<![CDATA[Problems oil reserves are dwindling caused the crisis, the effects of the crisis has been felt in the last few years. It encourages researchers to participate in developing renewable fuels. This study, try blend Biosolar Pertamina with jatropha biodiesel. The purpose of this study was to determine the effect of the composition of jatropha into Pertamina Biosolar to volumetric efficiency of direct injection diesel engine 4- stroke, 4-cylinder with a cylinder volume is 2.8 liters. The composition of the fuel for the experiment is D100 ( Biosolar Pertamina 100% ) ; D90J10 ( Biosolar 90% Jatropha 10%) ; D80J20 ( Biosolar Pertamina 80% Jatropha 20%) dan D70J30 ( Biosolar 70% Jatropha 30% ). The method used is experiment. Results of the study are (1) Effect increase the percentage of biodiesel jatropha to engine diesel power is the power at all loads to be decreased. Values drop in brake power at each of the largest load variation occurs in the mixture D70J30 with a value decline of 0.75%, 5.28%, 10.37% and 9.85% of the power with fuel D100. (2) Effects of jatropha biodiesel percentage increase also resulted in torque at all loads going down. the lowest decline in every variation is incurred on fuel D70J30 brake power is calculated from the value D100, with a value decline of 0.74%, 5.02%, 9.40%, and 8.96%. (3) Effect throughout the fuel mixture of the volumetric efficiency of diesel engines is causing decreased volumetric efficiency, the biggest decline was 6.33%, 6.61%, 6.33%, and 6.19% in the fuel D80J20 volumetric efficiency is calculated from the value D100. Suggested solutions to overcome the problems of a decrease in volumetric efficiency is by placing the intake valve settings, so that when air intake into the cylinders could be longer and with the modification that with the addition of a supercharger or turbocharger, more preferably also added intercooler.]]>
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