Air Oil Separator VS Catch Can Explained. Is One Better?
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- Опубликовано: 30 сен 2024
- This is a very frequent question that I see asked a lot. "Should I get an AOS or will catch cans work okay?" So in this video we are breaking it down and taking a look at both an IAG AOS and a set of Radium Engineering Duel catch cans.
First off both of these systems are very beneficial to have especially for any High compression engine or turbo charged application. And you can only imagine the benefits that these systems will have when you have a turbo high compression car.
For me i have no preference for which system is better than the other however there will be clear indicators of which system you should used based off of your application, but you'll just have to watch the video to find out.
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installed a catch can to my 2019 v6 challenger. kept reading, "oh you really don't need it for the v6's". Well, after 6k miles I poured out 3oz of oil
All engines will have blow by, turbo, supercharged and high compression will have it worse but any engine will benefit from a catch can 🔥
Is Challenger made by Dodge ?
@@lowlifeangler yes
Catching .0005 ounces of oil per mile.
Speak of the devil 👹 I was just explaining this to my son yesterday. This will be a great visual for him.
Another one🔥
Eyyyyyy! Perfect timing 😁
A few points to add.
1) not your fault, but I think there is a lot of misuse around catch can and AOS terms. The way I see it, a catch can is a type of Air Oil Separator. It's function is to...wait for it...to seperate the oily residue from the returned air.
You can classify these generic Air Oil Separators into various types:
a) a very simple non baffled non-returning unit. Still attempts to seperate air and oil but probably doesn't do a great job without baffling. (E.g. el-cheapo eBay units)
b) a baffled non-returning type (like the radium units in your video)
c) a baffled returning type (like the IAG/Cobb unit)
2. It really should be noted that blowby is not just air+oil. It also carries a filthy mixture of burnt and unburnt fuel. So, whilst the IAG AOS may do a good job of keeping water condensation out of the caught blowby fluid, the IAG unit is still dumping this polluted content back into your sump. This is more severe on E85 applications. Recommended to decrease oil change frequencies if they are not already frequent. This is the main reason why I have a bit of a preference towards non-draining air oil separators (aka catch cans).
3. the amount of blowby that you get (or that is caught in a catch can) is not only due to the condition of your engine. It's also influenced by how you drive the vehicle. Case in point, the catch can I run on my STi runs bone dry 99% of the time. However, out on track where oil temps can breach 120degC, this can thin the oil (I use 5w40) out to such a degree that you now see alot of blowby. I caught approx 300mL from 30min (2 sessions) of circuit driving in 30degC ambient temps. That triggered me to install an external oil cooler - now the catch can runs dry again even at track duty.
Aos also is a bit harder to install which will cost more. I don’t like the idea of dirty nasty watery oil going back into the engine so I prefer catch cans but my tuner was adamant that I switch to an aos with the high boost I’m running. I declined as I honestly love changing my catch can frequently so I can easily look at what’s going through my engine.
Catch cans work great, just need to remember to drain them and they're solid 🔥😁
How often do you empty it with the turbo?
@@TheWestysworld every month or so I’ll pour out about half an inch of oil out of the can
Don't put fuel diluted oil blowby back into your sump. A catch can is better IMO. AOS is for people too lazy to drain a catch can. Place it in a hot area of your engine bay to ensure water and fuel are driven off and all you drain is oil. This is basic physics. Having a catch can or AOS is even more important if your engine is direct injected.
I kinda like the idea of catch cans since from what ive seen from other research on catch cans they catch water and other junk that isnt oil and make sure its not going back in the oil, which in turn might help keep oil cleaner? Idk about that maybe not noticeable but in theory it should. Idk thats just my thoughts
Your spot on, I just put a set of catch cans into my BRZ today
Living in a cold climate and not wanting the hassle of having to keep catch can empty and hope for not freezing I went with aos. Was planning catch cans for a long time but ultimately was convinced to go with IAG and glad I did
As a new Subaru owner, dude your channel is like the best thing ever. I had so many questions and you’ve answered like all of them in your vids already🤣appreciate it man, you a real one
Eyyyy, glad the videos have helped!
