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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 (lower than atmospheric pressure) exists in the intake manifold. This manifold vacuum can be substantial, and can be used as a source of automobile ancillary power to drive auxiliary systems: power assisted brakes, emission control devices, cruise control, ignition advance, windshield wipers, power windows, ventilation system valves, etc.
we provide comprehensive and high quality services like engineering, installation, calibration, testing, commissioning and maintenance of process control instrument system for refinery, petrochemicals, power plants, fertilizer, and chemical plants etc.
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 to each intake port in the cylinder head(s). Even distribution is important to optimize the efficiency and performan){kind=link}