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Engine Vacuum Calculator Online

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Engine vacuum is an important aspect of the internal combustion engine that directly impacts its performance. In simple terms, it's a measure of the amount of air pressure present in the engine compared to the atmospheric pressure. When the pistons in the engine move down during the intake stroke, they create a vacuum (or low pressure area) that allows the engine to draw in air and fuel.

The Formula and Calculation

The primary formula used to calculate engine vacuum is:

Engine Vacuum = Atmospheric Pressure - Manifold Pressure

Here's what each term represents:

  • Engine Vacuum: The amount of air pressure in the engine compared to the atmospheric pressure.
  • Atmospheric Pressure: The pressure exerted by the atmosphere at a specific altitude. It typically averages around 14.7 psi at sea level.
  • Manifold Pressure: The pressure in the intake manifold of the engine as measured in psi or inches of mercury (in-Hg).
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The Engine Vacuum Calculator created here requires you to input the Atmospheric Pressure and Manifold Pressure. Once you click the calculate button, it uses the formula to compute the Engine Vacuum.


Let's consider an example where the Atmospheric Pressure is 14.7 psi (average sea level pressure) and the Manifold Pressure is 5 psi.


  • Atmospheric Pressure: 14.7 psi
  • Manifold Pressure: 5 psi

Using the formula, Engine Vacuum = 14.7 - 5, we get the Engine Vacuum as 9.7 psi.

Please note that engine vacuum can vary widely based on several factors like the engine's speed, load, throttle position, etc. Regular monitoring and understanding of engine vacuum can aid in better maintenance and performance of your vehicle.

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