High-speed visualization of the cavitation structures formed inside single- and multihole transparent replicas of nozzles used with low-speed two-stroke diesel engines has been performed simultaneously with the near-nozzle spray dispersion angle resulting from the atomization process of the injected liquid. The nozzle designs investigated incorporate cylindrical as well as tapered holes. The two-phase nozzle flow structures appear in two distinct forms, referred to as geometric-induced cavitation and dynamic or string cavitation. Cylindrical holes induce cavitation while tapered holes suppress it, although cavitation strings have been monitored in all nozzle types. Comparison between cylindrical and tapered nozzles in the absence of string cavitation has allowed the influence of geometric cavitation to be quantified, while acquisition of high-speed images has allowed for comparison between images in the absence and presence of cavitation strings to be made. In addition, information is provided for the variation of the spray cone angle expressed in terms of the probability of finding dispersed liquid along the spray cone and its distribution function for the different nozzle designs. The results indicate a significant increase