Does anyone have the formula or method to calculate the total CFM
air flow for rotary engines?I need to figure it out to make the
appropriate selection for a blower. I plan on cnc my own roots
blower, seems to fit my needs for the rotary.

david jr.



The tuning has a large effect and the type of intake ports. Tuned
p-ports can give you 120% VE.

Paul Lamar


3(square root of 3)x eccentricity x radius x width/1000. This gives the
rotor displacement for one side of one rotor. Measurements in mm
with the displacement in cc. Then if using a tuned pport intake multiply
by 1.20 for the VE. Then times 2 to compare with a four stroke engine
to get comparable displacement. There is a formula somewhere to
come up with the airflow figuring the boost pressure for boosted air
flow.

Dale Davies



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