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The paper presents experimental results concerning the fueling of two injection systems for D.I. Diesel engines with biodiesel fuel. The neat biodiesel (B100) was obtained from waste vegetable oil (collected from a local branch of McDonald's), using the base catalyzed method; diesel fuel was also used in order to test the injection equipments and obtain reference values. The in-line fuel injection pumps used during the tests were RO-PES4A90D410RS2240 and PES5MW55/320/RS/120403 (Bosch), with the corresponding high-pressure fuel lines and injectors. The injection equipment was mounted on a MIRKOZ test bed, equipped with pressure transducers, rotation angle transducer and a BOSCH injection rate meter. The tests were performed at different pump speeds and displacements of the injection pump control rack. The following injection characteristics were investigated: cyclic fuel delivery, injection duration, pressure wave propagation time, average injection rate, peak injection pressure.

The paper presents some results concerning the use of a Biodiesel type fuel in a direct injection (D.I) Diesel engine. The fuel was produced from waste vegetable oil, collected from the local McDonalds' branch. The engine was fueled with a blend containing 50% Biodiesel and 50% Diesel fuel (B50, Biodiesel blend). The tests were developed on a D-110 Diesel engine (S/D= 130/108 mm, ε = 17, three in line cylinders); the output power, torque, BSFC, combustion pressure, pressure rate and autoignition delay were measured and the heat release rate was calculated. We noticed a slight decrease of the power indices when the Biodiesel type fuel was used (output power and torque) and also of the peak combustion rate. The peak heat release rate decreased, while the autoignition delay has decreased by 2…4° CA.

The paper attempts to determine which traction model best fits with experimental data for a romanian lugged tractor tire. Different models for predicting net traction and traction efficiency for off-road conditions were considered. These models assume different tire-ground pressure distributions (constant, parabolic) over the undertread area and different contact patch length calculations. Experiments were conducted and the results were compared to the theoretical data. Two of the models are the best fit with the experimental data; both models assumed a parabolic pressure distribution over the undertread.