Manifold pressure is measured
- at inlet port above and below ambient conditions
- at inlet port above and below standard atmosphere at sea level
- at inlet port indicating boost pressure
Explanation from PART66Online
Manifold (boost) pressure is sensed at the induction inlet port and can read either above ambient (supercharged/boosted) or below ambient (throttled). It is therefore expressed relative to the prevailing ambient atmospheric conditions, not fixed to sea-level standard atmosphere, which is why the indication moves about the actual surrounding pressure.
Indrajith asked · 5 Dec 2012
at inlet port above and below standard atmosphere at sea level....
If a manifold pressure gauge is measuring in a supercharged engine it will measure above 29.92 in Hg.If the supercharge is not use it will measure below that figure. EHJ Pallett Integrated Instruments Page-355
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