Abstract: An intake manifold assembly (10) for use with an internal combustion engine. The manifold assembly (10) includes three main components, a cover (12), base (14) and runner beam (16). The cover (12) and base (14) mate to form cavity (18), encompassing a variable plenum (54) upstream of variable runners (52) formed by runner beam (16) and the variable runners (52). The variable plenum (54) of the exemplary embodiment is selectively split into two sections by a divider wall (34) and middle runner blade (48a). Rotation of the runner beam (16) causes a change in the length and/or cross-sectional area of the variable intake runners (52) as well as changing the variable plenum (54), thus varying the tuning of the intake flow into the engine, to optimize engine operation.

Abstract: An intake manifold assembly (10) for use with an internal combustion engine. The manifold assembly (10) includes three main components, a cover (12), base (14) and runner beam (16). The cover (12) and base (14) mate to form cavity (18), encompassing a plenum area (54) upstream of variable runners (52) formed by runner beam (16) and the variable runners (52). Rotation of the runner beam (16) causes a change in the length and cross-sectional area of the variable intake runners (52), thus varying the tuning of the intake flow into the engine, to optimize the flow for various engine speeds.