safe supercharger cfm = (162)(3.14)(stroke)(bore ÷ 2)2
Pictured is a supercharger with 2 carburetors and the air intake on top.
What you do:
Calculate the super charger cfm (cubic feet per minute or ft3/min) your engine can handle.
Factors to consider:
maximum supercharger boost in psi = 14.7 psi x supercharger cfm
Engine cfm is typically between 500 - 1500. The algorithm to accurately calculate engine cfm is long, so see factor 2 (below) to get an easier set of equations to use.
First, calculate the cubic inches of the cylinder when the piston is at tdc (top dead center). The term tdc means the piston is at the top of its travel.
cubic inches at tdc = (3.14)(stroke)(bore / 2)2
heat factor =      supercharger cfm
cubic inches at tdc
If heat factor > 162, your supercharger is beginning to produce significant heat. You can still increase the supercharger cfm past this point, but you will soon begin to lose horsepower. The equation below puts it all together.
safe supercharger cfm = (162)(3.14)(stroke)(bore / 2)2
The HiPerMath equation is:
supercharger weight = supercharger cfm + 50
Supercharger weight includes the belt, pulleys and intake pieces, such as spacers.
A supercharger is driven by the crank, so its cfm is related to rpm (revolutions per minute). There is no lag in boost, like a turbo would have.
cfm = cubic feet per minute = ft3/min
psi = pounds per square inch = lbs/in2
rpm = revolutions per minute