[s-cars] Re: Math quiz: turbo compressor choices

[Djdawson2 at aol.com]

Mike,
Based on your info, I get:
VE=(792001.6*(325/.83)/(4800*135.8*14.7*9.3)

This doesn't make sense...  3.4ish....?

I based it on my dyno run, and input the rpm figure where that horsepower 
figure was developed.  What am I doing wrong?  I used 14.7 for AP, as the dyno 
figures were corrected to sea level. I used 135.8 for the displacement 
(61.02*2.226).

Also, where did you get .0756 as your conversion figure for CFM to lbs/min?  
I generated mine by calculating the molar mass of breathing air (28.9gm/mole), 
then converted liters to cubic feet... 1l = .0353147 cubic ft, so 1 mole 
(22.4 liters) of air = .791 cubic ft.  Therefore, one cubic foot of air has a mass 
of 36.54 grams (28.9/.791).  Divide that by 453.6 grams/lb, and I got 
.0806...  granted, only a 6.5% difference, but I'm curious where your number came 
from, and if it is more appropriate for these calculations..
Thanks for the info.
Dave