MITSUBISHI S12A2‑C2MPTA (634 kW, 1940 RPM)

The MITSUBISHI S12A2-C2MPTA is a high-performance, turbocharged marine diesel engine engineered for demanding propulsion applications that require exceptional power, durability, and operational efficiency. Rated at 634 kW (approximately 850 HP) at 1940 RPM, this 12-cylinder inline engine delivers robust performance suitable for larger commercial vessels such as ferries, offshore workboats, tugboats, survey ships, and other high-power craft operating in challenging marine environments.

Built by Mitsubishi Heavy Industries, the S12A2-C2MPTA combines advanced engine design with a heavy-duty construction that ensures long service life and reliable continuous operation. With a turbocharger and intercooler system, the engine maximizes air delivery into the combustion chambers for efficient fuel combustion, improved thermal efficiency, and high power output across a broad operating range. Its sophisticated fuel injection system promotes stable performance, excellent throttle response, and reduced specific fuel consumption — making it ideal for applications where efficiency and reliability are paramount.

The 12-cylinder, inline configuration enhances mechanical balance and smooth operation while generating substantial torque to handle high propulsion loads. Mitsubishi’s water-cooling system maintains optimal engine temperature even under sustained high-load conditions, and the robust cast iron block and cylinder heads provide exceptional strength to withstand continuous maritime use.

Designed for integration with marine gearboxes, control systems, and propulsion drives, the S12A2-C2MPTA engine supports flexible installation options and seamless integration with vessel systems. Comprehensive after-sales support and global parts availability from Mitsubishi’s network ensure easy maintenance and dependable service throughout the engine’s operational life.

Whether deployed for commercial shipping, offshore support, or heavy-duty marine propulsion, the MITSUBISHI S12A2-C2MPTA offers a powerful and efficient solution backed by proven engineering and performance that marine operators trust for demanding maritime missions.

Technical Specifications

General Engine Data

• Engine Model: S12A2-C2MPTA (Heavy Duty Marine)

• Configuration: 12-cylinder, 60° V-type diesel

• Cycle: 4-stroke, water-cooled

• Aspiration: Turbocharged with after-cooler

• Bore × Stroke: 150 mm × 160 mm

• Total Displacement: 33.93 liters (2071 in³)

• Compression Ratio: ~14.5 : 1

• Dry Weight: ~3,800 kg (engine only)

• Dimensions: Approximately 260 × 165 × 160 cm (L × W × H)

• Cylinder Arrangement: V12, 60° angle

Performance (Propulsion)

• Rated Power: 634 kW (~850 HP) at 1940 RPM

• Mean Piston Speed: ~10.3 m/s

• Brake Mean Effective Pressure: ~1.16 MPa

• Maximum No-Load Governing Speed: ~2086 RPM

• Maximum Overspeed Capacity: ~2400 RPM

• Intake Air Flow: ~62 m³/min

• Exhaust Gas Flow: ~164 m³/min

• Coolant Flow: ~1,160 L/min

• Coolant Pressure (pump outlet): ~0.19 MPa

• Oil Flow: ~400 L/min

Systems & Operation

• Cooling System: Separate jacket water and intercooler circuits with thermostatic control

• Fuel System: Direct injection with high-pressure fuel pump

• Lubrication: Full-flow and bypass filters with large-capacity oil pan

• Starter: DC 24 V system

• Alternator: DC 24 V charging

• Accessory Drive: Front-mounted pulley system

Air & Exhaust

• Maximum Allowable Intake Air Restriction: ~3.92 kPa

• Maximum Allowable Intake Air Temp: ~45 °C

• Maximum Exhaust Back Pressure: ~4.41 kPa

Mounting & Structural

• Engine Mounting: Marine type supports

• Maximum Bending Moment (rear face of flywheel housing): ~1961 N·m

Typical Applications

Designed for heavy-duty marine propulsion, this engine is suitable for medium-large vessels, including tugs, offshore support craft, coastal ferries, and other workboats requiring continuous high-power output.