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Item Performance characteristics of diesel engine with bi-fuel using jatropha oil(UMT, Lahore, 2018) ZAIN ALI KHANThe expanding world population is getting industrialized rapidly with time. This results in an increased number of vehicles and sources of power generation. The increasing consumption of oil and decreasing resources causes a significant increase in the oil prize. The interests in exploration of alternative fuels are increasing with the rising oil prize. The major question for particular application is that which fuel can used as alternative fuel and what percentage of this fuel can be replaced with gasoline. A combination of available fuel and alternative fuels is the most likely choice in many cases. Wider applications of alternative fuels depend on economic, technological, and infrastructural issues. Jatropha is a tropical herb and can be matured in a diverse soil with low to high rainfall. The plant produces seeds containing inedible oil and can be acknowledged as a second-generation biofuel plant. It may provide a chunk of the fuel supply in the transportation and energy sectors. In the present work, Jatropha oil was squeezed from the seeds acquired from authorized dealer and changed to biodiesel by transesterification process. The important physical & chemical attributes of biodiesel were tested. The comparison of these properties for biodiesel and diesel oil shows approximately similar attributes and hence biodiesel is found quite feasible for usage in diesel engine. The biodiesel from jatropha oil is used in a single cylinder, four stroke diesel engine without any alteration in engine architecture or fuel scheme. The performance aspects of the diesel engine are examined in multiple proportions of biodiesel and diesel oil. The torque, and brake power of diesel engine using a mixture of 10% biodiesel and 90% diesel oil (J10D90) are found comparable with the torque and brake power of engine run on pure diesel oil. The torque and brake power of engine decreases with increasing percentage of biodiesel in the mixture. Similarly, the brake specific fuel consumption of diesel engine using a mixture of 10% biodiesel and 90% diesel oil (J10D90) is found comparable with the brake specific fuel consumption of engine run on pure diesel oil. The brake specific fuel consumption of engine then increases rapidly with increasing percentage of biodiesel in the mixture. The biodiesel blend J10D90 has shown optimum performance of diesel engine than any other blend.