Kasey, if you read the thread you would see i was trying to build as nice a bench as possible with all my left over parts accumulated in the dream of building the a monster bench. So the $80 was for the motors, that is what i value them at as I bought 100 of these motors off ebay several years ago and was selling them for $20 a piece.Your price sheet shown $80, was that each or for all eight of your motors?
Have you looked at the lighthouse motors?
And to reiterate when we talk about depression and or differential pressure or Delta P or DP we are allays when referring to the a flowbench referencing this pressure in inches of water column "WC. If you search i recently wrote a post describing the flow through the orifice bench and why on a PTS bench we use 44"WC flow of a motor to pick the size we need or can afford.
Rick