Impact of oxy-hydrogen enriched gasoline on petrol engine performance and emissions

Blending oxy-hydrogen (HHO gas) with gasoline is promising to reduce emissions and improve engine performance. In this scenario, this study conducts several experiments on different configurations to produce the highest HHO gas yield mixed with gasoline and tested at different engine speeds. The design 8C8A4N is chosen due to its high HHO gas output, low current consumption, and low electrolyte concentration. At an electric current of 15 and 28 A, the dry cell of 20 plates could yield 250 – 500 mL min⁻¹. The specific fuel consumption, output power, torque, air–fuel ratio, air–fuel equivalence ratio, NO_X, HC, CO, and CO₂ emissions were measured and discussed. A comparative study of performance and emissions is conducted to demonstrate the impact of HHO on light vehicles. The maximum improvements in brake power and brake torque relative to gasoline at engine speeds from 3500 to 5300 rpm are measured to be 16.52 and 12.89%, respectively, at an HHO gas flow rate of 0.5 L min⁻¹. In comparison to pure gasoline at the engine speed range, the highest reductions in specific fuel consumption, CO, CO₂, NOx, and HC emissions are 39.92, 33.86, 26.42, 19.43, and 26%, respectively. Therefore, the HHO blended gasoline is promising for both thermal performance and economic impacts.