manifold pressure


Also found in: Acronyms.

manifold pressure

[′man·ə‚fōld ‚presh·ər]
(mechanical engineering)
The pressure in the intake manifold of an internal combustion engine.

manifold pressure

The absolute pressure in the intake manifold of a reciprocating engine. It is the pressure at which the fuel-air mixture is forced into cylinders and is equal to the atmospheric pressure plus a boost less friction losses in the manifold less the pressure drop across the throttle valve. It is indicated by a manifold absolute pressure (MAP) gauge. It may be an indicator of a throttle setting and power output if the RPM is constant.
References in periodicals archive ?
At each EGR level, a constant pressure differential of 8 kPa between the intake and exhaust manifold was maintained (with the intake manifold pressure being higher than the exhaust manifold).
The subsequent exhaust stroke (open outlet vales) and induction stroke (open inlet valves) run at exhaust gas manifold pressure and intake manifold pressure, respectively.
The reduction in altitude to 350 m above sea level, which corresponds to the increase of apparent barometric pressure, was simulated with increasing the inlet manifold pressure of the engine by using a three-lobe rotary blower of the Roots type.
The simulation models for the intake manifold as a differential equation for the manifold pressure.
The relatively low manifold pressure drop with the Original design with small plenums and no plate was the result of the large area for the first distributor, 1/3rd of the inlet manifold area, Equation (2).
One that held a great deal of promise made use of an extra sensor not normally included in production cars that monitored exhaust manifold pressure.
The pressure terms are substituted for terms involving the slot flow by rearranging Eq 12 and substituting into Eq 5 to obtain the manifold pressure gradient:
Tomorrow's lightplanes will all employ a single, simple power control - as easy to use as a car's accelerator pedal - rather than the current complex system of separate levers to adjust manifold pressure, fuel mixture, propeller speed, and, in some cases, turbocharger boost.
Pressure sensors -- which consist of silicon membranes etched so thin that changes in external pressure result in changes in the membranes' easily monitored electrical resistance -- now keep track of blood pressure in human patients and manifold pressure in millions kf cars.
Nearly 30 of them are the MEMS sensors and about five to six are the MEMS pressure sensors which consist mainly of the intake manifold pressure sensor (MAP Sensor), barometric pressure sensor (BAP Sensor), hydraulic tank sensor, TPMS pressure sensor, airbag pressure sensor and ESC/ESP pressure sensor.
An external source is most often used for air supply which is convenient because the intake manifold pressure can be regulated independently of exhaust manifold enthalpy.
Under those same high and hot conditions, I'll likely need an extra inch or so of manifold pressure to hold altitude in various maneuvers, like holding or sliding down an ILS.