Abstract: The paper presents the results of visualization investigations into the fuel sprays produced by electromagnetic fuel injector (Bosch), which is used in the FIAT MultiJet 1.3 engine. The investigations were conducted on the EPS 815 test bench at different pressure values of fuel injection into the visualisation chamber. On the basis of the test results, the effect of injection pressure on the actual start and end of fuel injection into the combustion chamber was determined. The second stage of investigations involved the tests on the engine with the injector of concern. The scope of the tests included the following measurements: hourly fuel consumption, the cylinder pressure, the injection line pressure, and the current that controls the injector operation. On the basis of the experimental results, a comparative assessment of the impact of the addition of rapeseed oil fatty acid methyl esters, i.e. B20 fuel (80% DO + 20% FAME) and of commercial diesel oil on the basic parameters of the atomized fuel spray was made. The basic parameters of the fuel spray include: the maximum spray tip penetration lmax, the spray cone angle Θ, and Sauter mean diameter (SMD).
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