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How do I make a homemade Oil Catch Can?

Thanks to Ace996

Click the images to make them larger

A Commerical (non homemade) aluminium oil catch can is available... For more informaton see HERE

Reason to have an oil catch can:
It basically catches the oil so it does not get sucked up into your intake or blower.

Cost: about $25 bucks


I went to Home Depot and looked at the available air-compressor filters. There were two, the one I installed and one that was much heavier and bulkier. Next I went to the fasteners dept and found the proper screws to mount the filter to the mounting bar. The mounting bar was a piece of aluminum bar that is also sold in the fasteners dept. I tried to find the proper fittings at HD, but they were too cumbersome. I went to SandK Speed, the local speed shop, and found the proper fittings for the filter. I bought two feet of 3/8th inside-diameter fuel-line and 4 hose clamps.

I came home and teflon taped the brass fittings and installed the 90degree elbows. Next, I eyed the mounting position for the filter. I decided the passenger-side mounting of the rad-fan was as good as any, so I pulled the screw and eye-fitted the aluminum bar for a mount. I bent the bar over a table and drilled a hole. With the bar mounted, I located the filter's mounting points on the bar and drilled two smaller holes...thankfully they lined-up. I then eyed the fuel-line and cut to fit. I slipped the 4 hose clamps over the tubes and tightened them up. All done, about 40 mins total...should have been 20mins.


Again, another couple of tablespoons in the jar today. When I came home from work, I decided to see what was the deal. I opened the hood and left the car running just to see what type of flow we're seeing through the filter....HOLY CRAPOLA!!!! The oil was spinning like a blender. When my wife reved the motor, it spun even more so.

I don't think there is a need to cut the white-sand filter element as there is plenty of flow available, blow through'll see. I also noticed that the cheap fuel-line I bought at Pep Boys was flattening due to the "MASSIVE" negative pressure inside the tubes. This negative pressure, after taking the tubes off and pinching them, is a direct result of the return line entering the intake manifold. The oil in the container was not a result of the crankcase pressure forcing oil out, but the intake manifold sucking it out of the crankcase. When I disconnected the return line to the manifold, and left the crankcase line connected to the filter....NOTHING. The oil didn't move. When I slipped the return line back on the filter.....the oil started spinning like a top.

I decided that there's no way I'm going to let my engine drink oil, so I took another trip to the speed shop. I bought some upgraded 3/8 Inside Diameter line, about 2 feet, and a small K&N breather filter. I also bought a brass cap to fit over a piece of the plug the intake manifold return bung.

When I came home, I turned the filter around so the intake side of the catch-filter is closer to the crankcase and put the little breather filter on the exhaust side of the filter. This is now a "classic" open-ended catch-can filter. I considered keeping my initial install, without the mini-K&N, and running the line to the air-box...but I still don't want the oil getting sucked out of the engine. If the engine wants to burp, its able to...but only when its needed.


Pictures part II

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