Engine Basic catch can routing?

project_88LX · Jan 18, 2022

I've googled and read and it seems most people refer to boosted setups or vented catch cans. I'm looking to install a basic inlet/outlet catch can for grins and because I'm bored. It's a pretty much stock setup with an explorer upper/lower intake. Do I take the big line from the upper intake into the can inlet then out of can to the PCV valve at the rear of the intake?

90sickfox · Jan 18, 2022

That's exactly how you get it done. It will go from where the pcv hose goes to the intake and from the can ro the pcv valve.

General karthief · Jan 18, 2022

You know it's useless unless you got a lot of blowby??
Just say'n

KRUISR · Jan 18, 2022

project_88LX said:
Do I take the big line from the upper intake into the can inlet then out of can to the PCV valve at the rear of the intake?

That sounds backwards.

The current/stock flow without a catch can is from the PCV valve at rear of lower intake through the hose to the fitting on the upper intake. The catch can needs to catch these vapours. It should have the hose from the PCV going into the inlet of your catch can (as defined by the catch can manufacture) and the outlet of the can to the lower intake (this is your vacuum source to move the vapour to the can).

96pushrod · Jan 19, 2022

Sounds more like an oil separator than a catch can. I’ve always thought of a catch can as vented to the atmosphere, which is how mine is. 2 lines off valve covers going to a vented can

Boostedpimp · Jan 19, 2022

96pushrod said:
Sounds more like an oil separator than a catch can. I’ve always thought of a catch can as vented to the atmosphere, which is how mine is. 2 lines off valve covers going to a vented can

And blocking the factory pcv port off in the back of the lower intake

Boostedpimp · Jan 19, 2022

If your not running boost and don't have a ton of blowby then you really don't need one. Just put a oil separator inline and call it a day.

But if you really wanted to do a closed system style catch can I believe you would want a three port type. Something like this

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And run one line from the pcv in the rear of the lower intake, second line from vacuum source on the upper intake manifold and third would need to go to I believe the clean air port on the oil fill tube on pas side valve cover.

I personally never did that setup, I've got the other one with a blocked off pcv, line from each valve cover to a catch can with a filter.

project_88LX · Jan 19, 2022

KRUISR said:
That sounds backwards.

The current/stock flow without a catch can is from the PCV valve at rear of lower intake through the hose to the fitting on the upper intake. The catch can needs to catch these vapours. It should have the hose from the PCV going into the inlet of your catch can (as defined by the catch can manufacture) and the outlet of the can to the lower intake (this is your vacuum source to move the vapour to the can).

Thanks! I did not realize I had it backwards.

project_88LX · Jan 20, 2022

KRUISR said:
That sounds backwards.

The current/stock flow without a catch can is from the PCV valve at rear of lower intake through the hose to the fitting on the upper intake. The catch can needs to catch these vapours. It should have the hose from the PCV going into the inlet of your catch can (as defined by the catch can manufacture) and the outlet of the can to the lower intake (this is your vacuum source to move the vapour to the can).

@

KRUISR

Wait, you mentioned out of PCV going into can then out of can to lower intake. I'm thinking it was supposed to be from PCV in lower intake to the IN nipple on can, then out of can and into upper intake?

KRUISR · Jan 20, 2022

That's what I said. The PCV grommet normally emits engine oil vapour that is normally sucked into upper intake fitting (right by cylinder 8 runner in intake). If you are looking to capture the oil vapour and not have it go into the intake, then the inlet of the can connects to the line from the PCV. Your can needs a vacuum source to draw the vapour into it, that's why the simplest is to connect outlet fitting on can to the upper intake.

OldManRiver · Jan 20, 2022

Lower was typed instead of upper,most understood.

Engine Basic catch can routing?

project_88LX

90sickfox

Wasn't a pretty sight...and I've got big hands

General karthief

wonder how much it would cost to ship you a pair

KRUISR

96pushrod

I think they're a little easier to get off

Boostedpimp

Boostedpimp

Air-Oil Catch Can Tank 3-Port Baffled Separator Universal Black Aluminum 5OZ | eBay

project_88LX

project_88LX

KRUISR

KRUISR

OldManRiver

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Wasn't a pretty sight...and I've got big hands

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