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Landrover Rangerover Inlet manifold

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Inlet manifold

An intake manifold or inlet manifold is part of an engine that supplies the fuel/air mixture to the cylinders. An exhaust manifold or header collects the exhaust gases from multiple cylinders into one pipe.

The main purpose of the inlet manifold is to evenly distribute the combustion mixture (or air only in a direct injection engine) to each intake port in the cylinder head or heads. Even distribution is important to optimize engine performance and efficiency. Inlet manifolds can also serve as a mount for the carburetor, throttle body, fuel injectors and other engine components.

Due to the downward movement of the pistons and the restriction caused by the throttle valve, in a reciprocating spark ignition piston engine, a partial vacuum, which is lower than atmospheric pressure, exists in the intake manifold. This manifold vacuum can be substantial, and can be used as a source of power to drive secondary systems: ignition advance, power assisted brakes, cruise control, windshield wipers, power windows, ventilation system valves can all use the vacuum to derive power.