Effect of the Blends of Diesel and Biodiesel Made From Waste Cooking Oil on Compression-Ignition Engine (CI) Performance

Today biodiesel is has known as an alternative to diesel fuel. It is mainly produced from different kinds of vegetable oils. Regarding the high cost of biodiesel made from edible vegetable oils, the waste cooking oils and inedible oils are preferred as low cost potential for biodiesel production. Therefore in this research work, first the biodiesel was produced from waste restaurant oil using transesterification reaction. Then the main characteristics of produced fuel were compared with the ASTM D-6751 standard. With confidence from standardization of the produced biodiesel, the changes in the performance of 6 cylinder Perkins engine was investigated using the blends of biodiesel and diesel fuel at full load. Test results showed that by adding the biodiesel to diesel fuel, due to complete combustion, the power and torque of the engine increases. With regard to the low caloric value of the biodiesel, the specific fuel consumption also slightly increases. The qualitative observations showed that the rate of odor and smoke decreases and the change in odor at high ratios of biodiesel is completely evident. Generally it was found that by adding 25 percent biodiesel made from the waste oil to the diesel fuel, without any change and modification, the engine performance is improved.