Engine manifold

Engine manifold

An arrangement or collection of pipes or tubing with several inlet or outlet passages through which a gas or liquid is gathered or distributed. The manifold may be a casting or fabricated of relatively light material. Manifolds are usually identified by the service provided, such as the intake manifold and exhaust manifold on the internal combustion engine. Some types of manifolds for handling oil, water, and other fluids such as engine exhaust gas are often called headers. In the internal combustion engine, the intake and exhaust manifolds are an integral part of multicylinder engine construction and essential to its operation. See Internal combustion engine

The engine intake manifold is a casting or assembly of passages through which air or an air-fuel mixture flows from the air-intake or throttle valves to the intake valve ports in the cylinder head or cylinder block. In a spark-ignition engine with a carburetor or throttle-body fuel injection, the intake manifold carries an air-fuel mixture. In an engine with port fuel injection or in a diesel engine, the intake manifold carries only air. For the diesel engine, the air should be inducted with a minimum of pressure drop. The purpose of the intake manifold is to distribute the air or air‐fuel mixture uniformly to each of the cylinders and to assist in the vaporization of the fuel.

The engine exhaust manifold is a casting or assembly of passages through which the products of combustion leave the exhaust-valve ports in the cylinder head or cylinder block and enter the exhaust piping system. The purpose of the exhaust manifold is to collect and carry these exhaust gases away from the cylinders with a minimum of back pressure.

Some automative spark-ignition engines have an air-distribution manifold as part of the exhaust-emission control system. This manifold distributes and proportions air to the individual exhaust ports through external tubing or integral passageways.

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
This section focuses on characterizing intake and exhaust pressures in the engine manifold. For this, data were obtained from three pressure sensors placed: (1) after the capacitor at the engine's intake, (2) right after the compressor, and (3) in the exhaust manifold.
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With the Moog H-ST-100 test solution, XinDeBao can conduct flex coupling component durability tests to simulate the relevant movements of two boundaries (engine manifold end and exhaust pipe end) in 6 degrees of freedom (DOF) from a real-time time history domain.
The laser was triggered from more than a mile away and burned a hole through the bonnet and engine manifold in seconds.
Others change the entire exhaust unit, right from the engine manifold to the end pipe.
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These engines would incorporate a device similar to a car's catalytic converter that would be part of the engine manifold. This technology is still being developed, however, and the engines must be proven durable and safe to use in a marine environment.
McRae retired from the Rally of Portugal when when he holed his Ford Focus' engine manifold, stranding the car on stage eight.
Siemens is currently carrying out engine manifold tuning studies with respect to engine performance and induction noise.

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