Reciprocation Engine Induction and Cooling Systems Oral Practice Test

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Define manifold pressure and what is it measured in?

The gauge pressure inside the intake

The pressure in the crankcase

Ambient atmospheric pressure

It is the average absolute pressure of the intake charge, measured in inches of mercury

Manifold pressure is the pressure inside the intake manifold—the pressure of the intake charge as it flows toward the cylinders. It is an absolute pressure, not a relative (gauge) value, and it is expressed in inches of mercury (inHg). This reading reflects how the throttle, engine load, and any boost affect the air entering the cylinders. It’s not the crankcase pressure, and it’s not the ambient atmospheric pressure, but the actual absolute pressure within the manifold at that moment.

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