If you were to spin the blower to 27,300 rpm, how much 'Hot Air'
would be present at the output of the blower. . .
Below the value of 1728 equals 12^3, or one cubic foot.
And where the 1.9L blower, equals 115.9 Cubic Inches.
=> (115.9 * 27,300 / 1728)= ~1,831 CFM.
If that air was at, or around 70°F, the engine could produce about. . .
=> (1831 * 0.67)= 1,227 fwHP.
***The value of 0.67 is equal to the ASE% for an efficient engine. . .
Or the Air Standard Efficiency Percentage.
Working with these numbers now for many years, I have determined that a 'Good' mass flow recovery system, will reduce (via cooling) that value of 1,831 CFM down to a useful number, when we apply the value of 75%.
=> (1831 * 0.75)= ~1,373 CFM.
This would amount to a 'potential' value of ~920 fwHP. . . .On Gasoline!
Please understand that a stock blower will not flow that amount.
It must either be ported, or a larger blower put into service.
Please also understand that adding Meth around the blower, can help immensely.