NGK 91961 Spark Plug

Overview of NGK Laser Iridium High Ignitability Spark Plug 91961

The NGK Laser Iridium High Ignitability Spark Plug 91961 is engineered for reliable ignition performance in select Lexus models. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Part Number: 91961 (Dilfr7k9g)
• Brand Line: Laser Iridium High Ignitability Spark Plug
• Ground Electrode Tip Design: Dual fine electrode for high ignitability
• Center Electrode Tip Material: Iridium
• Core Materials: Copper for both center and ground electrodes
• Resistance: 5000 ohms
• Pre-Gap Size: 0.036 inches
• Thread Diameter: 14.00 mm with 26.5 mm reach
• Hex Size: 5/8 inch
• Seat Type: Flat
• Electrical Terminal Type: Non-removable nut
• Manufacturer Heat Range: 7

Product Line Details: Laser Iridium High Ignitability Spark Plug

The Laser Iridium High Ignitability Spark Plug line by NGK focuses on delivering enhanced ignition capabilities through the use of iridium-tipped center electrodes and a dual fine ground electrode design. This combination improves spark efficiency and durability, making it suitable for modern engines requiring precise ignition timing and stable combustion. The 91961 spark plug exemplifies these features, optimized for secondary ignition systems in compatible Lexus vehicles.

Technical Description and Compatibility

This NGK spark plug features a copper core for both the center and ground electrodes, which aids in heat dissipation and electrical conductivity. The iridium center electrode tip provides a fine, durable spark point that supports high ignitability and longevity. The dual fine electrode ground tip design further enhances ignition reliability by reducing voltage requirements and improving spark exposure. With a resistance of 5000 ohms, it ensures proper suppression of electrical noise. The flat seat and 26.5 mm reach are designed to fit specific engine configurations, making it compatible with Lexus GS200t, GS300, IS200t, IS300, NX200t, NX300, RC200t, and RC300 models.

Applications and Problem Solving

• Improves ignition performance in Lexus GS and IS series turbocharged engines
• Reduces misfires and rough idling caused by worn or inefficient spark plugs
• Supports stable combustion for better fuel efficiency and emissions control
• Addresses ignition issues related to electrode wear and corrosion
• Enhances engine start-up reliability in NX and RC Lexus models

Installation Notes and Tips

• Ensure the spark plug gap is set to 0.036 inches before installation
• Use a torque wrench to tighten to manufacturer specifications to avoid damage
• Check for proper thread engagement and seat type compatibility (flat seat)
• Replace spark plugs in sets to maintain consistent engine performance
• Inspect ignition components for wear or damage during installation

Quality Assurance and Warranty

NGK spark plugs, including the Laser Iridium High Ignitability Spark Plug 91961, are manufactured to meet strict quality standards for durability and performance. The use of iridium and copper materials ensures long service life and reliable ignition. While specific warranty details may vary, NGK products typically come with manufacturer-backed quality assurance to support their intended use in compatible Lexus vehicles.