Patent ID: 7455043

Claim:
A variable-geometry intake manifold ( 3 ) for an internal-combustion engine ( 1 ); the intake manifold ( 3 ) comprising: at least one intake pipe ( 9 ), which connects the intake manifold ( 3 ) to at least one cylinder ( 2 ) of the internal-combustion engine ( 1 ); a partialization device ( 13 ) for varying the geometry of the intake manifold ( 3 ) that comprises at least one partialization body ( 15 ), which is set inside the intake pipe ( 9 ) and is provided with a shaft ( 16 ) mounted so that it can rotate about an axis ( 18 ) of rotation; and at least one angular-position sensor ( 23 ) for determining the angular position of the shaft ( 16 ) about the axis ( 18 ) of rotation; the intake manifold ( 3 ) being characterized in that the angular-position sensor ( 23 ) comprises: a permanent magnet ( 24 ) fixed on the shaft ( 16 ) and set on the inside of the intake pipe ( 9 ); and a reader ( 25 ), which is designed to read the orientation of the permanent magnet ( 24 ) and is set on the outside of the intake pipe ( 9 ) in the proximity of a wall ( 19 ) of the intake pipe ( 9 ) itself and in the proximity of the permanent magnet ( 24 ).