Member Profile - Marcus' GT Spec B 6MT Wagon

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Dual Baffled catch cans - Bracket and Mounting

Postby marcus.bspec » Thu Nov 19, 2020 8:48 am

I managed to finally get around to a new dual catch can setup.

I purchased two Mishimoto Baffled and Filtered catch cans, one to run in-line with the breathers and the other for the PCV system.

I used an old FMIC bracket I had lying around to mount the cans behind the motor as there was really no other place the supplied mounts would work with. In a
way this was an advantage as it would eventually make routing the hoses much easier and cleaner.

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The GCG Turbo should be back with me today, and so I'll make the trip to Supercheap or Autobarn to grab some breather hoses, clamps and coolant to get this all buttoned up :)
2007 Subaru Liberty GT Spec B | 6MT Wagon | instagram.com/marcus.bspec

2019.06.20 - 146 kw atw
(tune booked OCT 2020)
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby bigBADbenny » Thu Nov 19, 2020 9:10 am

Good luck!

Get in touch if you want to try my improved dual can routing idea.

The catch can intercepts are pre pcv and sump breather hose.
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby marcus.bspec » Thu Nov 19, 2020 9:29 am

bigBADbenny wrote:Good luck!

Get in touch if you want to try my improved dual can routing idea.

The catch can intercepts are pre PCV and sump breather hose.


Will do! Hopefully there aren't any dramas with the turbo, car see's the dyno on Thursday next week!

I've been trying to get onto Matt to see when he's free to give me a hand flashing the ECU with the stock tune.

I'll see how the catch can setup goes and let you know. Would be cool to do a bit of a comparison :)
2007 Subaru Liberty GT Spec B | 6MT Wagon | instagram.com/marcus.bspec

2019.06.20 - 146 kw atw
(tune booked OCT 2020)
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby bigBADbenny » Thu Nov 19, 2020 12:11 pm

If what I know is correct, its simply a matter of reflashing your stock rom over Matt’s tune...
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby marcus.bspec » Thu Nov 19, 2020 1:15 pm

bigBADbenny wrote:If what I know is correct, its simply a matter of reflashing your stock rom over Matt’s tune...


I've been told 1000 different things, even from Matt in the past, he's agreed to give me a hand before Thursday via teamviewer.
2007 Subaru Liberty GT Spec B | 6MT Wagon | instagram.com/marcus.bspec

2019.06.20 - 146 kw atw
(tune booked OCT 2020)
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby Yowie » Thu Nov 19, 2020 1:41 pm

Nice catch can mounting solution. I'm a bit fan of using short simple hose routing where possible. That location will allow that.

The Mishi catch cans are a quality item, albeit with some improvements that can easily be made to the internal baffling/filtering.

Mishimoto also separately sell longer lower sections of the can if you have the available vertical space and/or you need more internal volume. Eg on E85 in winter my rocker covers catch can fills up with (mainly) water condensation at a great rate so a larger volume catch can is essential.

Will you be running a drain line from each of them or is "unscrew to empty" the plan? I recommend the drain line for convenience and low-mess.
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby marcus.bspec » Fri Nov 20, 2020 9:34 am

Nice catch can mounting solution. I'm a bit fan of using short simple hose routing where possible. That location will allow that.

The Mishi catch cans are a quality item, albeit with some improvements that can easily be made to the internal baffling/filtering.


Mishimoto also separately sell longer lower sections of the can if you have the available vertical space and/or you need more internal volume. Eg on E85 in winter my rocker covers catch can fills up with (mainly) water condensation at a great rate so a larger volume catch can is essential.

Thanks mate! Yes, half the reason I went with the Mishi cans was for this reason, I'll see how I go and make the call once I've had the chance to see how much they fill and at what rate they're filling up at.

Will you be running a drain line from each of them or is "unscrew to empty" the plan? I recommend the drain line for convenience and low-mess.


As for the drain, I'll simply unscrew and empty when needed, just for observations' sake, unless of course they're filling quite rapidly during spirited driving or during the colder months I might consider using the thread underneath currently blocked
by a blanking plug and replace it with an easy-drain plug attachment of some kind :)
Last edited by marcus.bspec on Fri Nov 20, 2020 9:43 am, edited 1 time in total.
2007 Subaru Liberty GT Spec B | 6MT Wagon | instagram.com/marcus.bspec

2019.06.20 - 146 kw atw
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby Yowie » Fri Nov 20, 2020 9:43 am

Easiest for draining would be a NPT-to-barb fitting on the bottom of each can, a length of rubber hose, then an ebay stopcock/ball valve with barbed ends. Available space will dictate wither that can be a short hose for draining while standing over the engine bay, or a long hose running down to level with the bottom of the gearbox. Go short if you can.

