Intake conduit with variable geometry for an internal combustion engine

The intake conduit comprises an inlet 19 and outlet 20, associated with the annular seat 14 for an intake valve 12. The intermediate axial portion 22 of the conduit has a partition 24 dividing the conduit first and second passages 25, 26. The first passage is aligned with the outlet opening and the second passage merges laterally with the first passage, upstream of the valve seat. A wall 26a is adapted for tangentially deviating the flow in the second passage towards the outlet. In the inlet portion 21 of the conduit there is a flow-deflector 30 adapted to assume first and second working positions, in which the flow coming from the inlet is predominantly directed towards the first passage and the second passage respectively, as well as a plurality of intermediate working positions between these two positions. The flow-deflector may be attached to the partition is a rotatable manner and driven by an electrically operated actuator 40. The actuator may be driven by a control unit 50 as a function of the operating conditions of the engine.