The 3MI Air Oil Separator Drain Hose Explained
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- Опубліковано 29 чер 2024
- The 3MI Air Oil Separator for most Subaru AOS's came out a while back, and we have been recommending it to maximize the effectiveness of your AOS.
But how does it work?
And what do you need to know when you are installing it?
We put together this video going into detail about how this part installs, why it works, and why it will ensure that you are getting the most out of your Air Oil Separator.
This part is available at Flatirons Tuning Here:
www.flatironstuning.com/3mi-r...
Audio Note - The camera/mic was doing something odd at the start of each of these clips, so there is more static that usual in parts
Thanks for watching and Stay Tuned!
In this Episode:
0:00 Intro
1:12 The Problem with a Stock Aftermarket AOS
3:54 How the 3MI Drain Hose Improves AOS Function
5:07 Installation Notes
6:47 Let us know what questions you have!
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What’s crazy I thought abt this a few years back when figuring out my AOS drain in my NA/T. Didn’t even know this existed till this video 😮
Very cool! Thanks for watching and Stay Tuned!
Been having issues with the oem drain back. Perfect timing.
Excellent! Hope this helps!
Thanks for watching and Stay Tuned!
I just installed this and it's a nice piece.
Thank for for sharing this it helps with my oil drain back with my rotated turbo setup.
Thanks for watching and very glad that this helped!
Stay Tuned!
Yet another great video! Nice work!
Thanks very much DP! Appreciate it!
Thanks for the explanation
Absolutely! Hope that it helps.
Thanks for watching and Stay Tuned!
Wow, awesome product thank for the good explanation !!
Absolutely! Thanks for watching and Stay Tuned!
You should also make a video to discuss the extra 5/8 (16mm) breathers on the heads + block center. Those that did not exist on early EJ blocks and heads. Some people plug them, what is the truth about these, in a catch canned scenario. Plug them or keep them? No information on any Subaru forums, but many times I see them eliminated on tuned/race cars
Thanks for watching and thanks for your question. I actually made a video discussing this and the PCV system a few years ago. Here is the link to that:
ua-cam.com/video/mO9mxDUDUDc/v-deo.htmlsi=1wUsIrJJESWC6Sj1
If you have any specific questions after watching that, let me know and I can add it to the list.
Stay Tuned!
@@FlatironsTuning Yes, I have watched it many times before and that is a very-very good video in the subject and the best that it is not only a printed diagram you try to follow but is actually demonstrated on a pure stripped block. Fundamental for anyone would like to understand PCV. But for those breathers, it does not say anything about keeping them or plug them off, I would need a professional opinion on that matter. Would be interesting to discuss. I’d guess you prefer keeping them, but still there is a habit to plug them because that is believed is something new and/or unnecessary complicated/emissions stuff, etc.
@@NorbertWeisz Gotcha. The short answer I would give is that I think it is better to keep them. The reason is that there are some advantages of balancing the pressure between each head and the crankcase.
Beyond that, if you ran into a situation where oil did slosh up to the oil drain ports on the head and block an covered them off, and oil started to build in the head, the oil that was sitting in the head will drain better once the cornering load stops with those balance tubes in place. I suspect that is why Subaru started putting them on all of the STI's. It can have the chance of reducing issues from oil sloshing, etc.
Hope that helps, and I'll add it to my topics to cover.
Thanks!
@NorbertWeisz that port, on an OEM install, breathers through the "AOSs" built into the valvecovers, commonly referred to as "balance tubes". If coming straight off of that port, expect a LOT of oil with it. Those blocks still have their crankcase breather towards the rear, like old blocks, that flow through the "Indiana" (baffle) plate that lives in the bellhousing.
I know 3MI Racing has something coming for this too 😉
@Flatirons Tuning , i just emailed you guys about this exact hose asking for information prior to purchasing. really glad you guys are making informative videos and are so attentive to your customers . definitely will keep buying from you guys just for this reason.
Thanks very much! Glad that the video helped, and thanks for your business!
Stay Tuned!
@@FlatironsTuning will continue to do business with you guys as long as you keep up the great customer service and making subaru parts affordable . The best customer service by far compared to alot of others i will not name !
So great content guys. Thx
Absolutely! Thanks for watching and Stay Tuned!
Awesome vid
Thanks for watching. Stay Tuned!
I feel like my phone call helped make this video. 😂
Ha! It could have played a part. We have got a number of questions about this, and have been working on putting an explanation together.
Glad it helped!
Thanks for watching and Stay Tuned!
