Who's running a catch can?

wstar

Seems like as good a thread as any to report on my catch can results from driving so far. My can has been on ~2,000 miles, and I dumped it last night for the first time and measured it. It collected 1/4 cup almost exactly, which matches perfectly with the "2 tbsp per 1K" modme posted above, and "1 tbsp per 500mi" someone posted in another thread.

My car is NA, so apparently FI doesn't really increase the catch can fill rate. Looks like engine oil but a little thicker and darker than mine looks when I drain it, leaves a greasy residue, and smells of fuel a little bit, which I guess makes sense considering it's condensed crankcase vapors.

Mine's running on both PCV lines. The fresh air tubes should be bringing fresh air into the crankcase, not venting gasses from the crankcase, so I don't *think* you need a catch can on those. Since we have two separate PCV lines, you'd need either a can with 4 connections, or two cans, if you want to leave everything else about the PCV system bone-stock.

As it happens the M370 manifold from Motordyne requires to you tee-adapter your 2x PCV into one vacuum connection anyways, so that made a single can setup on my car a no-brainer. Even with the stock manifold, you could tee them together, run a single can to one of the original inlets, and cap the other off. Just a matter of what you want to do with the hoses.

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