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Strong and smart: Four-stroke propulsion engines

In times when there is a great need for more intelligent fuel use in marine applications and flexible propulsion systems, MAN Energy Solutions is facing the challenge of meeting environmental standards without sacrificing propulsion efficiency and ship performance.
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Full range of MAN four-stroke propulsion engines

Explore the capabilities and range of our four-stroke propulsion engines.

High power combined with high efficiency: Our four-stroke propulsion engines

MAN L+V51/60DF propulsion

Let your fuel take you further! By combining diesel and gas technologies in one engine, the MAN 51/60DF provides optimum fuel flexibility. There is no better way to keep your engine running effectively and economically.

  • High-efficient variant/high-power
    variant 500 – 514 rpm/500 – 514 rpm
  • 6,300 – 16,800 kW/6,900 – 16,100 kW

MAN V51/60DF - high power

MAN V51/60DF - high efficiency

MAN L51/60DF - high efficiency

MAN L+V49/60DF propulsion

The MAN 49/60DF is future-proof in multiple ways. Its benchmark fuel efficiency guarantees competitive vessel operation. The very low level of methane emissions ensures long-term CO2 emission compliance.

  • 600 rpm
  • 7,800 – 18,200kW
  • At 600 rpm: 1,300kW
  • Power-to-weight ratio: 13.5 – 16.7 kg/kW
  • Gas mode: 6,990 kJ/kWh

MAN L+V49/60 propulsion

The MAN 49/60 is part of MAN’s new future-proof 49/60 engine flagship family with lowest emissions thanks to its new MAN common rail injection system. As it is a Methanol-ready engine, it can be upgraded at a later stage to full methanol operation.

  • 600 rpm
  • 7,800 – 18,200kW
  • At 600 rpm: 1,300kW
  • Power-to-weight ratio: 13.5 – 16.7 kg/kW

The MAN L+V48/60CR injection system uses the latest MAN Energy Solutions common rail technology, allowing for flexible setting of injection timing, duration, and pressure for each cylinder.

  • 500 – 514 rpm
  • 7,200 –19,200 kW

MAN L35/44DF propulsion

The MAN L35/44DF offers high output, dual fuel flexibility, and Tier II and Tier III compliance. It is ideal for mechanical propulsion, electric propulsion as well as auxiliary GenSet applications

  • 720 – 750 rpm
  • 3,060 – 5,300 kW

By using MAN’s common rail system, high-efficiency turbochargers, variable valve timing and state-of-the-art control systems, the MAN L+V 32/44CR is a synthesis of the most advanced large-engine technologies available.

  • 720 – 750 rpm
  • 3,600 – 12,000 kW

MAN L+V32/40 propulsion

Efficient, clean, and compact: The “32/40 Workhorse” is in service 24 hours a day. With a power output range of 3,000 to 9,000 kW, it is ideal for small and medium sized propulsion applications.

  • 720 – 750 rpm
  • 3,000 – 9,000 kW

Efficient, clean, compact, and yet powerful, the MAN 28/33D STC represents the synthesis of world-class engineering and state-of-the-art technology for your marine propulsion and power needs. Especially popular in fast ferry and naval applications.

  • 1,000 – 1,032 rpm
  • 5,460 – 10,000 kW

MAN L27/38 propulsion

The MAN L27/38 engine is the ideal power source in the 2,100 — 3,060 kW output range for small to medium-sized tankers, cargo vessels, ferries, passenger, RO-RO vessels, coasters, large fishing vessels, tugs, workboats, and supply vessels.

  • 750 – 800 rpm
  • 2,100 – 3,060 kW 

MAN L21/31 propulsion

The MAN L21/31 engine is the ideal power source in the 1,290 – 1,935 kW output range for small to medium sized tankers, cargo vessels, ferries, RO-RO vessels, fishing vessels, tugs, workboats, and supply vessels.

  • 1,000 rpm
  • 1,290 – 1,935 kW

Packing the latest state-of-the-art technology into a minimum volume, the MAN 175D is characterized by clear-cut design. It is innovatively designed to be the most efficient engine for every application – from heavy duty to light duty

  • 1,800 - 2,000 rpm
  • 1,740 – 4,400 kW

The proven Pielstick PC2.6B design delivers high power density, low emission levels, and reduced running costs in various diesel-electric propulsion configurations.

  • 600 rpm
  • 9,000 – 13,500 kW


The Pielstick PA6 B STC is a compact, lightweight, and durable engine with performance characteristics attractive for military and civil applications.

  • 1,050 – 1,084 rpm
  • 4,860 – 8,910 kW 

MAN four-stroke propulsion engine programme

Efficient, compact, and powerful: Propulsion engines for your needs

A characteristic feature of MAN marine engines is their powerful acceleration coupled with an extremely low fuel consumption. Their advantages are to be found above all in their outstanding power efficiency and compactness. The engines are delivered ready for installation and are designed for optimum performance in the various conditions of deployment and operation. All engines comply with the internationally applicable exhaust gas regulations.

Service solutions for optimum efficiency

MAN PrimeServ offers advanced modernization solutions to optimize your existing equipment. Furthermore, MAN’s modernization and retrofit solutions are tailor-made to customers’ specific applications and machinery.


Go to MAN PrimeServ
Up t0
Output per cylinder: MAN 51/60DF – the dual fuel engine with the highest power output
A minimum of
Time between overhauls for the L27/38
Best power-to-weight ratio in its class 5.2 kg/kW: MAN 28/33D STC – the engine with the best power-to-weight ratio in its class

Reference example

Customer:TT-Line Germany
Application:1+1 RoPax Ferry (passenger/vehicle)
Location:Jingling Shipyard, China
Fuel:Dual fuel (LNG & MGO)
MAN's work scope:Engines, gearbox, CPP: 2 x 8L51/60DF, 2 x 6L51/60DF, 2 x  twin-in/single-out gearbox, MAN ES Alpha twin screw CPP


Electrical system: AKA incl. advanced HyProp ECO system, 2  x shaft alternator, 3 x electric motor for bow thruster, 2 x  frequency converter, 1 x bow thruster starter unit, 3 x  transformer, 2 x UPS


Fuel gas supply system: MAN ES Cryo incl. 2 x 500mvacuum-insulated tank


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