Denso 5381 Spark Plug

Reliable Ignition Performance with Denso Iridium Power Spark Plug 5381

The Denso Iridium Power spark plug 5381 is engineered to deliver consistent ignition and efficient combustion. Designed with advanced materials and precise specifications, it supports optimal engine performance for various vehicle makes and models requiring a 14mm thread diameter and 12.7mm reach.

• Iridium center electrode tip for enhanced durability and ignition
• Tapercut, u-groove ground electrode tip design for improved spark exposure
• Copper core center electrode for superior conductivity
• Nickel ground electrode core material with standard ground configuration
• Flat seat type with 0.8mm pre-gap size for precise spark gap
• Hex size of 20.6mm for easy installation
• Manufacturer heat range rating of 27 for balanced thermal performance
• Single ground electrode for consistent spark delivery
• Resistance rating of 5000 ohms to reduce electrical noise

About the Denso Iridium Power Product Line

The Iridium Power line from Denso focuses on delivering spark plugs with iridium-tipped electrodes that provide a fine spark for improved combustion efficiency. This product line is designed to enhance throttle response and fuel economy while maintaining long service life. The 5381 spark plug benefits from this technology, making it suitable for drivers seeking reliable ignition components compatible with specific vehicle applications.

Technical Details and Specifications

The Denso 5381 spark plug features a copper core center electrode with an iridium tip, combining excellent conductivity with wear resistance. The ground electrode uses a tapercut, u-groove design made from nickel, which helps optimize spark exposure and combustion. With a flat seat and a pre-gap size of 0.8mm, this spark plug ensures consistent ignition timing. The thread diameter of 14.00mm and reach of 12.70mm make it compatible with various vehicle engines requiring these dimensions. The resistance of 5000 ohms helps minimize electromagnetic interference, supporting stable engine electronics.

Applications and Common Issues Addressed

• Improves ignition reliability in vehicles with 14mm spark plug requirements
• Reduces misfires caused by electrode wear or improper gap
• Enhances throttle response and fuel efficiency through precise spark delivery
• Addresses rough idling and poor acceleration linked to spark plug degradation
• Supports stable engine performance in moderate to high heat range conditions

Installation Notes and Tips

Ensure the spark plug gap is set to 0.8mm before installation if adjustment is necessary. Use a 20.6mm socket wrench for proper tightening torque to avoid damage to the flat seat. Verify compatibility with your vehicle’s make and model by confirming thread diameter and reach specifications. Avoid over-tightening to maintain the integrity of the spark plug and cylinder head threads.

Quality Assurance and Warranty

Denso manufactures the 5381 spark plug to meet strict quality standards, ensuring consistent performance and durability. The use of iridium and copper materials supports long service life under normal operating conditions. Warranty coverage details should be confirmed with the vehicle manufacturer or parts distributor, as they may vary by application and region.