The textbook presents a brief outline of the basic engineering in performance test of diesel engine using ethanol-diesel fuel blends. The study has been taken from the point of view of introduction, literature review, experimental work, conclusions and recommendations. Ethanol is an alternative energy source. It is alcohol made by fermenting corn other similar biomass material. Ethanol in its liquid form, called, ethyl alcohol, can be used as a fuel when blends with diesel, or gasoline or in its original state. It can also be used as a raw material in various industrial processes. Ethanol is...