Size a positive-displacement or centrifugal supercharger based on engine displacement, RPM, and target boost.
Input Parameters
Results
--
Required Airflow
cfm
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Blower Displacement
L
--
Estimated HP Gain
hp
--
Parasitic Drive Load
hp
Note: Roots/twin-screw blowers provide instant boost but draw 50-80hp parasitically at peak. Centrifugal units are more efficient but boost builds with RPM.
Reference
Natural CFM = Displacement(ci) x RPM x VE / (2 x 1728)
Pressure Ratio = (Boost + 14.7) / 14.7
Boosted CFM = Natural CFM x PR
Blower Displacement sized for 10% overcapacity
Parasitic Load approx. 2% of boosted flow x boost