Here's some pics of an oil separator i made from gluing together a few dollars worth of pvc pipe. The main body is 2" sch40. The inlet holes into the main body were made in a drill press using a 3/4" hole saw. Hardware store 3/4" barbs were used for the fittings. Ends were turned from smaller caps turned down to fit inside...
The inlets come into the main body on a tangent, the exit tube at the bottom extends up inside to within 3/8" from the top. There is a small tube in the bottom of the outer chamber, i drain it from time to time to monitor the amount of oil being drawn in. The outside of the "can" was turned down to reduce it's thickness on the ends, and to make it look less like something made from pvc...
The engine is out at the moment, so i installed a dummy to show the overall layout of my system. The hoses in/out of the firewall lead to an electric vac pump...
I made fittings from Delrin to plug into the valvecover tubes...
The car uses an electric pump (Delco 215-425) as a vacuum source, hidden behind the dash. It pulls about 4"Hg on 12v, 8"Hg if wired to run on 18v cordless battery pack when the n2o is activated. When cruising around town, i use a dropping resistor to reduce the voltage the pump sees to about 9.5v. I'm not sure of the oem application of the pump i'm using, but they can be found in wrecking yards. I bought mine new for around $100...
The pump body also has an exit port for attaching a hose, i use it to expell the crankcase vapors back out to the engine compartment, under the car.
