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Catch Can Oil Drain

2BNVS

By 2BNVS,
in Engines & Forced Induction

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2BNVS Veteran

2BNVS

Posted
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i have a catch can, with a return drain piece at the bottom. it is custom made on the passenger side up the back. i heard it is not possible to plumb it to the turbo oil return as there is pressure. is there a way around it keeping the can on that side. i was told to go to the dipstick but its on the other side as you would know

Cheers...Ben.

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Beer Baron Grand Master

Beer Baron

Posted
Posted

do you really need to return it to anywhere? I am not personally keen on returning catch tank stuff into my sump. it's usually watery/fuelly/oily stuff and aside from that there is usually bugger all in there. I empty mine about once a year and bugger all is in there.

you can T it into the turbo oil drain but it can be a bad idea as you most certainly don't want anything to fk that up as your turbo will quickly get fked if the oil drain gets blocked.

other than that you can drill and tap and put a fitting into the top of the sump and return it there but personally I'd just block it up and leave it.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

If the motor is in any reasonable condition it shouldn't be breathing that much anyway.

If you fill a small can in more than a month you've got some real issues.

Do you have proper baffling inside the can etc etc?

otherwise just a 'tin', there is no point having it drain back. Need to filter it first.

MBS206 Grand Master

MBS206

Posted
Posted

Mine will breath 800ML of oil within about ooo... 130KMs of street driving...

Yes, sump is well and truly topped up because I'd been at the track, and NO, I don't have any external (Including the factory) drains hooked up... These are my issues... :thumbsup:

2BNVS Veteran

2BNVS

Posted
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Posted (edited)

Ash: Was that directed to me? if it was, of course i think a catch can is beneficial thats why ive always had one. i just wasnt sure if it was better to have it draining back to the motor or not, as some friends have completely sealed up catch cans with the drain back to sump, and some have VTA ones with no drain.

I Dont get the claims about motor builds though, im not an engine builder i just get the feedback from a few very well respected engine builders who are on these forums.

Ben...

Edited by 2BNVS
STATUS Grand Master

STATUS

Posted
Posted
If the motor is in any reasonable condition it shouldn't be breathing that much anyway.

If you fill a small can in more than a month you've got some real issues.

Do you have proper baffling inside the can etc etc?

otherwise just a 'tin', there is no point having it drain back. Need to filter it first.

agreed.

STATUS Grand Master

STATUS

Posted
Posted

The issue with drain back systems is water contamination (read BEER BARONS post)

Overnight or over any period of time that the engine cools down condensation builds in the vents and lines (much like your exhaust), this vapor will also collect in the catch tank.... which then later drains into the sump... bad idea.

r33_racer Grand Master

r33_racer

Posted
Posted

Yeh thats what i thought was the case also with condensation and whatnot...but havent seen or heard of anyone having any dramas with that setup. Especially if oil is changed at correct intervals. Ill be setting my road car up like this once i sort out some new mods(atm no catchcan just lines running to ground). Breather from crankcase inlet side to catchcan, and drain to sump from exhaust side.

I have seen this setup before and there appears to have been no dramas with it.

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