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Manifold Pressure Idle vs Full Throttle

Asked by: 4485 views ,
Aircraft Systems

why is manifold pressure lower at idle than at full power which pressure is closer to ambient pressure

Logic would say as engine RPM increases, the suction would increase, yet the gauge shows less vacuum at high RPM

What am I missing

 

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2 Answers



  1. Brian on Sep 15, 2011

    Read this article: http://www.avweb.com/news/pelican/182081-1.html

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  2. pilotsteve on Sep 16, 2011

    Don’t forget that as the power lever increases the amount of air available to the engine also increases.  In other words, as the demand for fuel air mixture increases, so does the total amount available.
     
    Steve

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