In automotive engineering, an intake manifold or inlet manifold is a part of an engine that supplies the fuel/air mixture to the cylinders. An exhaust manifold or header collects the exhaustgases from multiple cylinders into one pipe.
The intake manifold is located between the carburetor and the cylinder head. On multi point injected engines, the intake manifold holds the fuel injectors.
Exhaust manifolds were traditionally simple cast iron units which collected engine exhaust and delivered it to the exhaust pipe. However, this restrictive tube is often replaced with individual headers which are tuned for low restriction and improved performance. Headers have been widely available from aftermarket sources for decades, and some manufacturers have begun using them as original equipment. The Honda J30A2 engine does away with exhaust manifolds altogether, using an integral engine block passage to route gasses directly to the catalytic converter.
Manifoldvacuum is an effect of choked flow through a throttle in the intakemanifold of an engine.
Manifoldvacuum should not be confused with venturi vacuum, which is an effect that is exploited in carburetors to achieve a fixed mix ratio between fuel and air.
The manifold is connected directly to the airintake and the only suction created is that caused by the descending piston with no venturi to increase it, and the engine power is controlled by varying the amount of fuel that is injected into the cylinder by a fuel injection system.
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