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Importance of engine vacuum

Updated: 10/19/2022
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11y ago

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An internal combustion engine needs air and atomized fuel to run. In a naturally aspirated engine (one which does not use forced induction), the downward movement of the piston, on the intake stroke, causes an area of low pressure or vacuum in the cylinder. The fuel and air mixture moves from the relatively high pressure outside to this low pressure area and is then compressed for combustion. Without this vacuum effect of piston movement, an alternate source of pressure would be necessary to effect this fuel/air induction.

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