Scientists retrofit diesel engines to use hydrogen as fuel, increasing efficiency 26%Engineers at the University of New South Wales (UNSW) have successfully retrofitted a diesel engine to use hydrogen as a fuel to reduce carbon emissions, TechXplore reported.Electrified transport has been getting a greater push in recent months, with states and countries banning the sales of internal combustion engine-powered vehicles in the next decade.The research effort led by Shawn Kook, a professor at the School of Mechanical and Manufacturing Engineering, has demonstrated to have reduced carbon dioxide emissions to 90 g/ kWh, which is about 86 percent lower than that produced by a diesel-powered engine.The engine was operated at a constant speed of 2000 revolutions per minute and fixed combustion phasing of −10 crank angle degrees before top dead centre (°CA bTDC) while evaluating the power output, efficiency, combustion and engine-out emissions.To keep the NOx increase minimal and achieve the same combustion phasing of a diesel baseline, the 40 °CA bTDC hydrogen injection timing shows the best performance at which 85.9% CO2 reduction and 13.3% IMEP/efficiency increase are achieved."