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A study of the internal flow in the most used nozzle types in Diesel engines (microSAC and valve covered orifice VCO) was carried out in order to compare injection characteristics and understand the differences between them. To determine these differences, several experimental installations will be used, such as the injection rate test rig, steady flow test rig and spray momentum test rig, to obtain a full hydrodynamic characterization. With the help of the silicone methodology and a microscope, it is possible to determine the needle tip geometry (seat). As the geometrical characterization of the components in both nozzles was known, it was possible to carry out a CFD analysis at several needle lifts and thus observe the behavior of the internal flow in the nozzle seats and be able to compare both nozzles

An experimental procedure to determine the two components of the crankshaft force on the bearing cap is presented in this work. The method is based on the use of two load cells, one in each bearing cap bolt. A system to calibrate the force transference from the bearing cap to the load cells has been used. This system allows the calculation of the two components of the crankshaft forces as a function of the load cells signals. Some experiments have been done with this system, and the results of a firing and motored engine have been compared in order to know the influence of combustion and inertia forces on the crankshaft load in the bearing cap. The results are compared with a model for the dynamics of the piston-connecting rod-crankshaft system.