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C:B ratio, call me stupid but...I understand how to get the volume of both the barrel and chamber, however I'm lost from there. for instance if i have a 2'' barrel that is 60 inches long the volume is 753.6. if i have a 4'' chamber that is 24 inches long i have a volume of 1205.76. but how do i get the ratio from that point?
Chamber to Barrel ratio
1205.76 to 753.6 1205.76 : 753.6 (1205.76 / 753.6) : (753.6 / 753.6) 1.6 : 1 Also, you are stupid but (reminds me of that "Call me an ambulance!" joke )
ty...wow, i don't know why that didn't click in my head.
as far as my stupidity...i was tired when i did that math and i accidently used the diameter instead of the radius.
As long as you are consistent then diameter or radius both work for calculating the CB ratio. CB Ratio = r<sub>chamber</sub>^2*L<sub>chamber</sub>/r<sub>barrel</sub>^2*L<sub>barrel</sub> = d<sub>chamber</sub>^2*L<sub>chamber</sub>/d<sub>barrel</sub>^2*L<sub>barrel</sub> (don't need pi either since it cancels out in the ratio anyway)
Re: C:B ratio, call me stupid but...When you do the ratio, the units of measure don't matter (cancel out). But FWIW, this is what I calculate: (2.00"/2)^2 * Pi * 60" = 188.5 cuin (3,089 cc) Nominal pipe diameter (2.05"/2)^2 * Pi * 60" = 198.0 cuin (3,245 cc) Typical pipe ID (Sch 40) (4.00"/2)^2 * Pi * 24" = 301.6 cuin (4,942 cc) Nominal pipe diameter (3.99"/2)^2 * Pi * 24" = 300.1 cuin (4,918 cc) Typical pipe ID (Sch 40) Ratio = 301.6/188.5 = 1.60 Ratio = 300.1/198.0 = 1.52
4"dia x 19" Chamber, 2" dia barrels, 49" and 73" long, Hairspray & BBQ piezo igniter
 
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