What is intake manifold absolute pressure?

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asked Jul 11 in Other-Cars/Transportation by Yoni T (280 points)
What is intake manifold absolute pressure?

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answered Jul 11 by Larry S (20,790 points)
The intake manifold absolute pressure in a combustion engine refers to the engines vacuum and is the difference between the air pressure between the Earth's Atmosphere and the engines intake manifold.

The Manifolds vacuum is the effect of the piston's movement on the induction stroke and the choked flow through a throttle in the intake manifold of an engine.

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