Received: Jun 25, 2024 / Accepted: Jan 25, 2025 / Published: Mar 31, 2025
One of the main issues in using hydrogen as an alternative fuel for gasoline engines is the need to optimize the fuel supply system and adjust the air-fuel ratio to ensure a stable and efficient combustion process. This process should ensure complete combustion and avoid backfire or explosions in hydrogen engines, while also addressing the engine's efficiency when using pure hydrogen fuel. Single-cylinder, small-capacity gasoline engines are widely used in Vietnam. Using hydrogen fuel as a substitute for gasoline in these engines is still in the research phase and has not been widely implemented. This paper introduces a test model and experimental research results on the characteristics of a Honda Wave 100cc engine, which was modified to use hydrogen fuel. At an injection pressure of 2.5 bar, the torque and power varied according to different throttle levels of 50%, 75%, and 100%. The maximum torque of the hydrogen engine reached 7.3Nm at an engine speed of 5500rpm, and the maximum power reached 4.6kW at an engine speed of 6200rpm, with a minimum specific fuel consumption of about 110 g kWh-1. The experimental results showed that the maximum power of the hydrogen engine was about 70%, and the maximum torque was about 84% of that of gasoline engines. These initial research results provide a foundation for the simple conversion of traditional vehicles in Vietnam to hydrogen fuel, without requiring significant structural changes to the engine
