The Korea Institute of Machinery and Materials (KIMM), in partnership with Hyundai Motor and Kia, has introduced a groundbreaking 2-liter engine powered by ammonia, a renewable and zero-carbon energy source. This innovative technology, capable of directly injecting ammonia into the combustion chamber at high pressure, aims to revolutionize power systems for vehicles, ships, aircraft, and industrial power generators. By utilizing high-pressure liquid injection technology, the engine addresses issues related to gaseous ammonia fuels, ensuring stable power output and reducing harmful emissions. The research team at KIMM enhanced the engine's performance by refining the ignition system, optimizing fuel injection timing, and developing an after-treatment system to minimize emissions. Dr. Cheolwoong Park emphasized the engine's potential to revolutionize clean energy sources in mobility and industrial power generation sectors. Dr. Seungwoo Lee of Hyundai Motor and Kia highlighted the engine's significance in overcoming challenges related to hydrogen transportation and green hydrogen production. Supported by Hyundai Motor and Kia, this project showcases the advancement of ammonia as a viable fuel option, promising improved thermal efficiency, power output, and reduced emissions. The development of this 2-liter ammonia-fueled engine signifies a remarkable leap forward in power system technology, introducing a sustainable and efficient solution for various applications.