The performances of a new Scania swirl-generating inlet port geometry have been evaluated by means of Time-Resolved Stereo PIV in a water-analogue engine setup mimicking the intake stroke. Two con figurations have been inspected: a fi xed valve lift case and a more realistic situation where the valves move according to a typical lift pro file. A three-dimensional reconstruction of the mean flow has been made from a number of different measured vertical planes intersecting in the cylinder axis. A coherent swirling pattern develops in the three-dimensional flow, where the azimuthal component is predominant over the vertical and radial one. The organization of such large-scale flow structure increases with time during the stroke and with the distance from the cylinder deck.