Intake Manifold: Description

The composite upper intake manifold is a cross-flow type with long runners to improve air charge inertia (Fig 1 ). An active Short Runner Valve (SRV) opens during certain operating conditions to improve top end performance. A Manifold Tuning Valve (MTV) connects the plenums at specific engine speeds to maximize low RPM torque without reducing high RPM power.

Fig 1: Upper Intake Manifold

Courtesy of DAIMLERCHRYSLER CORP.

The aluminum lower intake manifold attaches to each cylinder head and uses a gasket for sealing (Fig 2 ). The manifold coolant passage allows coolant to flow between cylinder heads. An attached steel tube, allows coolant flow to the heater.

Fig 2: Lower Intake Manifold

Courtesy of DAIMLERCHRYSLER CORP.