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About: Manifold vacuum     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : dbo:Disease, within Data Space : dbpedia.org:8891 associated with source document(s)

Type: Thingdisease New Facet based on Instances of this Class

Manifold vacuum, or engine vacuum in an internal combustion engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere. Manifold vacuum is an effect of a piston's movement on the induction stroke and the choked flow through a throttle in the intake manifold of an engine. It is a measure of the amount of restriction of airflow through the engine, and hence of the unused power capacity in the engine. In some engines, the manifold vacuum is also used as an auxiliary power source to drive engine accessories and for the crankcase ventilation system.