Crazy I've been looking at a catch can and here you come out with a video on it. Awesome content for any wrx sti owners out there looking to mod their cars. Keep up the great work man
Thanks my man🙏🔥😁
I was just about to say you've got 2 catch cans and one of them will be empty and the other one will have oil in it. The reason for some reason someone told you to put one on the clean side or bank one of your engine when in actuality, you only need one on the dirty side, which is bank two of your engine, because Bank one is only getting clean, filtered air through it. That's remember PCV positive crank case ventilation, so there is only one direction of flow. Your PCV valve has a check ball or check valve within it in order to eliminate any gases from going back into the engine. The other thing is never ever re-introduce any oil from a catch can or AOS. Doing so would be re-introducing small particles of fuel droplets back into your engine oil thus creating oil delusion and don't want that! Anything you catch you dump into another container to be recycled when you take your engine oil back to the auto parts store for recycling. Yeah, I think somebody just took advantage of your set up and said you would need to catch can on both sides of the engine in order to increase sales. I've never seen somebody have oil in both of their cans.. it's also a good idea to put stainless steel wool inside the catch can in order to increase the filter, media and the opportunity for the oil papers to condensate as well cool off the air, a bit more before re-entering the intake manifold. Cheers, mate.
IAG AOS is one of my favorite things I've installed on my car. Highly recommend their AOS, great product.
They make a killer AOS 🔥🙏
Agreed .... the IAG is highly functional and a reasonably easy install. If I would have only removed (deleted) the sound generator tube beforehand, things would have been so much easier. Cheers.
@@Smeedia what about cobb
Cobb is good. Just a re-branded IAG with diffrent baffling
bad things happen when you pee in your oil... got it 👌🤣
The reason why the "oil" in the catch can seems thinner is because it's not just oil, being separated. It's mixed with other vapors, including water and fuel. I would go with the Dual Catch Can system because I wouldn't want to pump anything but 100% oil back into my engine. This would prompt you to perform oil changes more frequently.
But doesnt the aos seperate water oil and air
Yes and since catch cans are not being recirculated with filtered oil you really have to keep an eye out on the oil level in your engine. Depending on your motor’s health or piston to wall clearance if it was done to tight tolerances or loose tolerances will dictate how much blowby you have. I noticed the oil level can drop quickly where if you weren’t checking your oil level you may find your oil level on the dip stick isn’t even meeting the minimum level required. Running e85 definitely thins the oil in your engine. On oil changes you can see how watery the oil your draining is and can smell fuel mixing in your oil which lowers the viscosity of your oil.
Yup, on my GDI, I get this black, runny, foul smelling, fluid in my can. I surely wouldn't want this to recirculate onto the backs of my valves. 💀
@@HandMadeWrathNope, I honestly don't understand the point of the AOS in this configuration over a catch can. As the only tangible difference is the AOS dumps its contents back into the oil system. Adding in the complication of running coolant lines to heat up the AOS system. The coolant will be whatever your thermostat opens up the system at or generally around 180f which isn't hot enough to vaporize oil or water but will for fuel but only if given time. Being it's immediately dumped back into the oil system and you see how little actual fluid these collect (tablespoons in thousands of miles) it makes no tangible benefit to the additional plumbing and risk of extra oil and coolant lines to possibly reuse a few tablespoons of not great oil anyway.
@@Vermonstered my view on this is that both catch-cans (or non-return-to-saump air-oil separators) and what are marketed as "AOS" (or return to sump air-oil separators) both have their use cases.
For street/light-track applications for lazy owners - return-to-sump AOS.
street/light-track applications for fastidious owners - catch can
For heavy track applications with lots of blowby or if you are in a setting where you do many continuous hot laps (endurance racing etc.) - AOS. Polluting your oil mix in your sump is a lesser evil compared to running low on oil.
The main thing is the pvc system has to be a closed system with no air filter and the valve cover system has to be vented to allow air to escape when you have high pressure like rpms.
The IAG aos is great. I used to smell oil after a hard pull, but now nothing. Love the no maintenance. Wish I could see how much blowby is collected
Can always swap it out for a can set up if you wanted to see how much you were getting 😁
I just installed a oil catch can on my 2019 wrx and the turbo is noticeably way quieter, it also makes me feel like my car isn't getting the power it was before. I'm not sure if i did anything wrong or if all this is normal with a catch can. Any insight would be very appreciated! Thanks! Great content as always man keep up the good work
The idea of having an additional coolant/oil return line to rout, on top of having potential contaminated oil feed back into my oil pan is why i wont do an air/oil separator. Catch can it is. Great video.
