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Volumetric Efficiency Calculator

Volumetric efficiency is a measure of how effectively an internal combustion engine can draw in and utilize air during the intake stroke. It is an important factor in engine performance and can be affected by a number of factors such as engine design, atmospheric conditions, and operating conditions. This volumetric efficiency calculator can help you determine the efficiency of an engine and identify areas for improvement!

Calculation

Inputs



Mass Airflow Rate, g/s
:3.6​



Engine RPM
:750​



Engine Displacement
:3L​



Barometric Air Pressure
:101325Pa​



Intake Air Temperature
:40degC​


Output



Volumetric Efficiency
:17%​



Explanation


VE=MAFRPM∗D∗(Disp120)VE = \frac {MAF}{RPM*D*(\frac {Disp}{120})}
Where:

VE=Volumetric efficiencyMAF=Mass airflow rate (g/s)RPM=Engine RPMD=Density of air (kg/m3)Disp=Engine Displacement (L)VE = Volumetric \: efficiency \\ MAF = Mass \: airflow \: rate \: (g/s) \\ RPM = Engine \: RPM \\ D = Density \: of \: air \: (kg/m^3) \\ Disp = Engine \: Displacement \: (L)
And the density of air can be calculated using:

D=P287∗IATD = \frac {P}{287*IAT}
Where:

P=Barometric air pressure (Pa)IAT=Intake air temperature (K)P = Barometric \:air \: pressure \: (Pa) \\ IAT = Intake \: air \: temperature \: (K)

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