Great video. Never really liked how the drain was also a pressure outlet, seemed like crankcase pressure would push up the drain. I'll add this next time I have the motor out, tight in there with motor in the car.
Thanks for watching and thanks for the comment. It does make a good difference to be sure.
Stay Tuned!
Great video , I have been having issues with my blow by and I have the iag comp edition unit it’s been worse than my stock system was sadly. Hopefully this improves it cause right now it’s probably the worst $500 I have spent
Thanks for watching and definitely sorry to hear that you are having issues. If you are seeing signs that oil is coming out of your Comp AOS, definitely take a good look at your plumbing, and especially the drain. I hope that the 3MI hose might be a help to get things working properly again.
Best of luck and Stay Tuned!
Got this not too long ago….one thing i must say is that i think they made the turbo oil drain side way unnecessarily long…had to trim it like 4 times to get it just right.. other than that it works…or maybe it’s ship that way for rotated setups…🤷♂️
Thanks for watching. Yes, you are correct. The hose is made long so that it will work with both stock location and rotated setups.
Glad you got it to work!
Stay Tuned!
Well dang it Batman. I'll need to do this at some point. I was wondering why in the heck they ran the hose the way they did in the first place. This is way better.
Thanks for watching. Yes, this is definitely better.
Stay Tuned!
I ordered one of these a few months ago when you guys first mentioned it on your podcast ep about PCV. 2 weeks ago I just installed a rebuilt VF48, Grimspeed ceramic coated Uppipe, and this 3MI hose. I tripled up on heat shielding between the ceramic coating, the provided sleeve and also a DEI sleeve. I'm still pretty nervous about the heat it sees since it's so close to the up pipe (I routed on the trans side).
Thanks for watching and thanks for the comment.
It is worth keeping an eye on the heat shielding for the first few days driving to hopefully catch any signs of issues with heat before they cause a problem.
Stay Tuned!
Mine lasted around 2000 miles before it cooked from the radiant heat from my uppipe. The supplied reflective hose cover is lacking/ I used orange fire sleeve and still couldn't keep the hose far away enough from my P&L EWG uppipe. Perhaps if my uppipe was shielded or wrapped I might have better luck than raw stainless.
Thanks for the info! Great video
Anychance you can explain the function of the heads + block oil/crankcase balance line? Most people in Australia block it off
Thanks for watching and thanks for your question. I actually made a video discussing this and the PCV system a few years ago. Here is the link to that:
ua-cam.com/video/mO9mxDUDUDc/v-deo.htmlsi=1wUsIrJJESWC6Sj1
If you have any specific questions after watching that, let me know and I can add it to the list.
Stay Tuned!
Someone else asked that in these comments and I just replied there.
I plumbed my AOS drain into the bottom of my Killer B sump with a one way check valve just to not have it somehow suck oil up into the AOS. What's your thoughts?
Thanks for watching and thanks for the question. Yes, that should work very well actually.
Stay Tuned!
I wonder if the turbo drain helps drain the aos with constant oil flow. It has to and with a rotated turbo this is a no brainer.
Thanks for watching. It can certainly help.
Stay Tuned!
That's the whole purpose behind it.
So I got a question regarding using a AOS that doesnt have that two port fitting coming out of the block near the turbo . Im using a radium aos and the only points for hoses to connect is the two breather hose's and the one on the turbo inlet . Would i just cap off the the crank case port on the block ?
Thanks for your question. The short answer is that the Radium AOS is not compatible with the 3MI drain hose. Radium uses a 3/4" hose for the drain, with the idea that such a large hose can function both as a vent and drain at the same time.
I was running this and had some issues over time because that large hose ended up getting pinched under the intercooler hose and blocked off.
ua-cam.com/video/iJs1SSAOYiU/v-deo.htmlsi=HN-8lp9L2Csjw_SH
If you are having issues, I'd recommend switching to either a Killer-B AOS (if you are not moving much oil through the PCV) or the IAG AOS and using the 3MI drain hose, as that will be a better solution.
Of you could go to the Radium Dual Catch Cans as I did as another option.
Hope that helps and Stay Tuned!
Speak of the devil. Ordered one from you guys a few days ago.
Ha! Excellent! Thanks for the business, and hope the video helps.
Stay Tuned!
Curious whether you could also implement something like the RCM AoS which drains directly back to the oil pan/sump. Are there any advantages to this? Seems like a good use of the second port on the Killer B oil pan
it wouldnt drain in that second port on Killer B pan, you'd need a hole higher up on the pan
why wouldnt it drain? i was going to do exactly this with my car and if rcm do it with their kit i cant see this being a problem but im curious on your thoughts. my car is rhd and the aos will be mounted on the opposite side of the turbo.
