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This paper focuses on the spray and atomization characteristics of a Micro-Variable Circular-Orifice (MVCO) fuel injector coupled with a unique swirl adapter. Spray characteristics produced from this configuration, such as spray penetration length, spray velocity and the droplet size distribution were evaluated under different injection pressure and air inlet pressure. Diesel injection pressure ranges from 300 bar to 700 bar at a back pressure of 1bar while compressed air at pressures of 2 bar and 4 bar was supplied to the swirl adapter. High speed Mie scattering images were recorded to capture the spray evolution, as seen from both the front view and the bottom view. Phase Doppler Anemometry (PDA) measurements were conducted at different locations in the spray for the acquisition of droplet sizes and velocity distributions.