Denso 5731 Spark Plug

Overview of Denso Iridium Racing Spark Plug 5731

The Denso Iridium Racing spark plug 5731 is engineered for drivers seeking reliable ignition performance. Designed with advanced materials, it supports efficient combustion and consistent engine operation in various vehicle makes and models.

• Iridium center electrode tip for enhanced durability
• Full platinum ground electrode tip design
• Slant ground configuration for optimized spark exposure
• Copper center electrode core for improved conductivity
• Nickel ground electrode core material for strength
• Pre-gap size of 0.6 mm for precise ignition timing
• Flat seat type with 19.00 mm reach and 12.00 mm thread diameter
• Hex size of 16.0 mm for standard installation tools
• Manufacturer heat range rating of 27
• Resistance of 5000 ohms to reduce electrical noise

Details on the Iridium Racing Product Line

The Iridium Racing line by Denso focuses on delivering spark plugs with superior electrode materials and design to support high-performance ignition systems. This product line incorporates iridium and platinum tips to provide longer service life and stable spark delivery, suitable for racing and performance-oriented vehicles.

Technical Description of the Denso 5731 Spark Plug

The Denso 5731 spark plug features an iridium center electrode tip, known for its high melting point and wear resistance, which contributes to consistent ignition and extended plug life. The ground electrode uses a full platinum tip with a slant configuration, enhancing spark exposure and combustion efficiency. The copper core center electrode improves electrical conductivity, while the nickel core ground electrode ensures durability under high temperatures. With a pre-gap size of 0.6 mm, this spark plug is calibrated for precise ignition timing. The flat seat design and 19.00 mm reach make it compatible with a range of engines requiring these specifications. The 5000 ohm resistance helps minimize electromagnetic interference with vehicle electronics.

Applications and Common Issues Addressed

• Improves ignition reliability in vehicles experiencing misfires
• Reduces fouling and electrode wear in high-performance engines
• Supports stable combustion in engines with ignition timing sensitivity
• Helps maintain fuel efficiency by ensuring consistent spark delivery
• Mitigates electrical noise affecting onboard electronics

Installation Notes and Tips

When installing the Denso 5731 spark plug, ensure the correct torque is applied to avoid damage to the flat seat. Use a 16.0 mm socket for proper fitment. Verify the pre-gap size of 0.6 mm before installation to match manufacturer specifications. This spark plug is compatible with vehicles requiring a 12.00 mm thread diameter and 19.00 mm reach. Always consult the vehicle’s service manual for specific installation procedures and heat range compatibility.

Quality Assurance and Warranty

Denso manufactures the 5731 spark plug to meet strict quality standards, ensuring consistent performance and durability. The use of iridium and platinum materials reflects a focus on longevity and reliability. While specific warranty details are not provided, Denso products typically come with manufacturer-backed quality assurance to support customer confidence.