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Researchers in South Korea have developed a 2-liter direct injection hydrogen engine for passenger cars, claiming it’s more economical and eco-friendly than conventional internal-combustion engines that use hydrogen. This new technology injects high-pressure hydrogen directly into the combustion chamber, resulting in ultra-lean combustion and low NOx emissions. The engine also achieves a high thermal efficiency of up to 40%, reducing carbon dioxide and fine dust emissions by 98% and 90%, respectively, compared to gasoline engines. Researchers aim to test the engine’s durability and explore its potential for various vehicle types and electricity generation power units.