Loved the catch cans on this car, kept a lot of the nasty out of the motor 🔥
Nice!!! Perfect before buying!! Just My brother and I we're talking about this last week. He got the twin turbo Stinger Kia, and me My subie. AOS is the perfect fit for me 😝
Thanks for the info 👍🏽
Definitely will help keep things healthy! Glaf the video helped 😁😁😁
OK so which one is the best the IAG competition or the Crawford V3 aos because im getting ready to buy one of them lol crawford is 100 less ijs!!!
IAG has my vote, Crawford is a great AOS but practically all High HP EJs/FAe run IAG. They work great, have multiple mounting positions
What would you recommend for a 2018 FXT that’s my daily in Colorado. Cold winters and warm summers.
If Temps go below 0 get catch cans if they don't tend to go below 0 an AOS should be alright
I just want to say thank you for the education! I appreciate your videos my dude 🙏
Anytime!!!
I have a 2021 zl1 camaro. Thinking using a catch can. What's your opinion?
Great option to consider, even N/A cars will still get blow by. Not sure on the C/R on the LS but higher compression will still be a victim of oil blow by.
The coolant connection COOLS the vapor so it will condense out the water and volatile organics, leaving cleaner, drier air to go the to the manifold.. The gases coming out of the crank case are much hotter than the coolants system. You either want the catch can or OAS out in front of the radiator for cool airflow, or cooled by the cold output of the radiator.
Had a Cusco on my sti and got mostly vapor, difference was running Motul 5W-40 Xcess which also helps with less blowby instead of regular 5W-30
Interesting to know, but makes sense a higher viscosity could reduce the amount of blow by
Motul also make STI performance oil - 5W-40 - recommended for the S207, S208 models
The heated AOS is good at evaporating some moisture but I suspect the return oil still brings blow by fuel & water vapor back into your oil pan. 3k oil changes are crucial
Your coolant is only 180f, the vapor entering the can will likely be in the same range of temperature so not much benefit. The purpose of heating the AOS is to allow the water and fuel vapor to pass through because the temps are closer to their vaporization temp while oil will hopefully condense. You want the small amounts of excess water and fuel to pass back into the combustion cycle and exit the system. But for any daily driven not heavily modified car, I question why anyone would want to add an additional oil line, tap to the pan, t off a coolant line all because they're too lazy to check a catch every time they do an oil change. Or in this case it looks like he could get away with 3+ oil changes and still have few problems.
Question buddy
Had a 2014 F-150 JLT oil separator had to empty it every other fill up with gas it definitely worked very well
Just traded for 2018 F-150 purchased a brand new JLT 3.0 oil separator 3000 mi not one drop of oil so far concerned something isn't right can you tell me is this normal?
Normal, some engines are better with engine consumption than others. So if your not seeing a ton your rings are probably seated very well
@@Smeedia awesome thank you so much for the info if that is the case would you recommend leaving it on I have lost maybe 2 mi per gallon on my economy thank you so much
can you have........ . .. . . . . .. . . .. . .. . . . . . . ............ .. . both ??
..... yes 🔥😅
Great vid and post as usual. Just had the install of the IAG AOS done, so nice, looks fabulous in the car and functions so well. However, I did consider the catch can approach but ultimately went the "set it and forget it" route it with the AOS. Cheers.
Great video as always! What was your reasoning for going AOS on the blubaru and dual catch cans on the BRZ and not both AOS or both catch cans? Wanted to try each out?
Wanted to be able to compare the two as both cars are driven. Personally I have no prefrence on either option. Theyrr both good to have but catch cans will typically always be cheaper
Here is another benefit to running a Catch can vs an AOS: being able to monitor/measure/validate that the system is working properly. With an AOS it's fire and forget, which provides no means to monitor/measure/validate how much the system is filtering out. Being a "touchy-feely" guy, I want to know exactly what is being pulled out of the PCV system. I personally don't want to dump any of that crap back into the oil system (cause it ain't just oil!!!). Being able to monitor/record collections allows me to see changes over time, where the AOS doesn't. So I'll take the CC over the AOS and feel confident in my findings, versus only assuming. And the first 3 letters of assuming is _ _ _. 'Nuff said.
I've been advised by a very reputable local tuner/builder to not run catch cans or AOSs because with our cold weather, the tubing tends to plug up and freeze causing the crankcase to pressurize and cause other issues. What are your thoughts?
