In this study, bio-butanol soluble in bunker A is examined to use as a marine diesel fuel. The effects of 1-butanol blending ratio to bunker A on the fuel properties, ignitability, combustion characteristics and exhaust emissions are investigated using a single cylinder DI diesel engine. The blending ratio of 1-butanol is varied from 10 mass% to 40 mass%. The experimental results show the ignition delay of the blended fuel becomes longer and the HC and CO emissions increase especially at low load conditions with the 1-butanol content. With 30 mass% 1-butanol blends, the thermal efficiency of 1-butanol blend is almost the same as that of bunker A and the smoke emission reduces by about 50 % at full load condition.
