Oil catcher for SVX

[Vlad772]

Hi there,

I've got an oil in the inlet air pipe. It comes form the carter ventilation system (it might be an extra pressure there). I've seen oil catch tank suitable for WRX or STI. Does anybody has any expirience with it?

Thanks in advance.

Vlad

[BoxerFanatic]

I would think an air/oil separator canister that works on an EJ would work on an EG... if it can be attached in much the same way.

Maybe this would work, also.
Air/Oil Separator - Subaru - GrimmSpeed
(http://www.grimmspeed.com/catalog/product_info.php?cPath=91&products_id=191)
http://www.grimmspeed.com/images/product_images/aos_300_1.jpghttp://www.grimmspeed.com/images/product_images/aos_installed_used_hoses_600.jpg

Although that is a bit expensive, at 300$

[LetItSnow]

That piece has also been determined to not work with the Subaru NA system. They're working on something to suit our (your? :lol: ) needs.

[Vlad772]

That piece has also been determined to not work with the Subaru NA system. They're working on something to suit our (your? :lol: ) needs.

I found the similar one but I concerned about its usability on NA engine. The price is about 60$, not too much to have a try:) Otherwise the question is still opened.

[LetItSnow]

Somebody, please correct me if I'm wrong.

In its naturally aspirated state, the SVX's H6 and your everyday H4s effectively require two catch cans to cover the whole system - one for the valve covers and one for the PCV system. The question has been raised on NASIOC as to whether the valve covers actually need a catch can at all.

A 2-to-1 like the oil cap shown above might have merit in that the valve covers could merge there, then lead to the intake in one location, with the other former hose connection capped off.

This is surely a legitimate concern; when I removed my intake manifold, it was a lot like others I've seen... full of oil!

Got a link to the $60 one, fwiw?

[SilverSpear]

Somebody, please correct me if I'm wrong.

In its naturally aspirated state, the SVX's H6 and your everyday H4s effectively require two catch cans to cover the whole system - one for the valve covers and one for the PCV system. The question has been raised on NASIOC as to whether the valve covers actually need a catch can at all.

A 2-to-1 like the oil cap shown above might have merit in that the valve covers could merge there, then lead to the intake in one location, with the other former hose connection capped off.

This is surely a legitimate concern; when I removed my intake manifold, it was a lot like others I've seen... full of oil!

Got a link to the $60 one, fwiw?

I logically agree on that the PCV requires a catch can whereas the valve covers not.

And why not merging both banks into one inlet and buying a cheap (<$80) catch can instead of paying $300 for an "extra terrestrial" one?

[sicksubie]

Which is what I have done on my car.. I have a Greddy catch can located where my battery used to be with both banks merged into a single inlet. On the outlet side I have a K&N crankcase vent filter just venting to the atmosphere. I no longer have the PCV to worry about either...

[Vlad772]

Got a link to the $60 one, fwiw?

Here it is:
http://cgi.ebay.at/Oil-Catch-Tank-Ol-Auffangbehalter-Subaru-WRX-ST-Impreza-/400132636868?cmd=ViewItem&pt=Autoteile_Zubeh%C3%B6r&hash=item5d29c380c4

[Boxersix]

Give me about a week guys and I'll show you an AOS ventilation tank I'm working on for the EG33 PCV.

Point being....PCV system is for emission. Those that say that the vacuum created by the PCV creates power.......true and not so true. Crankcase vacuum creates power, but for the average motor not until you see levels in the 10"hg range which the PCV system cannot create in any operational level of the motor that makes any benefit. You need an external source of vacuum to provide this like a vacuum pump used an many top fuel motors.

The problem is that too much case vacuum is bad and one must be cautious in doing so.

Most will suffice with a simple catch can with case lines run to it, PCV manifold port blocked. The issue with this is oil consumption(rather oil "trappage" in the tank as I called it). Its a big problem on the EJ motors and why the AOS's options are being made(by which the Crawford one is the only one I find to truly work, and I've tested nearly all of them out there).

A true functioning AOS is the trick, and something I'm working on right now for my car as I'm smack in the middle of some manifold/fuel system work and too wanted to nix the oil issue in the butt.

Parts are on order and should be here mid week. I'll show you what I can offer as a solution for a fair price.

