As my shop is being reincarnated again, I'm wanting to get a cyclone to replace my HF DC when I put it back together. I've certainly got some ceiling height issues with a maximum of 91.5", but my question revolves around airflow of various cyclones. I plan to reuse the 6" S&D ductwork I took down for the remodel. So my question is this. What if any advantage is there to using a larger DC with 6" ductwork.
An Oneida V3000 has a 6" inlet rated at 1285 CFM @ 3" SP w/ Filter
An Oneida V5000 has a 8" inlet rated at 1,498 CFM @ 1.65" SP
An Oneida 3HP Super Dust Gorilla has a 8" inlet rated at 1554 CFM @ 1.8 SP w/ Filter
A Grizzly 441 has a 8" inlet rated at 1654 CFM @ 2.0" SP
I have to believe that choking the 8" inlets down to 6" will reduce their rated CFM to the point that it would be competitive with the V3000. I could believe that it would be at a higher static pressure though. I can think of a couple of disadvantage, in the way of price, size and noise. So what, if any advantage is there to going with a larger DC and 6" ductwork?