Intake Manifold: Description and Operation

DESCRIPTION
The intake manifold is a two piece design. The upper portion is made from a composite material and the lower portion is cast-aluminum. The throttle body attaches to the upper manifold. The lower manifold has an exhaust gas recirculation (EGR) port cast into the manifold for mixture of exhaust gases with the fuel and air mixture. The EGR valve bolts to the lower intake manifold.

OPERATION
The Central Sequential Multiport Fuel Injection (SFI), Central SFI system uses multiple injectors to meter and distribute fuel to each engine cylinder. The Central SFI unit is retained by a bracket bolted to the lower intake manifold. The fuel meter body also houses the pressure regulator. Metal inlet and outlet fuel fines and nylon delivery tubes independently distribute fuel to each cylinder through nozzles located at the port entrance of each manifold runner where the fuel is atomized.