Engine manifold

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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.

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References in periodicals archive ?
Tenders are invited for Vacuum Pump With Manifold Vacuum Qty 4
It offers optional clamping, grid or manifold vacuum systems and the STRATOS utilizes an industry-standard G-code for control functions.
Any vacuum line that is connected to a direct vacuum source, or below the carburetor throttle plate/ plates, is referred to as manifold vacuum, meaning it gets a constant, direct source of vacuum.
Some of the monitored parameters include: intake manifold vacuum, lube oil pressure and temperature, jacket water pressure and temperature, auxiliary water pressure and temperature, main bearing and cylinder head temperatures, pre- and post-catalyst temperatures and exhaust manifold temperatures.
The system controls ignition timing and dwell based on engine speed and manifold vacuum.
Solar installation package will be delivered as a complete system to support DHW adapted to cooperate with the manifold vacuum.
96 sections from well vacuum manifold vacuum Acts HDPE 90 mm L = 106.
Incomplete combustion at high manifold vacuums was found to cause high exhaust HC concentrations during deceleration.
The design of the venturi is such that the throat is maintained at sonic velocity over most of the engine's range of manifold vacuums and the ratio of vacuum at any position above the throat to the throat is constant.