Common problems facing the world at the present time is the depletion of petroleum reserves and negative impacts of the use of fuel oil. This phenomenon prompted us to look for alternative fuels that can solve both problems at the top, in this case the gas fuel is biogas. This study aims to analyze the performance of the diesel engine designed R175AN TIGER system uses two fuel (dual fuel) diesel and biogas results of palm oil waste to methane content of 70% to produce electricity as well as the addition of catalytic converters in the hope of reducing exhaust emissions. Maximum power is obtained on the use of pure diesel + 4 l / min for 1381.76 biogas Watt, maximum torque occurs in pure diesel + 4 l / min biogas, amounting to 8.8 Nm at 1500 Watt load rotation 1500 rpm, maximum SFC occur on materials diesel fuel loading 600 Watt 1000 rpm rotation of 875.29 g / kWjam, AFR value at solar maximum + 6 l / min biogas load 600 Watt 292.37 rotation of 1000 rpm, the maximum thermal efficiency in solar + 6 l / min for biogas 45.26% at 1000rpm rotation load of 600 Watt, the average effective pressure occurs at solar maximum of + 4 l / min biogas loading 1200 Watt 1500 rpm rotation of 312.93 kPa, the largest opacity on the use of diesel + 2 l / min biogas in 1500 watt load 1500 rpm rotation by 31%. Levels of HC (Hydro Carbon) and CO (Carbon Monoxide) decreased when using catalytic converters. By using biogas can save the economic value of solar 100401108