Denso 5318 Spark Plug

Overview of Denso Iridium Power Spark Plug 5318

The Denso Iridium Power 5318 spark plug is engineered for reliable secondary ignition performance. Designed with advanced materials and precise specifications, it supports efficient combustion and consistent engine operation in various vehicle applications.

• Iridium center electrode tip for enhanced durability
• Tapercut, u-groove ground electrode tip design
• Copper core center electrode for improved conductivity
• Nickel ground electrode core material with standard ground configuration
• Flat seat type with 14.00 mm thread diameter and 19.00 mm reach
• Pre-gap size of 0.7 mm and manufacturer heat range of 29
• Hex size of 20.6 mm for installation

Detailed Features and Specifications

The Denso Iridium Power 5318 spark plug incorporates a copper core center electrode with an iridium tip, which provides a balance of excellent electrical conductivity and wear resistance. The ground electrode features a tapercut, u-groove tip design made from nickel, optimizing spark exposure and combustion efficiency. With a single ground electrode and a standard ground configuration, this spark plug maintains consistent ignition performance. The flat seat type ensures proper sealing in compatible cylinder heads, while the 14.00 mm thread diameter and 19.00 mm reach fit specific engine designs. The pre-gap size of 0.7 mm is factory set to support optimal spark timing, and the heat range of 29 aligns with manufacturer specifications for thermal management. The 20.6 mm hex size facilitates installation using standard tools.

About the Iridium Power Product Line

Denso's Iridium Power line focuses on delivering spark plugs with iridium-tipped center electrodes, which offer enhanced durability and stable ignition compared to conventional plugs. The Iridium Power series is designed to improve throttle response and fuel efficiency by providing a more precise and consistent spark. The 5318 model is part of this line, combining iridium technology with copper core electrodes and specialized ground electrode designs to meet the demands of modern engines.

Applications and Problem Solving

• Compatible with vehicles requiring a 14 mm thread diameter and 19 mm reach spark plug
• Addresses misfires caused by electrode wear or poor spark quality
• Helps reduce rough idling and improve engine start-up reliability
• Supports efficient combustion to lower emissions and fuel consumption
• Suitable for engines needing a heat range 29 spark plug for optimal thermal performance

Installation Notes and Tips

Ensure the spark plug gap is set to 0.7 mm before installation if adjustment is necessary. Use a 20.6 mm socket or wrench for proper tightening torque to avoid damage to the electrode or threads. Confirm compatibility with your vehicle’s engine specifications, particularly thread diameter, reach, and seat type, to ensure proper fit and sealing. Avoid over-tightening to prevent thread damage or distortion of the flat seat.

Quality Assurance

Denso manufactures the Iridium Power 5318 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. While specific warranty details depend on the vehicle manufacturer or distributor, Denso products typically come with coverage against manufacturing defects.