Recently, the four-valve engine has become an increase of common type of gasoline engine. However, in such engines, the fuel supply is delayed because of the central wall of the intake port. Thus, the characteristics of a spray through an injector must be improved. This report presents the analysis on the fuel flow and experimental results on the characteristics of the spray injected through an upstream-swirl-type injector which was previously developed by authors. Installation of an adapter for splitting, the fuel spray below the metering orifice produces a two-stream spray. This adapter is a single-port type that has parallel walls with expansion chambers on the left and right (spectacle shape). Spray separation can be monitored by adjusting the position of these two parts. The two-stream injector atomizes and distributes fuel very well. It also improves starting and acceleration, as well as overall engine performance.