Denso 4101 Spark Plug

Reliable Ignition with Denso U-Groove Conventional Spark Plug 4101

The Denso U-Groove Conventional Spark Plug 4101 is engineered to deliver consistent ignition performance for a variety of vehicles. Designed with precision materials and a unique U-groove ground electrode tip, this spark plug supports efficient combustion and reliable engine operation.

• U-groove ground electrode tip design for improved spark exposure
• Nickel ground electrode core and center electrode tip for durability
• Copper center electrode core for optimal conductivity
• Standard ground configuration with a single ground electrode
• Flat seat type with 19.00 mm reach and 12.00 mm thread diameter
• Pre-gap size of 0.7 mm for precise spark gap
• Hex size of 18.0 mm for standard installation tools
• Manufacturer heat range of 24 suitable for moderate engine temperatures
• Resistance of 5000 ohms to reduce electrical noise interference

About the U-Groove Conventional Product Line

The U-Groove Conventional line from Denso features spark plugs with a distinctive U-groove ground electrode tip design. This design increases the spark exposure area, which can enhance ignition efficiency and combustion stability. The conventional construction balances durability and performance, making it suitable for a wide range of gasoline engines requiring reliable secondary ignition components.

Technical Details and Performance

This spark plug incorporates a copper core center electrode, known for excellent thermal conductivity, paired with a nickel tip to withstand wear and corrosion. The single nickel ground electrode with a U-groove tip improves spark distribution and flame kernel development. With a flat seat and a 19 mm reach, the Denso 4101 spark plug fits engines designed for this specification, ensuring proper sealing and heat dissipation. The 5000 ohm resistance helps minimize radio frequency interference, protecting vehicle electronics.

Applications and Common Issues Addressed

• Restores stable ignition in vehicles experiencing misfires or rough idling
• Helps reduce engine hesitation during acceleration
• Improves fuel combustion efficiency for smoother engine performance
• Addresses spark plug fouling caused by carbon deposits
• Supports consistent spark delivery in moderate heat range engines

Installation Notes and Tips

Ensure the spark plug gap is set to the specified 0.7 mm pre-gap before installation. Use an 18 mm socket wrench for proper tightening to avoid damage to the flat seat. Verify compatibility with your vehicle’s engine specifications, particularly thread diameter (12 mm) and reach (19 mm), to ensure correct fitment. Avoid over-tightening to prevent thread damage.

Quality Assurance and Warranty

Denso manufactures the U-Groove Conventional spark plugs under strict quality control standards to meet OEM specifications. The materials and design are selected to provide consistent performance and durability. While specific warranty details are not provided, Denso products typically adhere to industry standards for reliability and manufacturing quality.