Performance and exhaust emission studies of Waste Chicken Oil Methyl Ester (WCOME)-diesel fuel blends has been presented in this paper. The production of biodiesel from waste chicken oil was carried out via transesterification method. Blending ratios were preferred as 5% (B5), 10% (B10), 25% (B25) and 50% (B50) respectively. Performance and emission studies were carried out in a commercial diesel engine. The performance results reveal that blends of WCOME with diesel fuel provide increase on the brake specific fuel consumption (bsfc) and decrease on the brake power output proportional to the reduction in the heating value of blends. As a result, while the carbon monoxide (CO) and the carbon dioxide (CO2) emissions were reduced, nitrogen oxides (NOx) emissions were stated higher compared with the diesel fuel emission characteristics.

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