Airflow Calculations

Posted: June 28, 2012 in Induction Systems

An article from Steven P. Duray,

Airflow Calculations:
True Volumetric Efficiency = TVE
TVE = Actual Intake Volume / Engine Displacement
This is often seen as VE = Actual Airflow / Theoretical Airflow on an engine dynamometer.

Turbocharger Compressor Pressure Ratio = PRCOMP
PRCOMP = (Boost + Atmospheric Pressure) / Atmospheric Pressure
NOTE: For every 1000 ft of elevation increase, you lose approximately 1 psi of atmospheric pressure.

Air Density Formula:
Air Density = (2.703)(Absolute Pressure) / (Temp + 460) the answer is in lbs/ft3

Intercoolers:
Intercooler Air Temp Formula:
TIC out = TCOMP out – (EfficiencyIC)(TCOMP out – TAMB)
NOTE: Typical pressure drop across an intercooler is between 0.5 and 1.5psi. The average intercooler efficiency is usually between 65-70%.

S.P. Duray 20120416

A greatful thank you to Mr. Duray for his contributions.

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