Correct me if I am wrong, but a catch-can re-directs gasses / oily air from the crank-case, caused by excessive 'blow-by'.
The catch-can 'filters' the oily crap out and returns cleaner air to the inlet.
Mine catch-can is home-made, using a sedimenter / water seperator and coarse steel wool as the filter.
The gas travels down the centre through a tube, then turns 180 deg and comes back up through the wool into the inlet.
Since I opened up the ports a little more it was running sweet.
Crank-case blow by test.
Its not a test as such but can give an indication of engine wear. Remove the oil filler cap in the rocker cover after the engine has been warmed up and running.
Any gas pressure pushing out of this opening at idle would effectively be 'blow-by' gasses caused by excessive piston ring wear, out of round bore etc etc.
Combustion of gasses (air & fuel) is forced past the piston on the combustion stroke and up through the galleries and through the PCV, or in this case, out the oil filler.
The more knackered the engine is, the more pressure will be evident.
The tighter seal between the piston and cylinder, the less gas escapes, the more power and less 'blow-by'.
Remove catch-can and plumb as per original set-up.
Clean your inlet, intercooler etc and run it up the road for 5 mins or so.
Come back and pull it down.
Oil in PCV line, before turbo, will be sorted by suitable catch-can.
Oil in turbo, but not where PCV inlet is would mean turbo seal.
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