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Oil Catch Can

UPDATE: Operating the car with the catch can in place for several thousand miles resulted in new oil leaks at multiple locations.  After weeks of research the leaks were the result of excessive back pressure in the engine caused by the catch can.  The oil leak problems stopped after returning to the factory design.  This is an indication that the catch can had too much resistance for the amount of blow-by being produced.

While doing the turbo actuator swap I found oil in the intake side of the turbo.  With the intake manifold removed it was clear this oil isn't the best thing for my engine.  Honestly w
ith over 280 thousand miles, it shouldn't come as a surprise the engine has a little blow-by.

The use of oil catch cans are popular in most forms of auto racing so I adapted that principle and built my own.  As with all my projects the goal was keep it simple, clean looking and functional.  So here's what my version looks like.

Want to build one, here is a parts list:
  • I bought the can from eBay for ~$20 to my door (search for "Billet Aluminum Oil Catch Can Quarter Midget Go Kart")
  • A local race shop re-threaded it for 3/8" NPT. The straight and 90 degree 3/8" NPT Male x 1/2" Barb fittings came from eTrailer.com
  • The stainless steel is an unwound Scotch Bright scouring pad thats been trimmed shorter and stuffed into the can.
  • The black hose between the PCV valve and can is 1/2" Poly Drip Watering Hose from HomeDepot.
  • The hose from the can to the intake side of the turbo is the original line trimmed to fit.
  • Mounting is simply 2 hose clamps bolted to the faux firewall.
That should get you going

How does an oil catch can work?

The PCV vapors & oil enter the side of the catch can. Inside the can loosely wound stainless steel catches the oil and allows it to drip to the bottom of the can.  Meanwhile clean - oil free air is pushed out the top of the can and back into the air intake system at the factory location.

For draining of the collected oil the can can be removed or you can use the petcock valve in the bottom of the can.