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Old 11-14-14, 06:49 AM   #1
Neanderthal Racing
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Default aos systems - to splooge or not to splooge

there are six aos manufacturers that are typically referenced on iwsti. these are the links to the manufacturers' respective sites. the first four are in no particular order. i placed moroso and element last. i left all the detailed information entirely up to the manufacturers to explain on their own product pages. what you see is what you get from them:

grimmspeed:
Air/Oil Separator - WRX/STi/LGT/FXT - GrimmSpeed

crawford:
Separator

iag:
http://www.iagperformance.com/SearchResults.asp?Search=iag+aos&Submit=

perrin:
http://perrinperformance.com/i-14908570-air-oil-separator-for-wrx-sti.html

moroso:
Air-Oil Separators

element:
Element Competition Catch Can

the first four products all share one thing in common; they all return oil to the crankcase, which is a huge improvement over delivering that crap into the intake via the pcv. back in prehistoric times ('04-5), we only had one choice; which catch can to buy. if youve ever emptied a catch can after a hard track session, youve seen what comes out of it. it is a disgusting froth of broth and vapor product whipped up by your spinning crank. if i poured you out a cup of it and said to you, i want you to pour this back into your engine, you would protest, tell me i was nuts and to fuck off. that's pretty smart.

some of these aos systems look better than others. beauty is in the eye of the beholder. for the sake of argument (and whether it is true or not) lets say they all six work equally well. of course they don't but lets say they do for now. i'll let you guys slug it out in the thread.

let's also say, of all six, the moroso and element units are the ugliest units in the pile. it's actually a fair statement to make re: the element unit. the one thing that the moroso and element units will let you do that the other four don't is, empty that cup of splooge somewhere else. you decide where, but once you look at it, you won't pour it back. the only downside is, you can't plumb it and forget it. you can't be lazy. you have to empty it. the element unit is designed for high hp/boost engines. it may not be the most appropriate unit for less ambitious applications.

when i started the thread, the search feature gave me a list of other aos threads on aos systems:

https://www.iwsti.com/forums/vendor-a...illet-aos.html

grimmspeed AOS vs crawford AOS - review

Crawford Air/Oil Separator - Top 10 Questions To Be Answered

https://www.iwsti.com/forums/vendor-a...illet-aos.html


it won't be lost on anyone that element is a sponsor of mine. as usual, i'll probably continue to edit this first post. if i'm missing a manufacturer, post something and i'll add it. also as usual, i'll try to sit back and let others pick up the discussion. i know that all of these manufactures have fan bases here on iwsti. i expect you to defend your favorite product and i hope you do. i know you will. respect to you all.
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Old 11-14-14, 06:59 AM   #2
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Default Re: aos systems - to splooge or not to splooge

Info is great to have in one spot. The MOROSO does not return the oil back. For the subarus it is a ball valve on the bottom for emptying catch cans via tubes or just a cup. You could yes try and run it back to the crank case and leave the valve open but that is not how it was designed to function

These have worked flawlessly at what they are meant to do in all of our testing
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Old 11-14-14, 07:11 AM   #3
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Default Re: aos systems - to splooge or not to splooge

I ran the Peterson catch can for 5 years (which I assume is what Element Tuning rebranded) and I have had no regrets switching to the IAG AOS when they released it.

1. The IAG AOS had 3 ports so it relieves crankcase pressure a lot more efficiently.

2. The turbid, milky stuff I empited from the Peterson catch can was predominantly during winter time whereas in the summer it was more clear oil consistency which can be attributed to the climate change. Keep in mind that the catch can is not heated so that is why it is milky in the winter. The IAG AOS is heated with coolant so it will retain the clear oil consistency year round and that is the stuff that goes back into the crankcase. The heated coolant perfusion design of the IAG AOS is the most uniform throughout the can and superior to Crawford and Perrin.

3. Furthermore, since the IAG AOS actively empties, the oil will not sit around in the can itself to even have a chance to condense into that frothy substance.

4. The Peterson catch can had a chance to fill up with oil on hard cornering G's on the track and this sequestered the oil into the catch can and deprives your motor of oil. The IAG AOS will return that oil quickly back into the crankcase.

5. The Peterson catch can left oily residues in the adjacent structures which initally escaped from the breather filter. Not only was it an eye sore but could potentially pose a fire hazard. Moreover, the fumes emitted from the oil sitting in the catch can was nauseating for my passengers even though I was acclimated to it.

