Denso 5720 Spark Plug

Overview of Denso Iridium Racing Spark Plug 5720

The Denso Iridium Racing spark plug 5720 is engineered for Mazda RX-7 vehicles requiring reliable secondary ignition components. Designed with advanced materials and precise specifications, this spark plug supports consistent engine performance and efficient combustion.

• Iridium center electrode tip for enhanced durability
• Full platinum ground electrode tip design
• Slant ground configuration with a single ground electrode
• Copper core center electrode for optimal conductivity
• Flat seat type with 14.00 mm thread diameter and 21.50 mm reach
• Pre-gap size of 0.7 mm for precise ignition timing
• Manufacturer heat range rating of 31
• Hex size of 20.6 mm for installation

Detailed Features and Specifications

This Denso Iridium Racing spark plug 5720 features an iridium center electrode tip, known for its high melting point and wear resistance, which contributes to longer service life and stable ignition. The ground electrode tip is fully platinum-coated, enhancing electrode durability and reducing erosion. The slant ground configuration with a single nickel core electrode optimizes spark exposure and combustion efficiency. The copper core center electrode improves thermal conductivity, helping to dissipate heat effectively during operation.

With a pre-gap size of 0.7 mm, this spark plug ensures accurate spark gap for consistent ignition. The flat seat type and 14.00 mm thread diameter provide secure fitment in the combustion chamber, while the 21.50 mm reach suits the Mazda RX-7 engine design. The heat range of 31 is calibrated to maintain optimal operating temperature under racing conditions.

About the Iridium Racing Product Line

The Iridium Racing line by Denso is tailored for performance-oriented ignition components. This product line focuses on combining iridium and platinum materials to deliver enhanced durability and stable ignition performance under demanding conditions. The 5720 spark plug exemplifies this approach, offering a balance of longevity and efficient combustion for Mazda RX-7 engines.

Applications and Problem Solving

• Compatible with Mazda RX-7 models requiring secondary ignition spark plugs
• Addresses misfires caused by electrode wear or corrosion
• Improves cold start performance and throttle response
• Reduces fouling and carbon buildup in the combustion chamber
• Helps maintain consistent engine power and fuel efficiency

Installation Notes and Tips

When installing the Denso Iridium Racing spark plug 5720, ensure the pre-gap is set to 0.7 mm if adjustment is necessary. Use a 20.6 mm hex socket for proper torque application. Verify the flat seat type matches the engine’s cylinder head design to prevent compression leaks. It is recommended to replace spark plugs in sets to maintain balanced engine performance.

Quality Assurance and Warranty

Denso manufactures the Iridium Racing spark plug 5720 to meet strict quality standards, ensuring reliable ignition performance. The use of premium materials such as iridium and platinum contributes to extended service life. While specific warranty details are not provided, Denso products typically adhere to manufacturer quality assurance protocols for automotive ignition components.