I don't recommend merging the two drain hoses to one stopcock in case the different vacuum/pressure in each can does weird things.
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby marcus.bspec » Fri Nov 20, 2020 9:47 am

Yowie wrote:Easiest for draining would be a NPT-to-barb fitting on the bottom of each can, a length of rubber hose, then an ebay stopcock/ball valve with barbed ends. Available space will dictate wither that can be a short hose for draining while standing over the engine bay, or a long hose running down to level with the bottom of the gearbox. Go short if you can.

I don't recommend merging the two drain hoses to one stopcock in case the different vacuum/pressure in each can does weird things.



Great idea, I'll definitely have a fiddle. I'm definitely happy that they're positioned where they are, heaps of space to fiddle with can sizing and draining.

Both cans are plumbed back into the inlet, but nonetheless if I do end up setting up drain hoses, they'll be seperate for sure :)
2007 Subaru Liberty GT Spec B | 6MT Wagon | instagram.com/marcus.bspec

2019.06.20 - 146 kw atw
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby Yowie » Fri Nov 20, 2020 10:25 am

Both cans are plumbed back into the inlet,


I assume:

(a) the crank gas goes through one can into the PVC valve on the manifold; and;

(b) the rocker cover gas goes through the other can into the pre-turbo pipe.

If not, I'm intrigued.
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby bigBADbenny » Fri Nov 20, 2020 12:19 pm

Personally, imho, on cars with dual head ports, tapping the CCV for AOS/CC is redundant.

Subaru went to huge lengths with these engines to improve the woeful oil control issues experienced in a track situation, extended high G’s leading to oil surge in the sump filling the outside corner head.

Everyone apart from Flatirons has missed the intent of the schema:

The CCV blows into the heads, via the so called balance pipes, to assist oil return to sump.

This effectively makes the CCV & heads part of the stock AOS setup, the heads forward PCV return ports being baffled.

The sump is scavenged from the breather port straight into the PCV/inlet (iirc).

So ideally the head return breathers and the sump emissions hoses will be the aftermarket AOS/CC inlets.

Subaru didn’t put a big AOS on the rear of the block for nuthin!

Anyway you heard it here first :P
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby Yowie » Fri Nov 20, 2020 12:41 pm

The sump is scavenged from the breather port straight into the PCV/inlet (iirc).


The sump gasses leave the sump breather port (just in front of the gearbox) and go into an F-shaped splitter (with internal restrictions). See image below.

Image

Under manifold vacuum the dirty air goes to the PCV valve on the inlet manifold.

Under manifold boost the PCV valve closes and the dirty air is drawn into the pre-turbo pipe.

Either way, the crank gas is filthy with water vapour and oil that I would rather catch (most of) before it goes into the manifold or the pre-turbo pipe. That's why I put a catch can after the sump breather port and before the splitter.

[Some people only care about gunk in the intercooler, so they insert the catch can on the pre-turbo pipe side of the splitter and let whatever rubbish directly into the manifold.]


I can't claim to fully follow your explanation above (diagrams & exploded images usually help my understanding of all this hose routing) but I see plenty of value in adding a catch can after the crank vent just based on the rubbish I collect from that spot.
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby bigBADbenny » Fri Nov 20, 2020 4:23 pm

Love it.
Best start my own thread rather than clog this one! :P

Over here indeed:
viewtopic.php?f=6&t=36572&p=449434#p449431

:P
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Re: Member Profile - Marcus' GT Spec B 6MT Wagon

Postby marcus.bspec » Sun Nov 22, 2020 12:14 am

Yowie wrote:
Both cans are plumbed back into the inlet,


I assume:

(a) the crank gas goes through one can into the PVC valve on the manifold; and;

(b) the rocker cover gas goes through the other can into the pre-turbo pipe.

If not, I'm intrigued.


Great job on the other thread guys, seems to be a lack of information regarding this particular topic here.

But yes Yowie you are correct, a very simple setup, the pipe originally connecting both head breather ports that plumbed back into the inlet was horribly gummed up, I've simply added a can into the system and freshened up all of the hoses and clamps for OCD's sake. :lol:
2007 Subaru Liberty GT Spec B | 6MT Wagon | instagram.com/marcus.bspec

2019.06.20 - 146 kw atw
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