum Spark Plug Overview

The NGK Laser Platinum Spark Plug 4639 is engineered for reliable ignition performance in Acura NSX vehicles. Designed with precision materials and specifications, this spark plug supports efficient combustion and consistent engine operation.

• Part Number: 4639 (PFR6L-11)
• Compatible with Acura NSX models
• Center electrode tip made of platinum for durability
• Copper core center electrode for optimal conductivity
• Nickel ground electrode core with standard tip design
• Resistance rating of 5000 ohms to reduce electrical noise
• Non-removable nut electrical terminal type
• Flat seat type with 14mm thread diameter and 0.75" reach
• Pre-gap size of 0.044 inches for precise spark delivery
• Hex size of 5/8 inch for installation

About the NGK Laser Platinum Spark Plug Line

The Laser Platinum Spark Plug line from NGK combines platinum-tipped center electrodes with copper cores to balance durability and electrical performance. This design enhances ignition reliability and extends service life compared to conventional spark plugs. The 4639 model maintains these characteristics, making it suitable for high-performance applications like the Acura NSX.

Technical Details and Features

This NGK spark plug features a platinum center electrode tip that resists wear and maintains a consistent spark gap over time. The copper core center electrode improves thermal conductivity, helping to dissipate heat efficiently. The ground electrode is constructed from nickel with a standard tip and configuration, providing stable spark formation. The 5000 ohm resistance helps minimize electromagnetic interference with vehicle electronics. The spark plug’s flat seat and 14mm thread diameter ensure proper fitment and sealing in the combustion chamber. With a pre-gap of 0.044 inches and a reach of 0.75 inches, it meets the precise ignition requirements of the Acura NSX engine.

Applications and Problem Solving

• Restores consistent ignition performance in Acura NSX engines
• Reduces misfires caused by electrode wear or gap erosion
• Minimizes electrical interference affecting onboard electronics
• Improves fuel efficiency by maintaining optimal spark delivery
• Supports smooth engine start and idle stability

Installation Notes and Tips

When installing the NGK Laser Platinum Spark Plug 4639, ensure the spark plug gap is set to the specified 0.044 inches if adjustment is necessary. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended torque to avoid damage to the flat seat or threads. The 5/8 inch hex size allows for standard spark plug socket compatibility. Inspect the spark plug hole for debris before installation to ensure proper sealing and performance.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Laser Platinum Spark Plug 4639 undergoes rigorous testing for material integrity and electrical resistance. While specific warranty details are not provided here, NGK products typically come with manufacturer-backed quality assurance to support long-term use in Acura NSX vehicles.