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Maritime Propulsion

November 27, 2023

MAN Unveils Dual-fuel Methanol 175D Engine

The MAN 175D engine will be available both as newbuild and retrofit variants – designated MAN 175DF-M – from end-2026. (Image: MAN Energy Solutions)

MAN Energy Solutions has unveiled a dual-fuel version of its MAN 175D high-speed engine, capable of operating on methanol, that's scheduled to become available to the market by the end of 2026. The new variant, designated MAN 175DF-M, will be available both as newbuild and retrofit variants.

MAN Energy Solutions states that the 175DF-M will be optimized for diesel-mechanical and diesel-electric propulsion to achieve the largest methanol share and best efficiency for various applications and load profiles. The engine has already been awarded the ‘fuel ready’ certificate by DNV.

Florian Keiler, Head of High Speed, MAN Energy Solutions, said, “The MAN 175D has proven to be very competitive in terms of sustainability and efficiency with the lowest fuel consumption, lowest lube-oil consumption and longest overhaul times in its class, minimizing its environmental footprint. In terms of future fuels, the next logical step, apart from being able to run on 100% bio-fuels, is to ensure methanol combustion.”

MAN Energy Solutions is developing a methanol-ready engine portfolio as the demand for such technology has rapidly been increasing. With its success in achieving series-approval for its two-stroke engines, MAN Energy Solutions has used this experience to develop an optimized solution for its four-stroke engines, including successful single-cylinder testing. As such, the results of these efforts will fuel the upcoming development and validation of the dual-fuel PFI (Port Fuel Injection) technology for its methanol-ready 175D engine.

Keiler said, “Based on numerous exchanges with customers, we came to the conclusion that the dual-fuel principle, reliability, efficiency, a high methanol share, competitive life-cycle costs and maximum achievable output were key requirements for the 175DF-M’s development. Therefore, after conscientious investigation and consideration, we settled upon the PFI combustion technology as the most favourable. Fundamental combustion development will start in 2024, leading up to a first field-test of the methanol engine in 2026. The MAN 175DF-M engine will subsequently be ready for sales release at the end of 2026.”