Who makes a good AOS for our cars? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

D K · 05-26-2014, 01:02 PM

Trying to decide between catch cans or AOS.

Who makes a good one?

D

AdrianG · 05-26-2014, 01:08 PM

Radium.

- AdrianG

Reaper · 05-26-2014, 01:11 PM

crawford if you want an actual AOS and to dump it back into your block. I personally like VTA which you cant really screw up. I use FullBlown's but they are all pretty much a can and some hoses.

speargunsandracecars · 05-26-2014, 01:16 PM

Crawford is the only company that makes an AOS closed loop system as far as I know.

I have a Radium Engineering dual catch can system. One can for PCV and one for crankcase ventilation. It works great.

I'm not a fan of the AOS. The stuff coming from the PCV isn't too bad. But the blow-by gasses coming from the crankcase ventilation are essentially unburnt fuel and exhaust gunk that goes back in to the crankcase. Pair that with condensation when the car is sitting, and you'll have some water droplets going in the crankcase too. The AOS 'cleans' the air coming in to the intake system but it still pushes whatever's been removed from the air back in to the crankcase. Not only that, having a catch can could predict issues with the engine, I.E. you're having a ridiculous amount of blow-by gas residue in your can or something.

If you don't like draining the oil, go for the AOS. If you don't mind, go catch cans.

D K · 05-26-2014, 07:05 PM

I was checking out the radium as well...

How quickly will the cans fill up?

Will it last a 20 min race?

AdrianG · 05-26-2014, 07:27 PM

Quote:

Originally Posted by D K

Will it last a 20 min race?

If it doesn't you have bigger problems. Mine usually gets emptied every 3000km but it's always less than a 1/4 full.

- AdrianG

JDKane527 · 05-26-2014, 11:26 PM

Quote:

Originally Posted by D K

I was checking out the radium as well...

How quickly will the cans fill up?

Will it last a 20 min race?

I have a radium pcv can and emptied it after 4k miles, including a track day and it was about 1/3 full. Still had some room.

Sent from my SCH-I535 using Tapatalk

Decay107 · 05-26-2014, 11:44 PM

I have the Raduim, It's perfect.

chimmy · 05-26-2014, 11:57 PM

Grimmspeed makes one. Unsure if it would fit though. Replaces oil cap, but there's a bunch of stuff surrounding our oil cap in the engine bay. Worked great on my EG33 Impreza.

http://www.grimmspeed.com/air-oil-se...x-sti-lgt-fxt/

stockysnail · 05-27-2014, 01:42 AM

I have Radium dual cans as well. So far no oil detected after a few thousand miles with one autox day.

I can get one person a good deal on a new dual can kit at less than their site ($30 less) with free shipping to the US if a lucky person is interested.

Decay107 · 05-27-2014, 02:15 AM

Quote:

Originally Posted by stockysnail

I have Radium dual cans as well. So far no oil detected after a few thousand miles with one autox day.

I can get one person a good deal on a new dual can kit at less than their site ($30 less) with free shipping to the US if a lucky person is interested.

Really, you didn't have any after the autocross day? I had about 2 teaspoons of oil in my PCV catch can.

stockysnail · 05-27-2014, 02:20 AM

Quote:

Originally Posted by Decay107

Really, you didn't have any after the autocross day? I had about 2 teaspoons of oil in my PCV catch can.

I looked and I have nothing on my dip stick. As far as I know they are installed correctly but perhaps the hoses are on backwards as there weren't any install directions for the supercharger kit. All I had to go from was someone else's install they posted.

Craig · 05-27-2014, 01:12 PM

I use one of the Mishimoto cans, works perfectly for me - I'm actually going to clean it out to see how much oil is in the can, I'm thinking about a cup or so

DBW · 05-27-2014, 01:18 PM

I have used the Crawford AOS on every one of my subaru's since 2007 including my BRZ now. They have all performed flawlessly

05-26-2014, 01:02 PM	#1
D K Stig's dark passenger Join Date: Dec 2013 Drives: FR-S Location: I work abroad Posts: 724 Thanks: 60 Thanked 316 Times in 186 Posts Mentioned: 20 Post(s) Tagged: 1 Thread(s)	Who makes a good AOS for our cars? Trying to decide between catch cans or AOS. Who makes a good one? D