@@kizzdizz6400 My car is RHD too. What I think will happen is that the drain will be feeding the oil from the AoS into the full part of the sump and and so the oil coming down the drain hose can't push against the oil already in the pan and will therefore accumulate in the drain hose and AoS.
But if the pickup is constantly circulating oil then I'm not sure why this would pose a problem? The RCM oil pan does have that drain fitting situated higher than the drain plug though?
Thanks for your question. There are definitely advantages of draining directly to the pan. The problem is finding a good way to get there and staying away from the exhaust, etc.
We looked at trying to make an RCM AOS work here on a Left-Hand drive car, and it would be pretty challenging because there isn't a good spot to mount it on the left side of the engine, which is pretty needed to get the drain to run properly to the pan.
The main advantage of the RCM design over most of the other options here is that if there is pressure in the crankcase, that pressure will actually help the RCM AOS to drain. With other options that drain to the top of the block (and even to the Turbo Oil Return hose to an extent) that pressure can prevent the AOS from draining until the pressure drops (which is usually when you close the throttle).
Hope that helps and thanks for watching.
Stay Tuned!
@@FlatironsTuning Thanks for the reply! So is draining to the pan only peculiar to the RCM AoS? Can the IAG one be adapted to do the same? I have a RHD subie, so routing it past the exhaust isnt too much of an issue.
sorry, this set up seem to be an oil fire just waiting to happen, get a dash 18 AN fitting welded to the back of the sump pan.
Does that 90 degree come with the kit
Thanks for your question. The 90 deg fitting is from RCM actually. Here is the link to it on our site:
www.flatironstuning.com/rcm2965
Thanks for watching and Stay Tuned!
AOS Oil Drain line is also breathing in some cases, especially during WOT. Once you lift off the throttle, vacuum in crankcase will suck all that oil out of the drain line.
And this is still draining to the crankcase, so sees the same pressure drop...but has better routing and drains to a lower point allowing the oil to get out of the can while the intake manifold is not in vacuum.
@@Micah_Makes I highly doubt that pressure is different across the crankcase. I think pressure is the same in all spots. Correct me if Im wrong with some data. And if pressure is same, meaning the turbo oil drain is also breathing during WOT. Look at old school Porsche’s with low mount turbo setups, many of them attach breather to the turbo sump exactly for that reason.
@@ArtemBuiltRacing did I say the pressure was different? I don't think I did.
@@Micah_Makes I totally understand what you're saying.
When you say it has a better route, well it is quite possible that it is. However that turbo oil drain line is going to breathe more by attaching the AOS drain line. Would it impact turbo oil drain during WOT conditions?
I bought one years ago. It's still in the bag because I never figured out how to use it.
I hope that this helps, and that you can now get it installed and working properly.
Glad that you found the video!
Thanks for watching and Stay Tuned!
From what I'm told, 3MI Racing is finally doing a proper install video to discuss various routing options and install tips.
@@Micah_Makes Looking forward to it!
Catch can better
Thanks for watching and Stay Tuned!
Why? AOS is what's recommended by every Subaru tuner I've come across. A catch can, can't send the oil back to the sump. It's known these engines vent a lot of oil, too much for a catch can on the track
@jaredbawden6707 so u want milk looking oil back in engine? AOS only for lazy people who don't want deal with it.. the way I look at it best run two oil catch can. Beside subaru know to consume oil over time. Hell mines well check your oil level and dump your catch can.. subaru need extra care. Boxer engine.. ringland failure and head gasket..
@tranwrx an AOS doesn't send "milk" back into the engine, unless it's some cheap setup (that I won't mention the name of here). It's called an Air Oil Separator for a reason. What you don't seem to realise is that what makes it milky is water content. A good AOS is heated, so any water vapour travels out through the intake as normal with any other gases while the now separated oil is able to drain back to the sump.
Also you can have as many catch tanks as you like, but expect a ceased engine at the end of a track run, due to an empty sump. I've seen this happen.
@jaredbawden6707 there are two versions Track & Street.. on AOS.. good away, blow your money. One run coolant. Beside catch can pick if your Main bearings aka glitter in oil. Best way know your health of yo engine 💯. So tell me how u gone find that in yo AOS? Most normal people don't run track.. its daily driver.. dont get me wrong AOS good for racing application.. . Catch Can good for daily.. them billion dollar company out get yo money.. they always find some last-minute BS to sell and overcharge you more than what it takes to make their product..