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Oil Catch Can Q's

2.5T_/<ouki

By 2.5T_/<ouki,
in Engines & Forced Induction

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2.5T_/<ouki Contributor

2.5T_/<ouki

Posted
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Hi Guys,

Truly appreciate all your help as it helps me out quite a bit.

I'm ready to install my oil catch can setup but I'm a little confused as to where i am going to put the little "filter" to make my crankcase still ventable.

I've got a Greddy can which has (2) inlets, my PCV valve is capped off, and my (2) breathers up top T together and would only use up (1) Greddy oil can inlet; which leaves the other inlet on the catch can open. Should i place the little filter on this open inlet?

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KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

^^^as above. I have plumbed mine into the intake. If you vent to atmosphere

1. its probably illegal

2 you can get undesirable smells wafting into the cabin

3 you may get oil mist making a mess of your engine bay.

2.5T_/<ouki Contributor

2.5T_/<ouki

Posted
  • Author
Posted

IIRC, as a general rule of thumb

if PCV is blocked aren't you meant to leave it vent atmo....in which case just put a filter on the empty port

If you plumb it back to intake, then put your PCV back in...

I found that out the hard way, it's the whole reason for asking. I was vent to the intake pipe but had massive amounts of low by in the intercooler pipes.

Hanaldo Grand Master

Hanaldo

Posted
Posted

Unblock the PCV and plumb it into the intake, the system works better like that.

You would be better off ditching that empty can to, even with steel wool they don't do a lot. I had one in my car for a good 2 years and there was never a drop in it, not even condensation. My new properly baffled catch can picks up a fair bit of condensation.

2.5T_/<ouki Contributor

2.5T_/<ouki

Posted
  • Author
Posted

Unblock the PCV and plumb it into the intake, the system works better like that.

You would be better off ditching that empty can to, even with steel wool they don't do a lot. I had one in my car for a good 2 years and there was never a drop in it, not even condensation. My new properly baffled catch can picks up a fair bit of condensation.

I would rather not. I run a blow-through setup so connecting back the PCV and routing my breathers back to the inlet would mean i would then have a vacuum leak at idle as the PCV is pulling in air from the valve covers through the breathers which are now BEFORE the maf as it's in blow through.

Also, I opened up my inter cooler piping and had TONS of oil/blow by so I'm almost positive a catch can will be better for my setup.

Hanaldo Grand Master

Hanaldo

Posted
Posted

I would rather not. I run a blow-through setup so connecting back the PCV and routing my breathers back to the inlet would mean i would then have a vacuum leak at idle as the PCV is pulling in air from the valve covers through the breathers which are now BEFORE the maf as it's in blow through.

Also, I opened up my inter cooler piping and had TONS of oil/blow by so I'm almost positive a catch can will be better for my setup.

Ah, fair enough then.

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