In very cold climates it can cause any moisture in the trunk line to freeze and plug the return hole. But it needs to be very cold continuously for that
This was the 1st vid I watched to learn about this and feel like I know a heck of a lot more now, thank you for being detailed! At the end of the day, I think I'll save up and go the AOS route
Glad to hear the videos helped and an AOS is well worth it 🥳
now i know all car engineers like all of them all stooped like MB, PORSCHE,AUDI,CRYSLER EVEN ROLLS ROYS NO ONE FIGURE THAT THEY NEED INSTALL SIMPLE OIL CATCH CANS LOL OMG!!!
Also, I throw a stainless steel scrub brush you use for doing dishes, into the catch can. It provides a lot of extra surface area for oil vapors to come in contact with, stick to and condensate on to drip down to the bottom of the can rather than making their way through the air stream up the exit tube to the air intake.
Could you use not very densely packed steel wool like a giant crack pipe for your engine
@@psions555Before track days I add the steel wool and roughly an 8 ball of crack to my catch can. YMMV.
@@BurmaJ Try heroin instead. It will make the motor run so we'll. Be sure to add it frequently and not let it run out or the motor will run rough
A single catch can is all you need. AOS is usually needed for 1. class racing, or 2. super lazy soy owners that don't know how to check their oil. If you have a properly functioning engine, you don't have much blow-by anyway, and any that you do get (if you're big horsepower), then catch it and bin it -- check oil often. Simple.
I have an N/A EJ25D and I've been looking into adding a catch can but until I looked them up I didn't know there were Air Oil Separators AND Catch Cans. Now I don't know what to get lolol. Anyone recommend one over the other? I don't have any power mods on my engine, just want it to function at its best and live a long healthy life!
For the 25D a catch can would be sufficient 🔥 saves you a little bit of cash and will still provide good engine health 😁
@@Smeedia Thank you sir, will definitely shop around for one!
I am installing a dual catch can in my turbo direct injected Alfa 4C.
I had Mazdaspeed 3, oil catch cans were really useful that engine blew a lot of through. Like an old Porsche turbo, it you accelerated hard and closed the throttle, then nailed the throttle it was like a smoke generator. Totally normal on MS3. So was carbon build up.
Some engines are prone than others. The Alfa 2.0 in the guilia has very little blow by. The 2.9 now has port and direct injection, like Fords and many new engines. Helps not only with managing combustion but also keeping valves clean.
Duel injection is 🔥 the FRS/BRZ platforms use Toyota D4S system to prevent carbon on the valves as well 🔥
Hey man I have a 20FA-20 lol it’s my first subie she’s all stock haven’t done nothing at all but seeing your video has me thinking the obvious better choice would be an (AOS) but seeing your set up on your BRZ running dual catch cans seems like that kind of set up is more than enough to keep the engine healthy and happy as long as it’s not being pushed too far beyond reasonable HP it’s tuned to handle and what’s the price difference between the two setups you showed on this episode ? Huge fan of the channel too man very well organized material and subie 😎🤟🏽
Eyyyy honestly a single catch can would be more than sufficient. Radium makes some pretty affordable options. I know Crawford was working on an AOS for that engine but nkt sure in price point of it yet 🙏
Great video.
For me If it’s something like a daily a catch can is more than sufficient and actually to me better than a “AOS” because not only does a catch can not only desperate air and oils. It completely traps it in the can. That’s good because oil can potentially be contaminated by fuel and other stuff which isn’t beneficial to longevity. So yes a catch can actually is a “AOS” but it keeps that oil. On the down side you will lose oil but it’s marginal and not a concern.
However if you have a catch can on a race car then that’s a different story. A race car gets wayyy more blow bye. And during a track session the last thing you need is to trap the oil in the catch can because then you’ll get oil starvation and that’s the last thing you need. So what an AOS does compared to a catch can is drain that oil back into the oil pan. Now the oil could be potentially contaminated but that’s a zero concern in a race car because the oil would be changed frequently anyways.
So why not slap a AOS on a daily? Well longevity. A daily isn’t getting as much blow by as a track car and really doesn’t need to send the potentially contaminated oil back into the car.
Most of the time people get an AOS because of the “set it and forget it” feature. And avoid the catch cans because they fear having to do more work to drain the cans. But you can find catch cans with drains ports that you can run under the car. That will allow you to drain the oil while you charge your oil if you will.
