Catch can noob question

Sway

I just got in an oil catch can, I won’t lie it’s a cheap one I just bought better lines for it... but, the baffle is on the inlet, not the outlet... is that correct? I thought the baffle should go on the outlet to stop anything from going out, and the inlet should be free and open... am I wrong?

I was also planning on putting some steel wool in there to help it collect.

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nandosman

Switch the inlet/outlet

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FI Non-Res Test Pipes | FI 18" Res CBE | Stillen Gen 3 CAI | Dynotuned @ Dynosty EcuTek 325 whp

Sway

That’s what I was thinking just hook the hoses up different, but I want to make sure if I’m right or not first, maybe I’m not lol

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nandosman

Check out the diagram in this guy's video:

https://www.youtube.com/watch?v=PWz6vCnJ4CA

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FI Non-Res Test Pipes | FI 18" Res CBE | Stillen Gen 3 CAI | Dynotuned @ Dynosty EcuTek 325 whp

Buzzkill247

Baffle should always be on the inlet. The whole point of the catch can is to capture particulate matter and oil vapor/droplet. The purpose of the baffle is to cause a venturi-esque effect where the air is slowed, and particulates contact a surface to collect. "cleaned" air then escapes. This can't occur if a baffle is sitting right at the out/exhaust port.

TL:dr DO NOT switch the inlet/outlet like said above.

SouthArk370Z

In my experience with similar equipment in an industrial setting, it was always setup as per Buzzkill247 above - the work is done on the inlet side.

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nandosman

My logic says baffle should be on the outlet too, but I'm no expert.

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FI Non-Res Test Pipes | FI 18" Res CBE | Stillen Gen 3 CAI | Dynotuned @ Dynosty EcuTek 325 whp

Sway

Thanks all! Good info in here!

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-ZS-Carpenter

Are you just running lines just from the front pcv(like the DIY) or are you running both pcv and the intake breather vent into the can?

Sway

From the front pcv, but I also have an m370 so they’re t’d into a single line. Got it installed today! It looks nice! I’ll post a pic tomorrow... seb from specialty Z said my cars pulling a little timing possibly from blow by lowering my octane... I put on the catch can and used an air compressor to blow out the lines to make sure there wasn’t any oil built up in there. But I didn’t take off the upper mani and clean it... how long do you think I need to run before I can tell if it’s not pulling timing or anything? I feel like I need to take it apart and do some cleaning first.

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Buzzkill247

Why would you run the crank intake breather side off the catchcan?? 1) always run from behind the MAF so you always have metered and filtered air. 2) always run your catch exhaust to atmospheric vent or back to intake manifold.

Those instructions are there for a reason. Far smarter people have engineered and tested and wrote the instructions. For a reason.

Sway

Maybe I didn’t understand the question, the pcv is t’d in the front, those two lines connect into a line that runs to my in on my catch can, the out then connects to the directly to the back of the m370 manifold. Is that not correct? I’ll take pictures on my lunch break and post them.

Edit: before, there was one single line that ran from the two t’d pcv valves, directly into the back of the manifold. I basically just put a catch can in the middle of that loop.

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-ZS-Carpenter

So just leave the breather hooked up? I must have misunderstood when i started planning this, i thought both the pcv and the cc breather would allow oil and gunk back into the intake.

-ZS-Carpenter

And isn't the admin catch can combo running all 4 vents to the cans? cap the intake and manifold ports, run both vents on the valve cover per side to the can then vented via filter?

just like the 13th post here
PCV Delete, Catch Cans, and Unmetered Air

only I was going to use 2 cheaper cans......is that all wrong?!?

Arrvaxx

LOL. My first thought was "That looks like an EE drawing." Yup. He's awesome.

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