I am trying to add on to a port tube from Parts Express to get to an equivalent 7" 1 1/2" length. The problem is that it tapers from 1.430 inches to 1.700 inches inside diameter at the big end before the flare. I decided to cc the thing to see what I had. In theory, the 7" fixed diameter tube should hold 203cc/ . The existing tube when filled to the top of the flare took 235 cc. The problem is I have to cut it down and put an elbow on it and extend from there.
This certainly won't give me a fixed diameter. And it will have a rising volume exit. So do I calc the total cc's (and to where) or correct for the volume? How can I figure the total resistance without using a flowbench?
From what little I know (and it isn't much) a bigger tube needs to be longer. The fixed 1.5 inch is no problem, but not sure how the blend works. And I can't get the thing back out once it is assembled, so I have to get it right the first time.
