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The spray of a 5-hole, V.C.O. nozzle for D.I. diesel engines has been studied; the data obtained from each hole were compared. A high pressure injection system (Elasis patent), electronically controlled, was used. To investigate the behaviour of each hole a “cap” was used to cover the nozzle in such a way that only one hole at a time could inject in the spray chamber. The investigation consisted of a photographic characterization with back-light technique and of the droplet size distribution through laser diffraction technique via Malvern. Four pressure values (30, 60, 90, 120 MPa) and three injected flowrates (10, 25, 40 mm3/inj.) were chosen to characterize the behaviour of the nozzle. Each test was carried out with the nozzle under normal running conditions, measuring the laser signal background after each acquisition.