Last edited by user1029; 11-14-14 at 01:27 PM.
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Old 11-14-14, 07:15 AM   #4
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Default Re: aos systems - to splooge or not to splooge

Quote:
Originally Posted by JS Auto Designs Jake View Post
The MOROSO does not return the oil back.
correction made. thanks, js. i blame any confusion on moroso for not having a better and more detailed description of the unit on their product page.
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Old 11-14-14, 07:18 AM   #5
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Default Re: aos systems - to splooge or not to splooge

No worries just want to make sure there wasn't confusion.
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Old 11-14-14, 08:00 AM   #6
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Default Re: aos systems - to splooge or not to splooge

I've had the ugly Moroso's on my DD for about two years with no regrets (other than getting to the drain valves with my big hands).
Everything said by everyone above seems accurate to me. I think they all get the job done, it just comes down to personal preference: some people like Subaru's, others Chevy's. Both do the job, just with different style.
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Old 11-14-14, 08:04 AM   #7
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Default Re: aos systems - to splooge or not to splooge

Another misconception that often follows these devices (and there are boatloads of them out there) is that the 'goo', 'peanut butter', 'froth', or whatever you want to call it is bad. It is not. It is a byproduct of temperature variations, oil, combustion and so on. It has been around for well over 100 years and has never once been determined to cause and negative issues with oiling. In fact, it is found on nearly every surface on the inside of an engine. It will be found less on components that remain mostly hot (rods, pistons, etc.) and more on those that are more directly in contact with ambient air temps (PCV lines, oil fill tube, valve covers, etc.).

Personally, I am a fan of a well designed A/O separator as they keep more oil where it should be, in the sump. I've seen far too many times can setups that are done improperly; filling in 20 minutes of track time, or worse, overflowing and causing a fire. Just about once a month I get a 'why is my catch can filling up' e-mail. A well designed A/S separator will work well for 99.6% of the applications out there and require zero attention after installation.

Of course the top priority of any of these devices should be not allowing oily vapors into the intake tract.
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Old 11-14-14, 08:08 AM   #8
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Default Re: aos systems - to splooge or not to splooge

I can only speak about my own experiences with the moroso unit, used now with 4 track weekends and multiple auto crosses. With daily driving I will empty it with every oil change, I will get about a 1/4 inch of light oil mixed with some water. In the winter it will be more milky with what I assume is more water mixed in. I will get the same amount out each track day that I get after 3000 regular driving miles, but it is more like regular oil with no water mixed in. I personally would not pour that back into the engine and I like that I can monitor how much oil is being caught as a way to potentially catch a problem early. The downside is that it is a pain to empty, and that if something catastrophic happened, it will probably fill quick, but I would imagine that if that scenario happened, full catch cans would be the least of my worries. I can also attest that my inter cooler is free of any oil residue.
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Old 11-14-14, 08:23 AM   #9
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Default Re: aos systems - to splooge or not to splooge

Quote:
Originally Posted by user1029 View Post
I ran the Peterson catch can for 5 years (which I assume is what Element Tuning rebranded) and I have had no regrets switching to the IAG AOS when they released it.

1. The IAG AOS had 3 ports so it relieves crankcase pressure a lot more efficiently.

2. The turbid, milky stuff I empited from the Peterson catch can was predominantly during winter time whereas in the summer it was more clear oil consistency which can be attributed to the climate change. Keep in mind that the catch can is not heated so that is why it is milky in the winter. The IAG AOS is heated with coolant so it will retain the clear oil consistency year round and that is the stuff that goes back into the crankcase. The heated coolant perfusion design of the IAG AOS is the most uniform throughout the can and superior to Crawford and Perrin.

3. Furthermore, since the IAG AOS actively empties, the oil will not sit around in the can itself to even have a chance to condense into that frothy substance.

4. The Peterson catch can had a chance to fill up with oil on hard cornering G's on the track and this sequestered the oil into the catch can and deprives your motor of oil. The IAG AOS will return that oil quickly back into the crankcase.

5. The Peterson catch can left oily residues in the adjacent structures which initally escaped from the breather filter. Not only was it an eye sore but could potentially pose a fire hazard.
it is not the same can as the peterson you had, user. peterson manufactures it to phil's specs. this from the horses mouth:

"It is not a Peterson Breather Can. We have changed the design 3 times over the years but our can is 3.5" in diameter for maximum capacity, has -12 and -10 breather ports. Everything about our can is custom manufactured for Element Tuning and we are even the only company that makes the 3.5" band clamp as that didn't even exist. Because the spun tops and custom clamps are not mass produced for any other applications, it drives the cost to where it is currently. "

...which is about twice the cost of a peterson breather can. you get what you pay for in this case.
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Last edited by Neanderthal Racing; 11-14-14 at 08:48 AM.
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Old 11-14-14, 08:39 AM   #10
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Default Re: aos systems - to splooge or not to splooge

KillerB, I'm curious as to which AOS are you using and why?
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