Originally Posted by
ahausheer
Wanted to report my findings so far with my homemade catch can. I installed it for fun, basically an excuse to pop the hood and play mechanic. I am surprised at the amount of collected blow-by after only about 1000 miles. My catch can consists of a 1/4-inch compressed air/water separator from Home Depot. I removed the inner micro-perforated copper filter, as I felt it presented too much of a restriction, and then glued back in place the upper flow-director (plastic piece) to maintain some centrifugal action. I also placed some stainless steel pot scrubbers inside. After about 1000 miles of mostly highway driving (3,500 rpm+) I had accumulated about 1-2 ml of oil, maybe slightly more. The outlet of my catch can had oil in it, so some oil was still getting past my catch can and I felt a larger catch can would work better. I bought a much larger 1/2 inch separator. I'll give it a few thousand miles (or less) and report back. Ill try to get pictures. I think the high rpm and super light Mitsubishi oil is atomizing the oil into the air and its basically suspended thus getting past the PVC. Still don't think its a problem, but if your oil level drops slightly over time, its probably leaving the system through the PVC as opposed to bad rings of valve guides.