Brake torque of a diesel engine was investigated by considering the effects of biodiesel (from waste cooking oil) in fuel mixture (biodiesel and diesel fuel) on this performance characteristic. The experiments were done on a 4 cylinder direct-injection diesel engine. Results showed that by the use of biodiesel brake power decreases up to17%. Also results showed that the increase in engine load appeared to cause an increase in the brake power up to 69%. On the other hand by increasing rpm of the engine brake power increases continuously up to speed 1800 to 2000 rpm and after that drops.
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