Intake Manifold: Description and Operation

DESCRIPTION





The composite upper intake manifold is a cross flow type with long runners to improve air charge inertia (Fig. 119). 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.





The aluminum lower intake manifold attaches to each cylinder head and uses a gasket for sealing (Fig. 120). The manifold coolant passage allows coolant to flow between cylinder heads. An attached steel tube, allows coolant flow to the heater.