Analysis of Emissions of a Diesel Cycle Engine using Biodiesel of the Macaw Palm Oil

Abstract. The combustion and emission characteristics of a diesel engine are influenced by the fuel spray characteristics and by the atomization as well as by the fuel properties. The aim of this work was to evaluate the performance of a diesel engine and its exhaust emissions when fueled with macaw palm oil biodiesel and different proportions of blends of this biodiesel with diesel fuel, such as B20, B40, B60 and B100. For the tests, an A950 Valtra tractor with a 420DS AGCO Sisu Power diesel engine was used. For the engine performance test, the ABNT NBR ISO 1585 Standard was adopted and for the emissions the NBR 14489 Standard was. The engine power when fueled with macaw palm oil biodiesel blends was lower 18,4 % in average than when it was fueled with diesel fuel. The torque values were in average 17,4% higher when the engine was fueled with diesel fuel in relation to when using biodiesel blends. The opacity values were lower when using biodiesel blends than when diesel fuel. HC values were lower when using B20, CO₂ values were higher when using B100 and O₂ values were slight lower when using B100 compared to the values when using diesel fuel. In Brazil, nowadays, according to the law, metropolitan diesel fuel is composed of 7% of biodiesel and 93% of diesel fuel.