The Cummins QSB6.7 480 HP Marine Diesel Engine is a robust, high-performance engine designed for marine applications. This engine combines advanced engineering with high power output, making it an ideal choice for vessels requiring a balance between power, fuel efficiency, and environmental compliance. Below is a detailed description of the Cummins QSB6.7 480 HP Marine Diesel Engine:

Key Features:

1. Engine Configuration:
   • Type: Inline 6-cylinder, 4-stroke diesel engine.
   • Displacement: 6.7 liters (409 cubic inches).
   • Bore x Stroke: 104 mm x 132 mm (4.09 inches x 5.20 inches).
   • Aspiration: Turbocharged with intercooling for enhanced air intake and combustion efficiency.
2. Power Output:
   • Rated Power: 480 horsepower (hp) at 2,600 RPM.
   • Maximum Torque: Approximately 1,680 Nm (1,240 lb-ft) at 1,400 RPM.
   • Designed to provide a high power-to-weight ratio for faster acceleration and reliable cruising at sea.
3. Fuel System:
   • Fuel Type: Diesel, optimized for marine applications.
   • Fuel Delivery System: Common rail fuel injection technology for improved combustion efficiency, reduced emissions, and enhanced fuel economy.
   • Fuel Efficiency: The engine is designed for excellent fuel economy, making it cost-effective for long voyages.
4. Cooling System:
   • The QSB6.7 features an advanced cooling system with a fresh-water-based cooling system and a seawater-cooling loop for the heat exchangers. This ensures that the engine maintains optimal temperatures, even in hot conditions or high-stress operation.
5. Exhaust System:
   • The engine is fitted with a cooled EGR (Exhaust Gas Recirculation) system and a selective catalytic reduction (SCR) system to meet stringent emissions standards, including EPA Tier 3, IMO, and EU RCD emissions regulations.
   • A marine-grade dry exhaust system ensures better reliability in the harsh marine environment.
6. Turbocharging and Intercooling:
   • The engine features a turbocharger and intercooler system that significantly enhances its performance. The turbocharger increases air intake efficiency, which helps to produce more power, while the intercooler reduces the temperature of the compressed air entering the engine for better combustion efficiency and reduced engine knock.
7. Lubrication:
   • The QSB6.7 employs a wet sump lubrication system, ensuring consistent oil pressure and cooling, reducing wear on the engine components for long service life.
8. Control and Monitoring:
   • Electronic Control Module (ECM): The engine is equipped with advanced ECM technology that provides precise control over engine performance, diagnostics, and monitoring. The ECM allows for efficient power delivery and ensures the engine operates within optimal parameters.
   • Marine-Grade Display/Controls: Compatible with various marine electronic displays, providing real-time data on engine health, performance, fuel efficiency, and diagnostics.
9. Dimensions and Weight:
   • Length x Width x Height: Approximately 1,078 mm x 789 mm x 1,053 mm (42.4 inches x 31 inches x 41.5 inches).
   • Weight: Approximately 1,050 kg (2,315 lbs) depending on configuration and optional accessories.
10. Noise and Vibration Reduction:
    • Designed with noise and vibration reduction technologies to enhance the comfort of crew and passengers, especially in recreational vessels or passenger ships.
11. Maintenance:
    • The QSB6.7 features a simplified maintenance process, with accessible components and long service intervals. This reduces downtime and maintenance costs.
    • Equipped with Cummins’ advanced filtration systems to extend the lifespan of engine components and maintain optimal performance.
12. Environmental Considerations:
    • The engine meets EPA Tier 3, IMO, and EU RCD regulations, ensuring it is environmentally compliant for marine operation.
    • Advanced after-treatment systems, including SCR and EGR, reduce nitrogen oxide (NOx) and particulate matter emissions.

Applications:

The Cummins QSB6.7 480 HP is designed for a wide range of marine applications, including:

• Pleasure Craft/Boats: Offers sufficient power for high-speed cruising and reliable performance for recreational vessels.
• Commercial Vessels: Suitable for light-duty commercial workboats, passenger vessels, and utility boats.
• Fishing Boats: Delivers the necessary power for the demanding needs of fishing vessels, both for propulsion and auxiliary applications.
• Specialized Marine Equipment: Can be used in other applications like offshore support vessels, tenders, and service vessels.

Performance Benefits:

• Power and Durability: Delivers high power with exceptional reliability, capable of operating under demanding marine conditions.
• Efficiency: The engine’s advanced fuel management and turbocharging systems provide excellent fuel efficiency and extended range for long voyages.
• Environmental Compliance: Meets current emission regulations, making it suitable for global use while reducing the environmental impact of marine operations.

Summary:

The Cummins QSB6.7 480 HP Marine Diesel Engine offers an ideal balance of power, performance, fuel economy, and environmental compliance for modern marine applications. It is engineered to provide a long service life with reduced emissions and lower operating costs, making it an excellent choice for both commercial and recreational vessels. Its robust design, high-efficiency turbocharging, and integrated control systems ensure reliability and optimal performance in challenging marine environments