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Old 10-22-2012, 05:46 PM   #26
JDwhiteWRX
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Quote:
Originally Posted by WRXt4cy View Post
From what I understood from reading through the huge AOS/Catch can thread that is out there is that the top port of the PCV that goes through the white sensor and into the the inlet is always flowing air in the direction from the inlet to the crankcase. Under manifold vacuum, the side port of the PCV has a very strong draw from the intake manifold port that is under the throttle body so this is a source of oil vapor getting into the manifold directly. When I took off my throttle body to install this catch can setup, I could see a pool of oil inside my intake manifold, right below where this port is tapped. When the manifold is under pressure, the PCV closes and the positive pressure causes the air in the crankcase to flow into the heads and out from the top ports on the valve covers.

So the "blow by" comes out of the valve covers during boost and is caught in one catch can. The only other oil vapor present in the breather system is during vacuum and comes from the intake port to PCV connection and this is caught by the other catch can.

Again, this is not my explanation of how the breather system works; this my own understanding from reading through lots of information and I believe it to be accurate. When I was running the G/S AOS, all my oil vapor seemed to come from the heads. The crankcase hose would get oil on the AOS side as if it was drawing from the AOS and picking up some oil vapor so this seems to fit with out the system seems to work. The G/S AOS completely ignores the PCV to intake manifold hose which seems to be the more import crankcase hose to put a catch can on.
Great explanation, thanks! need to do some reading on this.
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Last edited by JDwhiteWRX; 10-23-2012 at 05:56 PM.
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Old 10-23-2012, 08:39 PM   #27
JDwhiteWRX
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I have been thinking about this some more and I am wondering if the catch can between the PCV and intake manifold would get pressurized under boost? sure the valve in the PCV will close but not before the catch can gets pressurized. Maybe its a good idea to install a check valve between the intake manifold and catch can? or maybe its ok to pressurize the catch can?

Actually I think the real solution is to put the can between the block and PCV.
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Old 11-27-2012, 11:07 PM   #28
tonyp1974
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Anyone know if these will fit on an 02? Ive been looking for a kit to fit on the 02 but I havent found any.
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Old 11-27-2012, 11:49 PM   #29
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Originally Posted by tonyp1974 View Post
Anyone know if these will fit on an 02? Ive been looking for a kit to fit on the 02 but I havent found any.
02 kit is coming. They developed them on my car a few months ago.
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Old 11-28-2012, 07:11 AM   #30
tonyp1974
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Ugh....build is happenning now!!
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Old 11-30-2012, 10:22 PM   #31
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Just build your own catch can set up fellas
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Old 03-21-2013, 08:49 AM   #32
RallySoob
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so is this the best catch system? Better than crawfords heated system? I live in oregon and go snowboarding a lot so the freezing of catch cans is a fear of mine. Will these freeze ? Crawford addressed this issue with heaters as mentioned

Also, crawford Q&A mentions that yellow gunk as seen in your picture above. That is normal. You throw it away. You can read exactly what it is and why on their website
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Old 03-21-2013, 10:38 AM   #33
jnorth85
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I Installed this kit in my GC chassis car we will see how it works!





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Old 04-01-2013, 08:59 PM   #34
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How are you guys draining the cans? I installed the 85510 last weekend in preparation for this weekends track time and I can barely get my hand in there to turn the valve, let alone put a bottle or can to catch the fluid. I am thinking of running a hose from each can down and using a drain pan to catch everything.
Thoughts?

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Old 04-17-2013, 11:22 AM   #35
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Just had a track day with my Moroso dual catch setup and wanted to post my results. I really beat on the car for 150 miles on the track and this is the result:

My crank vent had a milkshake of slightly yellow crap, and my have been frothy as I checked it right after getting off the track. Anyone know what this junk is, I had no noticeable oil consumption.

The head vent had just a bit of oil, what I would expect.



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Old 04-17-2013, 02:57 PM   #36
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Doesn't coolant + oil = milkshake?
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Old 04-17-2013, 02:58 PM   #37
vision.dynamix
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Oil + water of any kind. Condensation, usually, when found in catch cans.