Why not slap a catch can on a race car? Well you can but then it wouldn’t be a “catch can” it would instead be a breather tank. It’s like a catch can but with a much bigger body to hold more oil and vents the air atmosphere. So all that crap is never returning to the engine. But what about oil starvation. Well that’s where larger and baffled oil pans come into play. But that’s another story.
In the end
To me: catch’s cans for daily’s or even street cars (low end near stock power levels)
AOS for track car/race car (high end power levels)
I think it comes down to how you drive the car, some people drive their daily pretty aggresivly. I know toh my STI getting kn the freeway and backroads i dig into the car. Both systems function very well. And either one is better than nothing
Smeedia your right. Driving habits are also a thing to consider as well. I always forget that because I kind of baby my sti lol and yea both are better than nothing. To be honest I got dual catch cans because it’s cheaper and it’s better than nothing even for my stock sti lol I figured out the rest after doing research AFTER installation lol
Sum Guy have you noticed any oil in your catch cans given that your stock?
Alex Peguero absolutely. There was a decent little puddle sitting in the manifold when I had the throttle body off well. There was also oil in the intercooler. I flushed it with acetone and when I drained it out the acetone was a gold color almost like brake fluid
Sum Guy wow
old video so late comment but I would have taken the can from the driver's side and attached it to the passenger side downstream of the can that is catching oil, just as a test to see how much the second can would catch in comparison, to get an idea how much oil vapor makes it past the first catch can. I am curious just how much oil the can is actually catching? 80%, 10% or less? how would you even know unless you are some how able to catch 100% of the vapor before the intake then do the math on what a single catch can gets.
I was literally thinking about this last night since your catch can post on instagram lol
Had to get some interest in it before posting 😉 lol
Nice. I like how the oil is put back into the system with the AOS. Convenient. Never knew the difference and now I do! Thx bro 😎
Anytime 🔥
What if it is not turbo can you still run still run two catch cans. My car is a Hyundai.
You can but it's over kill, 🙏
Idk about “exploding the engine” it’s not a completely pressurized system just ambient I thought. Definitely would blow seals tho
w8, N AOS ideally separates stuff & sends only oil back out?- but the catch can separates stuff & sends only air back out?- so I’m guessCng, ideally, a catch can for the clear oxygen port(s?) back to throttle body, but N AOS for pcv port back to manifold? is that right?🤔 - & btw wat do each of these do with water/moisture?😐..
I’ve been looking for a catch can for my VW 2.0 TSI engine (factory spec) and my biggest concern is freezing oil lines in winter, what should I consider to avoid that?
For a catch can you don't need to worry about it because it will not be returning the oil. But in super cold areas an AOS can have the return line freeze if they're not using coolant to hear the AOS
The catch can on the passenger side seem to be the one needed. I just installed this one. But beware, check the hose that it comes with. Mine was a piece of junk and actually busted, causing an engine light code, due to pressure imbalance. Get a good quality, non-collapsible hose.
A couple of tea spoons is not bad... better then a couple of quarts! ( My Chevy due to bad timing chain cover gaskets, resulting in a new cheap timing chain from AutoZone which resulted in a newer engine)
Did anyone try installing a catch can on the 2005-2010 Honda Odyssey? Mine has an unusual PCV shape. Please let me know if installing the catch can on the 2010 Odyssey is possible. Thank you
You finally sold me on the catch can here, seeing that emptying it at oil change intervals would be fine.
But hey, imagine that, 4000 miles without checking a catch can on a Subaru engine and it didn't completely overflow! Must be some pretty good engines after all! 😉
The catch cans will definitely help 🔥🙏 and oh yes 😁
4000mi, and they barely had any in it? Must be nice. I put one on my 2.0T VW, and it fills up 300ml catch can in about 70 miles.. Yet compression and leak-down tests are in spec.. WTAF lol
@@geriatricginger probably just means his can isn't catching as much lol
i install a AOS on my WRX and used clear silicone hoses to see the magic and damn there is a lot of confederation. everything throw black rubber horse and assume all is fine.
I think I'll just run a catch catch and drain it. the coolant hoses arent heating the hose off the block to the AOS where the condensation really happens
I've had a catch can on my turbo Veloster for probably 4 years now and I've only had to empty it once. It's not a frequent thing at all for me.