[Boxersix]

Sorry, AOS and oil pan work got put on hold. had to pull GTR into shop for work for a race on 8/23. Will be back asap with work photos for you guys :)

[LetItSnow]

Used Perrin catch can: $50
Hose, clamps, adapters and one bolt: $12ish
http://i176.photobucket.com/albums/w187/LetItSnow_photos/SVX2/2010/08/06/th_IMG_2655.jpg (http://s176.photobucket.com/albums/w187/LetItSnow_photos/SVX2/2010/08/06/?action=view&current=IMG_2655.jpg) <-click

New is new, but some Simple Green and replacement of the sight hose makes this zero technology piece look as new.

Before the install, I'd replaced the hose between the "F" on the back of the top of the block and the air box with clear hose, and it was turning brown within a week!
http://i176.photobucket.com/albums/w187/LetItSnow_photos/SVX2/2010/08/06/th_IMG_2656.jpg (http://s176.photobucket.com/albums/w187/LetItSnow_photos/SVX2/2010/08/06/?action=view&current=IMG_2656.jpg) <-click

[cdigerlando]

I have done everything on my EJ and my EG from venting with filter to atmosphere, to a catch can with a small hose extended to the bottom of the can with a filter on the interior to help with separation. I have driven about 60k on the WRX with the can and the clean up in the can was minor. I have yet to open up the intake to see if it is clean though. I used to just vent my EG motor, with no problems, but I will probably go with the can. The EG motor was so filthy after opening up the intake, when I got the WRX new, I immediately installed vent filters, so it should be clean.

[Boxersix]

Alright I need to take pictures of the AOS I made for this EG33 here so you guys can see what's going on. It's not fully plumbed in as I had to scrounge some of my cars AN supplies for another build here but I can point all that out.

It's probably not something that'll fit into the bay of the SVX but it 100% guarantees no oil will enter the intake system, while at the same time 99% guarantees no oil loss from spewing out a filter or becoming entrapped in the bottom of a tank(recylces the oil back to the crankcase)

I'll bring the camera to work tomorrow and snap a few shot of it, have it online later that night.

[LetItSnow]

Three weeks after the single can shot above... you can see that it's working, and that it's got work to do!
http://i176.photobucket.com/albums/w187/LetItSnow_photos/SVX2/2010/08/29/th_IMG_2691.jpg (http://s176.photobucket.com/albums/w187/LetItSnow_photos/SVX2/2010/08/29/?action=view&current=IMG_2691.jpg)

[SilverSpear]

Rob, nice work. But I recommend you change those hoses to soemthing more decent looking...

Black is good :rolleyes:

[LetItSnow]

C'mon, you know better! ;) The clear hose is temporary, to show that there's definitely junk going in and filtered air coming out, justifying the cans.

Naturally, I can't vouch for whether an NA engine would need both as well. It's an easy experiment for anyone who wants to take it on!

[Boxersix]

Well for what it's worth here's a simple shot of the AOS on my car. Not 100% complete yet, and not plumbed but sitting in the rough spot against the firewall. This is a similar system I make for other non dry sump race motors I build and/or setup. Whipped this one up form some scrap kicking around the material bins.

http://i123.photobucket.com/albums/o285/Boxxersix/AOS.jpg

Stainless, triple chamber, heated. There are three inlets(you can see two on right, there's one of left with no fitting on at the moment). 8AN size, two come from the valve covers, one from the oil cap or oil filler neck. Those inlets dump into the main chamber(bottom area of tank) where the oil vapor must pass set number of baffles. This allows heavy oil to collect on the walls and drip to the base. The vapor then passes through a second chamber, also baffled, then onto the final chamber filled with stainless packing before exiting the tank through the filter. All residua oil is collected and runs down to the base of the tank, when it feeds to the 12AN return line back to the crankcase.

There is no PCV in this and nothing returns back to the inlet. Manifold port is plugged and I have a non-oem inlet pipe up to the throttles. Emissions friendly...hah....no :ninja:

The tank is also heated. Typically I would fab a stainless coil into the tank that has coolant flow through it. This one has a small 12 volt electric element because I needed it to be quickly removable, and draining coolant is far from quick on this car. The heater is there to prevent condensation in cooler weather. On non heated return type AOS setups condensation can build and you don't want that returning back to the motor.

I've built these setups for quite a few racecars and they work excellent. Crawford actually makes a similar setup for the EJ motors, heated and all. Far overkill for most daily drivers and the above catch tank setup pictured by the other members is just fine for 99.999% of you guys. Just wanted to post this here regardless :)