The influence of hydrocarbon fuels and biofuels on self-ignition delay period

Summary . The paper discusses an influence of hydrocarbon f uels and biofuels properties on selfignition delay period in AD3.152 UR engine. The period significantly affects the combustion speed, the rate of pressure and temperature increa se, easy engine starting and other engine performance characteristics. It also influences the em ission values of basic toxic components such as CO, HC, NOx, PM in exhaust gases. The values of self-ignition delay period were determined when the engine was fuelled by EKODIESEL PLUS 50 hydrocarbon fuel (environmentally friendly winter diesel oil) and FAME (Fatty Acid Methyl Esters) plant fuel, made of plant or animal oils fatty acids methyl esters. Investigatio ns into the engine were conducted in an engine test house equipped with a system for measuring pre ssures and other fast changing values. In investigations the engine was operated under load c onditions at the maximum torque speed n = 1400 rpm and rated power speed n = 2000 rpm. The analysis of results was made on th e basis of averaged pressures in indicator diagrams taken on 1 00 engine work cycles.