On multiport fuel injected engines, fuel is introduced to the intake air stream by individual fuel injectors located at the ends of the intake manifold runners. On carbureted engines and fuel injected engines with Throttle Body Injection (TBI, also called single point injection), the intake air mixes with fuel as it enters the intake manifold. Depending on the vehicle model, the intake manifold can be mounted either on top of the engine between the cylinder banks, or at the side of the engine, attached to the cylinder head. The air enters from a central point, a carburetor or, on fuel injected engines, a throttle body, and then travels through individual passages called runners to the cylinder head(s). The intake manifold channels the air needed for combustion into the cylinder head intake ports.
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