MITSUBISHI S12R-MPTA 880 kW

The Mitsubishi S12R‑MPTA is a powerful and dependable heavy‑duty marine diesel engine engineered by Mitsubishi Heavy Industries for demanding propulsion applications in commercial and offshore vessels. With a rated output of 880 kW (approximately 1,180 HP), this 12‑cylinder, 4‑stroke, turbocharged and aftercooled engine delivers robust performance, high torque, and enduring reliability essential for continuous operation in challenging marine environments.

Built on Mitsubishi legacy of advanced diesel technology, the S12R‑MPTA features a rugged cast‑iron block and reinforced internal components designed for long service life, even under sustained heavy loading. Its turbocharger and charge‑air cooling system efficiently increase air intake and combustion efficiency, resulting in improved fuel economy and strong power delivery across a broad range of speeds. The precision fuel injection system ensures smooth combustion, responsive throttle behavior, and reduced specific fuel consumption — key attributes for efficient propulsion and optimal vessel performance.

The S12R‑MPTA heavy‑duty construction provides excellent vibration damping and mechanical balance, contributing to smoother operation and reduced wear over time. Its cooling and lubrication systems are engineered to maintain optimal temperature and oil quality during extended duty cycles, supporting operators in minimizing maintenance intervals and maximizing uptime.

Designed for seamless integration with marine gearboxes, control systems, and auxiliary components, the S12R‑MPTA is highly versatile and suitable for a variety of vessel types, including tugs, offshore support craft, ferries, and large workboats. Mitsubishi global parts and service network ensures accessible technical support and spare parts availability, giving operators confidence in long‑term performance and operational continuity.

Whether deployed for primary propulsion or heavy duty auxiliary power, the Mitsubishi S12R‑MPTA stands out as a high‑performance marine engine that combines power, durability, and efficiency — delivering the reliability and capability marine operators depend on in the toughest environments.

Technical Specifications

General Engine Data

Engine Model: Mitsubishi S12R‑MPTA
Type: 4‑stroke, water‑cooled, turbocharged and aftercooled diesel engine
Cylinders: 12‑in‑line
Displacement: ~33.93 liters (varies slightly by variant)
Bore × Stroke: 150 mm × 160 mm
Compression Ratio: Approx. 14.5 : 1
Fuel System: Direct fuel injection (mechanical or electronic depending on spec)
Rated Output: 880 kW (≈ 1,180 HP)
Rated Speed: Typically ~1800–2000 RPM (depends on installation)
Rotation: Typically counter‑clockwise (flywheel end)
Mounting: Marine engine mounts

Performance

Power: 880 kW at rated RPM
Torque: High torque output optimized for efficient marine propulsion
Duty: Continuous heavy‑duty operation
Designed for stable performance under full load

Cooling & Lubrication

Cooling System: Jacket water system with heat exchanger for seawater cooling
Charge‑Air Cooling: Air cooler / intercooler integrated for improved combustion efficiency
Lubrication: Full‐flow oil filtration with oil cooler
Oil Capacity: Large sump designed for extended service intervals

Physical Dimensions & Weight

Approx. Dry Weight: ~3,700 – 4,100 kg (without ancillaries)
Approx. Dimensions: ~2,600 mm (L) × 1,650 mm (W) × 1,600 mm (H)
Actual size and weight vary depending on accessories and configuration

Systems & Features

Turbocharger: High‑efficiency single turbocharger
Fuel Delivery: Precision injection for smooth combustion and fuel economy
Cooling Water Pump: Belt driven seawater & jacket water pumps
Starter: 24 V electric
Control & Monitoring: Engine mounted sensors integrated for marine instrumentation

Typical Applications

Marine Propulsion: Tugs, offshore support vessels, ferries, workboats
Auxiliary Power: Heavy‑duty onboard power generation
Industrial Drives: Pumps and compressors (depending on configuration)

Key Advantages

Robust construction: Heavy‑duty block and internals for long service life
Efficient performance: Turbocharged & aftercooled design for strong power and fuel economy
Continuous duty capability: Stable output under extended load
Global support: Mitsubishi parts and service network worldwide

Mitsubishi S12R-MPTA

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