Oil Catch Can setup on AU I6

[TheSneakiness]

Evening all...

Anyone got a oil catch can setup on their AU I6? If so, how did you have it all plumbed and ready to go?

Pics would be good too.

[robbo_yobbo]

I set one up. It was a 2-in catch can, and I fitted a breather filter in the lid, both the front and rear rocker cover hose run to the catch can, and still allow (+)'ve crankase pressure to be released.

I have a custom intake on mine, but if you have the standard intake, you will need to plug up the niblett on the intake where the rear rocker cover hose runs to.

For the front one, I just removed the PCV valve and hose completeley and bought a rubber walking stick cane tip from clarke rubber, which I cut the end off , and that fit in perfectly where the PCV valve was and ran a hose from there to catch can.

the other end of the hose that goes to the intake manifold needs to be blocked too, or the car will run very strange from the lower intake pressure.
I removed the plastic plug on the manifold (it had the PCV hose and the fuel vapour purge hose on it) and put another small rubber walking stick cane tip over the niblett there to plug it, and just ran the fuel vapour hose into the airbox instead.

I managed to find room on the drivers side behind the power steering pump. I mounted the bracket for the catch can onto the ABS bracket.

Id post a pic but Ive removed everything from under the hood for a respray, but I did post a pic of something else under the hood a little while ago while I was half way through installing the catch can, Ill see if I can dig that one up and if you can see the catch can clearly in it.

[robbo_yobbo]

Yep, here it is, you can see where the catch can is on the left, and the rear hose, the front hose isnt on in the pic tho. dont put the PCV valve back in, in the picture Ive used the top of the PCV valve for the elbow which is stuck into 1/2 a rubber walking stick tip, you need a straight through piece of pipe on the front or the pressure cant escape which is why the PCV valve wont be any good. Alternativeley, if you drill out the center of your PCV you can put it back in or find something else that fits in niceley.


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[TheSneakiness]

Thanks for that robbo.

[JC]

I ran one on my V8 - line from PCV to catch can, and line from catch can to where PCV line used to go. Nice and legal, and does the job.

[ClassicAU]

I have seen these things on a few cars lately, but am not 100% sure of their purpose. May i ask what gains, if any, are to be had from installing an oil catch can? What do they do exactly?

Evan

[private9]

Originally Posted by JC

I ran one on my V8 - line from PCV to catch can, and line from catch can to where PCV line used to go. Nice and legal, and does the job.

Plumbed this way, does that mean that the oil separated was returned to the engine, or did you still have to drain the catch can from time to time?

[JC]

Originally Posted by private9

Plumbed this way, does that mean that the oil separated was returned to the engine, or did you still have to drain the catch can from time to time?

Only the fumes are returned - the oil stays in the catch can.

[JC]

Originally Posted by ClassicAU

I have seen these things on a few cars lately, but am not 100% sure of their purpose. May i ask what gains, if any, are to be had from installing an oil catch can? What do they do exactly?

Evan

It means no/less oil being mixed with the air fuel being burnt = cleaner burn. I got mine for $30, and I wasn't chasing performance, just rice.

[RG]

Originally Posted by JC

It means no/less oil being mixed with the air fuel being burnt = cleaner burn. I got mine for $30, and I wasn't chasing performance, just rice.

JC if you can be bothered could you possibly PM me a quick rundown on the install process to fit one to mine. I've noticed a fair bit of oil leakage where the line from the PCV into the upper manifold goes.

[JC]

Originally Posted by RedXR347

JC if you can be bothered could you possibly PM me a quick rundown on the install process to fit one to mine. I've noticed a fair bit of oil leakage where the line from the PCV into the upper manifold goes.

No worries - hopefully a picture is worth 1000 words! Basically, all the catch can is doing is intercepting the line from the oil filler neck to the TB.



On mine, with the aftermarket covers, it's all from the same side of the engine bay. I think for the stock covers, your line to the catch can will just be longer. On the V8s, I suppose it's not really from the PCV valvle, but the outlet on the oil filler neck. Still, does the same thing.

[RG]

Sorry to hijack the thread but JC mine has a oil mark on the underside of the upper manifold on the drivers side. It is the line from the PCV to the upper that then runs to under the brake master cylinder. Any ideas?

[ClassicAU]

Just found this quote while doing a search. Its from one of the E-Series guys, it explained it for me, just incase anyone else was wondering. I think it only applies to the I6 though.

Originally Posted by Rollin

the PCV valve opens under vacuume from the manifold or pressure in the crankcase exceeding pressure in the rubber hose. if you apply boost to the engine leaving the PCV hooked up the way it is now it will pressureise the motor as others have said.

the best way to hook it up is to have a twin entry and single exit catch can, run a hose from the PCV valve to the can, and then another from the rear rocker cover vent to the can, then the final hose from the can to the intake manifold before the throttle body (in an NA car) or before the turbo/supercharger (in a blown car)

ideally the catch can should have some form of baffles or other material in it to seperate the oil from the air, so that the oil sits in the can and the 'clean' air goes into the motor. part of a stocking with a couple of stainless steel dishwashing scourers is good to use as a baffle, though make sure you use the little spiral jobbies, not the ones made of very small metal fibres.

having any part of the PCV system venting to atmosphere is illegal, and it wont really give you a horsepower increase IMHO.

[JC]

Originally Posted by RedXR347

Sorry to hijack the thread but JC mine has a oil mark on the underside of the upper manifold on the drivers side. It is the line from the PCV to the upper that then runs to under the brake master cylinder. Any ideas?

Nah, sorry. Who rebuilt your motor? I'd be asking them to take a look as it sounds like one of the pipes may have worked loose.

[RG]

Originally Posted by JC

Nah, sorry. Who rebuilt your motor? I'd be asking them to take a look as it sounds like one of the pipes may have worked loose.

All the pipes are OK it's just blowing a bit of oil into the inlet manifold which is apparently common on these. Anyone know if you can get a two line in two line out catch can?

[robbo_yobbo]

Originally Posted by ClassicAU

I have seen these things on a few cars lately, but am not 100% sure of their purpose. May i ask what gains, if any, are to be had from installing an oil catch can? What do they do exactly?

Evan

no point if your after power gains, but gives you a place to rout your plumbing if you have a custom intake, and keeps oil out of your manifold (not that you should be gettin much in there anyway. basicaly they catch any oil that spitsout of the crank case breather hoses

[ClassicAU]

Originally Posted by robbo_yobbo

no point if your after power gains, but gives you a place to rout your plumbing if you have a custom intake, and keeps oil out of your manifold (not that you should be gettin much in there anyway. basicaly they catch any oil that spitsout of the crank case breather hoses

I didnt think it gave you any more power anyway, but from what i have been reading they are worthwile for longevity as apparently the intake manifold gets fairly dirty after time on the 4 litre motor. I do like the idea of it being a solution to having a custom cai setup too. At the very least, it will give me something to do one weekend if i am bored! :P

Evan

[robbo_yobbo]

Originally Posted by ClassicAU

At the very least, it will give me something to do one weekend if i am bored! :P

Evan

Now thats the Attitude we all like to see! Modifications just for the sake of it! I like the way you think.