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Definition of Manifold vacuum

Manifold vacuum Definition from Science & Technology Dictionaries & Glossaries
Dictionary of Automotive Terms
As the pistons move down on the intake stroke , they create a suction or vacuum in the intake manifold . This vacuum reading can be used to determine how well the engine is running.
Manifold vacuum Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
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.

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