NGK 5851 Spark Plug

NGK Laser Platinum Spark Plug Overview

The NGK Laser Platinum Spark Plug 5851 is engineered for reliable ignition performance in high-end vehicles like the Ferrari 360 Coupe and Spyder. Designed with precision materials and specifications, this spark plug supports efficient combustion and consistent engine operation.

• Part Number: 5851 (PMR8A)
• Center Electrode Tip Material: Platinum for enhanced durability
• Center Electrode Core Material: Copper for optimal conductivity
• Ground Electrode Core Material: Nickel with standard tip design
• Resistance: 5000 ohms to reduce electrical noise
• Pre-Gap Size: 0.028 inches for precise spark delivery
• Thread Diameter: 10.00 mm with 0.75 inch reach
• Hex Size: 5/8 inch for standard installation tools
• Seat Type: Flat for secure sealing
• Manufacturer Heat Range: 8 suitable for specific engine requirements
• Electrical Terminal Type: Non-removable nut

About the NGK Laser Platinum Spark Plug Line

The Laser Platinum Spark Plug line from NGK features advanced platinum-tipped electrodes that provide longer service life and stable ignition performance. This technology reduces electrode wear and maintains consistent spark intensity, which is critical for vehicles like the Ferrari 360 Coupe and Spyder that demand precise ignition timing and durability under high-performance conditions.

Technical Details and Compatibility

This NGK spark plug is specifically compatible with Ferrari and Maserati models, including the Ferrari 360 Coupe and Spyder. The plug’s copper core center electrode ensures excellent thermal conductivity, while the platinum tip enhances electrode longevity. The single ground electrode with a nickel core and standard design supports reliable spark formation. The 5000 ohm resistance helps minimize electromagnetic interference with vehicle electronics.

Common Applications and Problem Solving

• Restores consistent ignition in Ferrari 360 Coupe and Spyder engines
• Reduces misfires caused by worn or damaged spark plugs
• Improves fuel efficiency by ensuring complete combustion
• Minimizes engine hesitation and rough idling
• Supports stable engine performance under high load conditions

Installation Notes and Tips

When installing the NGK Laser Platinum Spark Plug 5851, ensure the spark plug gap is set to the specified pre-gap size of 0.028 inches if adjustment is needed. Use a 5/8 inch socket for proper torque application. The flat seat type requires careful tightening to avoid damage to the sealing surface. The non-removable nut terminal type means no additional terminal adjustments are necessary. Always follow manufacturer torque specifications to prevent thread damage.

Quality Assurance and Warranty

NGK spark plugs are manufactured to meet strict quality standards, ensuring reliable performance and durability. The Laser Platinum Spark Plug 5851 undergoes rigorous testing for heat range, resistance, and electrode integrity. While specific warranty details are not provided here, NGK products typically come with manufacturer-backed quality assurance to support long-term use in compatible Ferrari and Maserati models.