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MAN launches new dual-fuel engine

MAN Energy Solutions has launched its MAN 49/60DF engine type at the SMM trade fair in Hamburg. The latest addition to its four-stroke engine portfolio, the dual-fuel engine is capable of running on LNG, diesel and HFO as well as a number of more sustainable fuels including biofuel blends and synthetic natural gas.

MAN Energy Solutions states that it sets a benchmark in terms of fuel efficiency within four-stroke engines—both in gas and diesel modes—and therefore minimizes fuel costs.


The MAN 49/60DF is making its debut at a time where—while the number of LNG projects is still growing—alternative fuels like methanol, ammonia and hydrogen are continuing their rise, albeit with none having established market dominance as of yet. Increasingly, it is crucial for new vessels to be driven by engines that provide options for emission compliancy over the vessel’s lifetime. Fuel flexibility and efficiency are the key features. In this respect, the 49/60DF distinguishes itself by offering a number of various emission paths. It also has a level of efficiency that ensures best fuel costs in many applications, especially within the cruise, RoPax, RoRo, dredger, and LNG carrier segments.

—Marita Krems, Head of Four-Stroke Marine & License, MAN Energy Solutions

The 49/60DF is available for order and is based on the new 49/60 engine platform that features MAN’s latest technologies, including two-stage turbocharging, second-generation common-rail fuel injection, SaCoS5000 automation system and MAN’s next generation Adaptive Combustion Control ACC 2.0 that automatically sets combustion to optimum levels.

The engine also retains existing MAN technolgies such as the gas-injection system, pilot-fuel-oil system and MAN SCR (Selective Catalytic Reduction) system.

The 49/60 can start in gas mode where it complies with IMO Tier III without secondary measures. In diesel mode, it complies with Tier III combined with MAN’s SCR system.

Soot emissions are halved in diesel mode due to MAN’s new common rail system 2.2, while the 49/60DF’s methane emissions also significantly reduced in gas mode compared to its predecessor. The engine’s benchmark efficiency and fuel-flexible design offers multiple paths to emission compliancy leading up to 2050, as per the current Fuel EU draft.

MAN Energy Solutions plans to introduce a pure diesel engine based on the 49/60 platform in 2023 that will inherently be retrofit-ready for running on methanol and LNG should the demand arise at a later stage.

MAN 49/60DF specifications

Bore/stroke (mm) 490/600
Cylinder distance (mm) L: 820; V: 980
Cylinder configuration 6L, 7L, 8L, 9L, 10L, 12V, 14V
rpm (min -1) 600
Power output per cyl. (kWm) 1,300
Power range (kW m ) L: 7,800 - 13,000; V: 15,600 - 18,200
Marine applications DM (CPP), DE (constant and variable speed)
SFC in gas mode
(kJ/kWh) @ 85% load
(8L, 10L: 7.010)
SFOC in diesel mode
(g/kWh) 85% load
(8L, 10L: 172.0)
Emissions gas mode: IMO Tier III;
diesel mode: IMO Tier II without SCR, Tier III with SCR


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