Japan’s Japan Engine Corporation (J-ENG) has set a precedent in shipping with the unveiling of the first full-size commercial ammonia-fueled engine. The model, identified as 7UEC50LSJA-HPSCR, was completed on August 30, 2025, and underwent rigorous testing between August 27 and 30, 2025.
Commercial ammonia engine passes key tests
During the test days, the engine demonstrated outstanding performance in both ammonia combustion mode and dual mode with heavy fuel oil. The tests were overseen by key industry institutions: Nippon Yusen Kaisha (NYK Line), Nihon Shipyard (NSY), Japan Marine United Corporation (JMU) and the ClassNK classification society, which validated its safety and environmental efficiency levels.
The engine achieves a 95% ammonia co-combustion rate and a greater than 90% reduction of greenhouse gases through its nitrous oxide emissions. nitrous oxide (N₂O) emissions (N₂O) emissions close to 3 ppm. In addition, nitrogen oxide (NOx) emissions are reduced by half compared to traditional engines, and the high-pressure SCR system almost completely eliminates unburned ammonia.
Technology expansion and decarbonization goals
The engine will be installed on an AFMGC vessel under construction at JMU Ariake shipyard and is expected to enter service by 2026. This breakthrough is part of the national project “Next Generation Ship Development” funded by NEDO’s Green Innovation Fund.
J-ENG is developing a second 60 cm diameter engine to expand its offering to other types of ammonia-powered vessels. ammonia-powered vessels. To support this technology line, the company is building a new production plant, scheduled for 2028, with state support through GX Economic Transition Bonds.
As a pioneering player in alternative-fuel propulsion systems alternative fuel propulsion systemsJ-ENG seeks to lead the early adoption of clean technologies in the maritime sector. The introduction of ammonia engines represents a significant step towards the carbon neutrality that is projected to be achieved by 2050.
Source and photo: Japan Engine Corporation
