Edible oils are receiving a lot of attention as an alternative fuel for engines as they are renewable and can be used in engines without any major modification. Their properties are closer to those of diesel except viscosity. The main problems of using corn oil in diesel engines are higher emission level and lower thermal efficiency due to higher viscosity and carbon residue compared to diesel. Transesterification of corn oil into biodiesel is the best method to overcome this problem. In the present study we are using corn biodiesel in different blends such as COME10, COME20, COME30, &COME100...