Thank you for explaining good video
Anytime 🥳
Why do we know what happens when you pee in your oil?! :D
😅😅😅
Tengo 3 preguntas. un oil catch can puede generar mas presion dentro del motor ?? importa el tamaño del occ con un motor L4, v6, v8 ?? y por ultimo es mejor 1 o 2 occ en un motor v6 ya que esos motores tiene 2 salidas de pcv una por el banco 1 y la otra en el banco 2 ??. Tengo un impala 2019 V6 motor es LFX y cuando le instale el occ me empezo a silbar y cuando le quitaba la varilla de aceite se le quitaba el sonido al final se lo quite todo por miedo que se me rompa el motor
Just finished installing an AOS on a 2016 WRX (Crawford. I’m sorry, but I should’ve done more research).
Anyways, the car won’t start. AP gives P0606 which is an ECU fault. Could it be the battery? A pinched wire? I’m kind of panicking here. Any advice is appreciated. Thanks.
Double check all wires are plugged back into the ECU had that happen once and the ground strap was off
Some people say that oil catch cans or air oil separators can actually damage your engine because they restrict the exiting airflow thus building up pressure in the crankcase. Any truth to this?
So, you recommend this for every WRX, but Subaru tells me installing one will void my warranty. I have a brand new 2020 WRX with only 4000 kms on it. Should I wait?
Unfortunately it will void it, but it is something I suggest doing qhen your outside of warranty
I see aftermarket AOS in Lexus GSF the V8 not the F Sport why is that? You can put AOS on naturally aspirated V8?
Great information. But what about diesel engines. I have not heard of catch cans with diesels. They have much higher compression than gasoline engines. Thanks.
Hello Sir! I know you said both Oil Catch can & Air oil separator works similar!
What you suggest to work better for 2013 BMW 535i GT Twin Turbo Charge?
Thanks in advance
by the way I don’t care about the price at all
I just want the best for the engine.
Catch cans, will help keep some of the moisture of the oil system 🙏
I live in -30 Degrees celsius winters in Alberta and was told AOS can freeze the lines and potentially blow up. ANy suggestions for catch cans?
Radoum catch cans would be my suggestion 🙏
My vehicle engine has a built in oil separator. I added a catch can. I don't find much oil in the can, but I do get water condensation.
The reason why it was so liquidy as you referred to the engine oil in the catch is not due to water because it would be milky like Yellowish lol it's simply due to the fuel vapours from the combustion process. That's why the oil looks thinner is because it's been diluted with gasoline after the vapours condensed within the catch can. I'm gonna have to do my own video. I see so much misinformation out there with improper set ups due to misunderstandings on how the engine operates with a clean side and a dirty side.
Interesting video and well done. Not sure I 100% agree with all of your statements/philosophy but the video is well done and I appreciated the intro to some new brands.
Idk about your terminology but this is wrong. Oil catch can and oil and air separator is the same breather system is different where it vents to the atmosphere and not circulate to the intake.
What is the logic to building a $ 50,000 truck and having to worry about sludge in the intake-system ?
What if you have natural aspirated v8 do you need oil catch can or air oil separator?
Catch cans would be more than sufficient 🙏
@@Smeedia thank you very much. Great video
Same description as motoIQ video explaining this product (air oil separator) almost verbatim to mike. You must have watched his video then decided to make one lmao!
I get no oil accumulating in my oil catch can...is that bad or good...2009 bmw twin turbo e89 n54
I just empty out my catch can every time I change the oil. No big deal I see it as part of the oil change. I have the JLT Performance and it stays mounted all I do is screw off the bottom bowl and empty it out.
you wouldn't want to use a separator and recycle the oil back if you use a direct injection....
What do you think of the aos that is on top of the oil fill port? It's where you refill the oil after a oil change I have a Grimm speed
10/10 do not recommend. Live grimmspeed but that "AOS" does more harm that good. Your better off not using on than it
Just a question I ordered something off your site , and it said to be shipped out on the 21st , but I check usps and it says still waiting for items.jw.