That post reminds me I have 2 Moroso cans full of milkshake sitting in my garage..
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Old 04-17-2013, 03:00 PM   #38
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Quote:
Originally Posted by vision.dynamix View Post
Oil + water of any kind. Condensation, usually, when found in catch cans.

That post reminds me I have 2 Moroso cans full of milkshake sitting in my garage..
It is an E85 setup, only 13k on it, oil analysis shows no coolant. Probably mostly water vapor.
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Old 05-01-2013, 04:17 AM   #39
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If anyone is looking for this setup, I have a slightly used setup, asking $250 shipped....
Also for sale on ebay user name ( Tyconway 100% feedback 220 plus sells)




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Old 05-20-2013, 09:46 AM   #40
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Just installed this kit this weekend. Relatively involved install. Give yourself 2 hours to install everything and button everything down. Only put on 250miles on the car so far and have not checked the levels. Will do so this week to gauge how often I should empty.

Helpful tip...use a hairdryer to warm the rubber hoses before fitting over barbed lines...makes it easier.
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Old 05-23-2013, 09:40 PM   #41
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Quote:
Originally Posted by evoq007 View Post
Just installed this kit this weekend. Relatively involved install. Give yourself 2 hours to install everything and button everything down. Only put on 250miles on the car so far and have not checked the levels. Will do so this week to gauge how often I should empty.

Helpful tip...use a hairdryer to warm the rubber hoses before fitting over barbed lines...makes it easier.
I little silicone lube helps too
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Old 05-24-2013, 11:31 AM   #42
castle1977
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has anyone used these on a 2003 wrx yet? i know they say a kit is in the works, im looking for someone that did a custom install.
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Old 10-15-2013, 04:04 AM   #43
BJJMark95
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I know this thread is a bit old. It I am looking at doing the moroso aos in my sti and was simply wondering if I could get some feedback on the difficulties of emptying each system? The small cans and the large cans? It would appear to me at first glance that the small cans would be because they give a bit more room to work. However they do have to be unscrewed so this was my concern.

Thank you for this thread tho. This is all great information and reviews and pretty much sold me on the Moroso system over the Crawford.
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Old 10-15-2013, 08:47 AM   #44
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Quote:
Originally Posted by BJJMark95 View Post
I know this thread is a bit old. It I am looking at doing the moroso aos in my sti and was simply wondering if I could get some feedback on the difficulties of emptying each system? The small cans and the large cans? It would appear to me at first glance that the small cans would be because they give a bit more room to work. However they do have to be unscrewed so this was my concern.

Thank you for this thread tho. This is all great information and reviews and pretty much sold me on the Moroso system over the Crawford.
With the stock intercooler, you will have to have a bit of dexterity to empty the catch cans, but it is not an impossible task. I find it easiest to stand on the passenger side and use my left hand palm facing me to slide down and grab the knurled side of the catch cans to get them started. When you tighten them up back them off just a fraction of a turn so they are easier to remove later.

With a bit of practice you can easily remove and check both cans while the car is fueling up at a pump.

If you have a Grimspeed intercooler you get a lot more room to work with and it is a pice of cake. Same goes for front mount.

I am not sure which you consider to be the small or the large ones, but the 85510 is just the right size for me in consideration to both ease of accessing them and having enough capacity to not have to empty them all the time.
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Old 10-25-2013, 05:23 AM   #45
BJJMark95
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Thank you - yes the ones I am looking at are I believe they say 25-30% smaller and are the 85645s
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Old 12-11-2013, 04:15 PM   #46
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These cans are beautiful... I've been looking into ventilation systems for my motor build and these seem like the best choice. Awesome baffling & separate cans for crank case/heads. I need to get me a set of these.
I would be possible to get AN fittings and run braided lines since I'm getting AN fittings installed on my heads & block. WIIICKED.
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Old 03-19-2014, 03:01 PM   #47
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I've been watching the top mount 08+ kit, and finally pulled the trigger today when I saw it on Amazon for $255.
Moroso 85645 Air and Oil Separator for Subaru STI : Amazon.com : AutomotiveMoroso 85645 Air and Oil Separator for Subaru STI : Amazon.com : Automotive
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