MAN ES launches four-stroke DF engine

With its eye on future fuel flexibility, MAN Energy Solutions has unveiled a new four-stroke, dual-fuel auxiliary engine that is capable of slashing methane slip by up to 85% when operating on LNG and is ready for methanol.

Developed in co-operation with South Korean engine builder STX Engine and solely for production by MAN ES licensees, the MAN 35/44DF CD engine was designed for use in container and LNG carrier applications.

Based on the well-proven MAN 35/44DF CR and MAN 32/44CR platforms, which have logged millions of running hours, the new genset engine was developed with the goal of cutting down capex and opex. As a result, the MAN 35/44DF CD is more efficient and more powerful. Methane slip is reduced by up to 85% compared with market standards, according to the Danish engine designer. Methane is a powerful greenhouse gas, with a global warming potential of 27 to 30 over a 100-year period, according to the US EPA.

Additionally, the engine has the highest power output in segment with 560 kW per cylinder. This allows for fewer cylinders or even engines for same power output per vessel, said MAN ES.

MAN ES expects the first engine delivery by mid-2024, with the first unit in commercial operation from 2025.

Among the other benefits of the MAN 35/44DF CD cited by the engine designer are its full digitalisation and connectivity with state-of-the-art cyber security, compact footprint with multiple layout options for engineroom flexibility, and fuel flexibility, including biofuels, gas and also future-fuel methanol-ready.