In this study, biodiesel was produced from safflower oil by transesterificaion
method. A blend of 80% biodiesel and 20% petroleum diesel fuels called here as
B80 was used in a four strokes, direct injection and air cooled diesel engine in order
to clarify biodiesel emission as compared with standard diesel fuel. As the test fuels
were compared, B80 fuel was resulted in lower HC, CO2, and CO emissions while
it was resulted in higher NOx and O2 emissions than petroleum diesel fuel. It was
concluded that biodiesel fuel has lower hazardous effects on environment that those
of fossil based fuels.