Quote Originally Posted by dillon.ornelas View Post
it raised more questions than it answered
to start the fluid we are dealing with isn't ideal (one which is in-compressible and has no viscosity) then we have to deal with the fact that flow is unsteady and at times not laminar (it comes out in pulses)
then we have to deal with head losses, losses from fluctuating temperature, expansion and contraction, friction and turbulence from bends, surface imperfections and viscosity. (there is probably more that im forgetting).
hence why f1 designs headers with trial and error (the people who make them are very experienced) and why every year they look completely different.
You were asking specifically about sizing, not about head loss due to bends and temperature loss

these cant be avoided with the design of a streetcar