venting catch cans

[Pube]

After rebuilding my 1GGTE and just clocking up 1000k's I have noticed the same problem I had before the rebuild, im getting more than normal amounts of oil in my catch can. Im using 1GGE cam covers as I have a 1G water to air intercooler sitting on top of the engine. The catch can is plumbed into a rocker cover and the other line into the intake. As im using the 1GGE cam covers, the baffling inside the cam cover is not the best as its designed for N/A.

The vent on the catch can is plumbed back into my intake before the turbos, could it be possible for the oil to be being sucked out of the cam cover instead of just venting from the cam cover? The oil is more noticable when I have been driving on longer stretches of road around 100km/h where the RPM is higher for longer periods of time. Not so noticable when just putting around the streets.

I could just put a little filter for a breather on the catch can but keeping things legal and all, would a restrictor in the line back into my intake be worth while trying out? This would try and slow down any possibilities of oil being sucked from the cam cover?

Just a little converned to get this sorted before heading to Dubbo.

[Howieau]

Im not too familiar with the 1GGTE, but I think blocking off the pipe from the catch can to the air intake would be a good step to diagnose the problem. If it doesn't change youll know to start looking into other possibilities, such as perhaps; new rings still wearing in, perhaps before the rebuild one of your piston's rings/ringlands was fudged. Did you re-use the same pistons, sure they were all fine etc. But one thing at a time, block that pipe off and go from there.

[thechuckster]

maybe set up a PCV valve to actively evacuate the catch-can vapour during moments of high vacuum in the inlet? would be better than a simple line with a restrictor in it (e.g. would cope with boost).

[The Real Roadrunner]

or put better baffling in the cam covers, wouldn't it be better to stop oil usage rather than just bandaid it? can you run the proper W-A cam covers? these are designed for turbo applications which shouls mean that the baffles are more suited.

cheers
linden

[GA65CELICA]

It sounds like you have them same set up as i used to have. I think you are on the right track with the oil being sucked out off the rocker covers. I found that my catch can was filling up fast and kept thinking the rings were no good or something. I took the hose off from the can to the intake and put on a filter so it can go to atmosphere, i cant see how it is illegal if you have the oil vapour go through a filter. The oil/water i found in the catch can after this was greatly reduced to what i would call normal for a turbo engine, about 100ml per 5000km service. good luck

[Steve M]

For legality, the post can vent must be plumbed bach into the inlet system. filters to athmosphere are not legal as far as I know.

[big_zop]

I took the hose off from the can to the intake and put on a filter so it can go to atmosphere, i cant see how it is illegal if you have the oil vapour go through a filter...

It is illegal because of emissions and safety reasons. Not sure of the exact emission rule but could you imagine a container full of oil with an open top in a hot engine bay - small g-forces would be enough to cause a spill and potentially a fire. And i hop that the water you are finding in your catch can isnt coming frmo the engine otherwise you have a BHG...

Pube - is the catch can retuning back to the sump or not? Not sure if this would affect it. Also what is the general layout of the setup (do you have gauze in the can, baffles, does the entry line come in at a tangent to enable better air/oil separation)?

There is a little info on what i am talking bout in the dry-sump tech thread - post #2 & #61
http://www.toymods.net/forums/showthread.php?t=15804

[Pube]

double post

[Pube]

Using the 1GGE cam covers over the 1GGTE water to air covers cam down to availability at the time as I could not locate any water to air covers. The 1GGE covers are just to shallow to get any more baffles in there other than the factory 1GGE baff that are already there.

My catch can in just a simple can with two openings on the top. No baffling in the can but it seems to be doing its job separating the oil from the air as im not getting any in the intake. Its not returning to the sump, however I have an AN fitting welded to my sump ready for a return line if needed but im not sure if this will cause the sump to pressurise?

Id rather not vent to atmosphere as I want it all legal but im not sure how to combat this prob otherwise.

[Pube]

Using the 1GGE cam covers over the 1GGTE water to air covers cam down to availability at the time as I could not locate any water to air covers. The 1GGE covers are just to shallow to get any more baffles in there other than the factory 1GGE baff that are already there.

My catch can in just a simple can with two openings on the top. No baffling in the can but it seems to be doing its job separating the oil from the air as im not getting any in the intake. Its not returning to the sump, however I have an AN fitting welded to my sump ready for a return line if needed but im not sure if this will cause the sump to pressurise?

Id rather not vent to atmosphere as I want it all legal but im not sure how to combat this prob otherwise.

[IN 05 NT]

you could fit a return to the sump.

[thechuckster]

you could fit a return to the sump.

this is a bad thing - you don't want the crud that collects in a catch can to return the engine.

[MWP]

this is a bad thing - you don't want the crud that collects in a catch can to return the engine.

It shouldnt be any dirtier than the oil in the sump... if it is, youve got other issues.

[YLD-16L]

this is a bad thing - you don't want the crud that collects in a catch can to return the engine.

My catch can has never had anything in it other than a light film of oil when I have looked.

It's been draining back to my sump for about 8 years now without any issues what so ever and saves me the hassle of ever having to drain the can.

With a baffled cam cover/breather port I see next to no oil pass into the can other than vapour. I run clear breather hose too so I can see exactly what is going on

[The Real Roadrunner]

if you want the proper W-A covers i have some here. 90% of problem solved right there.
i always run a drain / vent on the sump that way you relieve pressure from the entire engine and it doesn't have to push the air back up the oil returns in the head, never had a problem yet.

cheers
linden