China Yuchai International Limited, one of the largest powertrain solution manufacturers through its main operating subsidiary in China, Guangxi Yuchai Machinery Company Limited (Yuchai), has introduced its first high-pressure, direct-injection internal combustion engine capable of operating entirely on ammonia and designed for heavy–duty commercial vehicles.

This is a historic breakthrough for Yuchai in its low- and zero-carbon power research initiatives in hydrogen-, methanol-, and now, ammonia-based propulsion. This milestone validates and operationalizes key technologies; specifically, the integration of a high-pressure ammonia-to-hydrogen generation system with the high-pressure direct injection of liquid ammonia ignited via a pre-chamber jet.

With a thermal efficiency on par with the highest levels of heavy-duty diesel engines, this technology delivers a new zero-carbon power solution for heavy-duty, long-haul commercial vehicles. This innovation effectively balances the advantages of low total lifecycle costs with the need to reduce carbon emissions, facilitating the transition from traditional internal combustion engines toward a sustainable, zero-carbon future.

Weng Ming Hoh, President of China Yuchai International, commented, "This breakthrough meaningfully broadens our technology foundation and the next-generation power solutions we provide, unlocking significant potential for carbon reductions. Building on this momentum, Yuchai will further strengthen its innovative R&D capabilities in ammonia–energy applications, reinforcing our commitment to helping China achieve its 'Dual Carbon' strategic goals."