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In this work an analysis of biodiesel fuel use in stationary engines was made through performance tests in dynamometer. In the tests, the characteristics of torque, power, specific consumption and smoke index were determined for two cylinders diesel engines. Initially, the engines were tested working with diesel, and then the tests were done with the engines working with diesel and biodiesel mixtures specified by B25, B50, B75 and B100. The biodiesel used on the tests was of soy. The results show that the use of biodiesel is feasible, but with loss of power and torque when compared to pure diesel. For pure biodiesel (B100) at 3,000 rpm the power decrease was 4.03% while for B50 the decrease was 0.94%. The results for torque showed a similar behavior with a decrease of 4.08% for B100 and 0.93% for B50 at 3,000 rpm. The specific consumption increased, as expected, 12.25% for B100 and 5.44% for B50.