05-26-2014, 01:11 PM	#3
Reaper in orbe terrum non visi Join Date: Jan 2014 Drives: violent Location: Mountains Posts: 1,747 Thanks: 279 Thanked 762 Times in 446 Posts Mentioned: 62 Post(s) Tagged: 1 Thread(s)	crawford if you want an actual AOS and to dump it back into your block. I personally like VTA which you cant really screw up. I use FullBlown's but they are all pretty much a can and some hoses. __________________ I have E85 where there isn't E85, that's my secret. http://www.ft86club.com/forums/showt...t=reaper+build

05-26-2014, 01:16 PM	#4
speargunsandracecars Senior Member Join Date: Oct 2012 Drives: 2014 BRZ Location: Southern Pines/Triangle, NC Posts: 150 Thanks: 1 Thanked 92 Times in 42 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Crawford is the only company that makes an AOS closed loop system as far as I know. I have a Radium Engineering dual catch can system. One can for PCV and one for crankcase ventilation. It works great. I'm not a fan of the AOS. The stuff coming from the PCV isn't too bad. But the blow-by gasses coming from the crankcase ventilation are essentially unburnt fuel and exhaust gunk that goes back in to the crankcase. Pair that with condensation when the car is sitting, and you'll have some water droplets going in the crankcase too. The AOS 'cleans' the air coming in to the intake system but it still pushes whatever's been removed from the air back in to the crankcase. Not only that, having a catch can could predict issues with the engine, I.E. you're having a ridiculous amount of blow-by gas residue in your can or something. If you don't like draining the oil, go for the AOS. If you don't mind, go catch cans. __________________ 2014 SSM BRZ For interesting automotive articles, click here.

05-26-2014, 11:44 PM	#8
Decay107 Turning is for Nerds Join Date: Aug 2013 Drives: 35 characters is not enough Location: PDX Posts: 1,974 Thanks: 836 Thanked 1,259 Times in 717 Posts Mentioned: 186 Post(s) Tagged: 3 Thread(s)	I have the Raduim, It's perfect. __________________ My build thread / journal / evidence for warranty claim denial Motorcycle build thread

05-27-2014, 01:12 PM	#13
Craig Senior Member Join Date: Jul 2012 Drives: Asphalt FRS Location: Central New Jersey Posts: 338 Thanks: 242 Thanked 191 Times in 66 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	I use one of the Mishimoto cans, works perfectly for me - I'm actually going to clean it out to see how much oil is in the can, I'm thinking about a cup or so __________________ Current: Nameless Headerback- Crawford BPB - Zeta Intake Duct - Mishimoto Intake

05-26-2014, 01:08 PM	#2
AdrianG Generally Well Liked Join Date: Aug 2013 Drives: '08 STi Hatch, '11 Outback 3.6R Location: Ontario Posts: 419 Thanks: 43 Thanked 197 Times in 125 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Radium. - AdrianG

05-26-2014, 07:05 PM	#5
D K Stig's dark passenger Join Date: Dec 2013 Drives: FR-S Location: I work abroad Posts: 724 Thanks: 60 Thanked 316 Times in 186 Posts Mentioned: 20 Post(s) Tagged: 1 Thread(s)	I was checking out the radium as well... How quickly will the cans fill up? Will it last a 20 min race?

05-26-2014, 11:57 PM	#9
chimmy Because BOXER Join Date: Aug 2013 Drives: Asphalt FR-S Location: Pensacola, FL Posts: 119 Thanks: 29 Thanked 45 Times in 28 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Grimmspeed makes one. Unsure if it would fit though. Replaces oil cap, but there's a bunch of stuff surrounding our oil cap in the engine bay. Worked great on my EG33 Impreza. http://www.grimmspeed.com/air-oil-se...x-sti-lgt-fxt/

05-27-2014, 01:18 PM	#14
DBW Motorsports Join Date: Nov 2011 Drives: 19BRZ PP, 16 M4 Location: ATLANTA, GA Posts: 67 Thanks: 36 Thanked 62 Times in 27 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	I have used the Crawford AOS on every one of my subaru's since 2007 including my BRZ now. They have all performed flawlessly __________________ Douglas W.

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