In the following an experimental investigation on a single-cylinder four-stroke spark ignition engine
operating with gasoline was performed to study the effect of hydrogen addition to fuel on its performance
and emissions. The hydrogen was inducted in the air inlet manifold with different volume ratios
24%, 26%, 27%, 28%, 29%, 31%, 35%, 37%, 49% of total intake volume. The combustion analysis was carried
out for different percentage of hydrogen additions. The results show that due to the rapid rate of burning
of gasoline-air mixture with the addition of hydrogen leads to increase in cylinder pressure. The engine
test performance shows an improvement in thermal efficiency as well as reduction in brake specific fuel
consumption. The emission analysis shows a reduction in unburned hydrocarbon (HC) and carbon
monoxide (CO). Finally, using hydrogen blended with gasoline showed an improvement in efficiency
and environmental benefit.