Yanmar Power Technology Co., Ltd., a group company of Yanmar Holdings Co., Ltd., has successfully completed a land-based demonstration test of a pilot-ignition H₂ 4-stroke high-speed engine for power generation in coastal vessels, achieving operation at a rated output of approximately 500 kW. This trial was conducted as part of the Nippon Foundation’s zero emission ship demonstration experiment.

The tested pilot-ignition H₂ engine operates by using a small amount of diesel oil as the ignition source (pilot fuel) to burn a premixture of H₂ and air. With this operation, the engine achieved the world’s highest H₂ fuel ratio and an output of approximately 500 kW, leading the industry (according to Yanmar’s research).

Going forward, Yanmar Power Technology plans to continue zero-emission trials using biofuel as the pilot fuel, while also working towards obtaining class certification for demonstration operations scheduled for 2026.