Whats the order #? I'll take a peek tonight, usps been super slow the past few days 😤
Just picked up my 21’ sti and your videos are godsend. Love the work, keep it up ! ✌️
Eyyyyy congrats on the car 🔥😁
I'm putting dual cath can on the 22 wrx would it be fine if I put em on or would there be problems I've seen someone say that the catch cans cause the blowoff valve not to work correctly
AOS is better for lower hp motors like under 500whp. Catch can is better for higher compression V8’s making big power because they create so much more crankcase pressure so something like a IAG AOS wouldn’t be able to handle all of that. That’s why you won’t see a AOS on a any LSX motors, 5.0 coyote’s, hemi’s, etc. People with motors like those also would prefer catch cans since when you empty them you can see how the motor is acting, how the oil looks, any metal shavings and so forth
🙏 good to know 🙏
So the 4-6k mile check of the catch cans is exactly why I went single can on my WRX and did passenger side only. Saved money since the driver side can seems useless from multiple videos. Do you think I made the wrong decision?
Not at all, as long as your remembering to empty it, you make a solid choice 🔥
Unless you have a GDI engine you really don’t need these things.
if you get a catch can rather than the aos, you can monitor the health of your engine. increased oil in your catch can may be a sign of piston ring wear
On a ej205 Will you get more oil from crank/pcv or from the heads?
doesn't the pvc system work on a vacuum? how can you build your own system when something diy wont be sealed properly o.o
I recall reading somewhere that AOSs have issues in cold weather, i assume due to condensation. Did i misunderstand what i read, or would catch-cans be a better option up north?
100% spot on, in sub freezing Temps catch cans are recommended 🙏
What I don't understand is why a AOS isn't standard from Subaru.
I think Catch CAN is better than the oil separator. If the oil has been contaminated with water then that oil isn't good for the system.
The liquidy state of the oil is probably due to oil mixed with unburnt gas
I opted to go with the ADD W1 catch can and only installed the CCV side (passenger side) as I've seen so many videos regarding duel cans that have the same results, dry PCV (driver side) can. The product is comparable to many others but at a lower cost, $170. Haven't seen too many WRX/STI's with this brand, have you heard anything about them?
Can't say I have, but I do agree a single catch can is really all that is needed
Can this be put on the Lexus IS 250? It is known to have carbon build up.
wym i always use a 1:3 ratio of oil to pee
That is a pretty good ratio to be using 😅
I just want to know if the air oil separator 100% takes the oil out of anything going to the intake. If not so i can just keep venting to atmosphere and forget about it
Though I own Mazdas, I find joy watching all of your videos!
Ryyy appreciate the support my friend 😁🔥
@@Smeedia Yessir!
Great video! Any recommendations for local Seattle area shops to install the iag AOS?
The mod garage is a popular one people go to as well as drive auto sports 🙏
Shoot my catch can on a 6.6 gmc catches 3 oz every 4 thousand miles very nasty stuff.
0.75 for normal talking speed
Looking into catch cat vs aos for my 2020wrx. My friend said everything is garbage compared to iag v3 street series but really don't wann spend 439$ for an aos. Would like to just go with catch can as long as it grabs the residual oil. I don't mind servicing. And then should I be going with single or dual? Thoughts?
I'd suggest the Radium duel can set up, works very well/looks good and easy to service 🙏
+1 for radium dual catch cans. They’re pricey but are great. The iag aos is probably the best aos on the market. I have an iag aos v3 on my 2018 wrx rn and I’m thinking of switching to the radium dual setup since they are better than an iag aos for keeping contaminants out of the engine. On phatbotti’s website he ranks the efficiency of each and he said from best to worst at keeping contaminants out of the engine is radium catch cans, iag comp aos, then iag street aos. Only benefit to having an aos over catch cans is that they’re maintenance free. Also if you live in a cold climate, definitely get the catch cans because all aos’s suffer from sludge buildup.
Good expansion, but street series AOS = RIP.
It’s literally doing exactly what you say you don’t want and putting oil vapor back in to intake.
True, the AOS helps to an extent. Ove seen a few people run catch cans inline with their AOS to try and mitigate as much as they can. But also explains why big power cars VTA with thr PCV system. How's yours set up on the 1100WHP car if you don't mind me asking? 🙏
You forgot to mention the Radium Catch cans don't vent into the atmosphere so it legal in places like California.
Very good point to add 🔥
The one on the drivers side is completely useless. Obviously this guy needs more education.
Appreciate the video. Just saw it, sold on both setups for reliability. So is an air oil separator, worthless without the coolant connections?
Not worthless but thr coolant connections help to keep moisture from building up by keeping the AOS the same temp as the engine
It's also to keep your throttle and intake clean
I have been struggling more then I’d to admit in making this decision