Denso 4129 Spark Plug

Reliable Ignition Performance with Denso U-Groove Conventional Spark Plug

The Denso 4129 spark plug is engineered to deliver consistent ignition performance for a variety of vehicles. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Resistance: 5000 ohms for optimal electrical performance
• Ground Electrode Tip Design: Standard for reliable spark delivery
• Ground Electrode Core Material: Nickel for durability
• Center Electrode Core Material: Copper to enhance conductivity
• Center Electrode Tip Material: Nickel for wear resistance
• Pre-Gap Size: 0.9 mm for precise spark gap
• Hex Size: 18.0 mm for standard installation tools
• Manufacturer Heat Range: 27 suitable for moderate engine temperatures
• Seat Type: Flat for secure sealing
• Reach: 19.00 mm to fit specific engine designs
• Thread Diameter: 14.00 mm compatible with common engine threads

About the Denso U-Groove Conventional Product Line

The U-Groove Conventional line from Denso focuses on spark plugs with a unique U-shaped groove on the center electrode. This design improves ignitability and combustion efficiency by increasing the spark exposure area. The Denso 4129 spark plug benefits from this technology, providing stable ignition and consistent engine performance in compatible vehicles.

Technical Details and Application

The Denso 4129 spark plug features a copper core center electrode that enhances thermal conductivity, helping to dissipate heat effectively. The nickel ground electrode and tip provide durability against wear and corrosion. With a pre-gap size of 0.9 mm and a heat range of 27, this spark plug is suited for engines requiring moderate heat dissipation. The flat seat type and 14 mm thread diameter ensure proper fitment and sealing in compatible engines.

Common Uses and Problem Solving

• Restores stable ignition in engines experiencing misfires
• Improves fuel efficiency by ensuring complete combustion
• Reduces engine hesitation during acceleration
• Helps maintain smooth idling and consistent power delivery
• Prevents fouling in engines with moderate operating temperatures

Installation Notes and Tips

When installing the Denso 4129 spark plug, ensure the pre-gap of 0.9 mm is maintained or adjusted according to the vehicle manufacturer’s specifications. Use an 18 mm socket wrench for proper tightening. Confirm compatibility with your vehicle’s engine specifications, including thread diameter and reach, to avoid damage or improper sealing.

Quality Assurance and Warranty

Denso manufactures the 4129 spark plug to meet strict quality standards, using high-grade materials such as copper and nickel for electrode construction. While specific warranty details are not provided, Denso products typically adhere to industry standards for durability and performance.