People are missing the big picture. The amount of oil in the catch can is almost irrelevant. The most important thing is that the amount of oil making it to the plenum is minimized. From your 1000 mile later follow up video, it appears that has been improved but not eliminated and with only 5-10 ml in the tank, that means the new AOS is doing the bulk of the work and doing it reasonably well. The tank is only doing a little bit. At least it's cheap, light, and easy, so can't really hurt. To effectively get vaporized oil to fall out of suspension (air), you need some combination, volume, time, low temperature, and places for the microdroplets to seed. This is where a large catch tank could benefit--not because you need to capture a large volume of oil, but because high velocity air in a small tube slows down when it enters a larger volume, like a river dropping it’s sediment at the ocean delta. High volume=low speed=more condensation. The air also has extra time to traverse a larger volume (especially with baffles, which also provide seeding opportunities) before being routed back to the intake. Longer time=more condensation. I don’t know the solubility curve of oil in air at various temperatures and pressures or if the difference between ambient vs engine bay temps would be significant enough to be worthwhile, but lower temperature=less solubility=more condensation. So an ideal solution would be an infinite volume with a heat exchanger and plenty of capture points, but that just isn't practical. Would an inline oil cooler mounted at the side vent, then routed to a larger tank make sense? Maybe. Would all this complexity and expense be better then walnut blasting your intakes every few years? I'm skeptical.
Hey thanks for comments, great points about the volume etc. and agree a bigger catch tank would be more beneficial. Something I’ve been considering but just haven’t got round to doing it.
@@GarageTechAutomotive If you were to be able to weld up an aluminum one that fit behind the side vent and had some cooling fins, perhaps it col help even more.
@@plus790 yeah a custom made one would be ideal, that’s one of the issues with the off the shelf versions is that space is limited in the engine bay, especially if you want somewhere where it’s easy to access.
I took out the brass filter inside as it causes quite a bit of pressure /resistance. I reckon the round baffle plate inside would suffice. mine is not direct injection so shouldbe ok I guess.
The tube/pipe reducers,/adaptors, are they automotive parts or general hardware items, could you show a link, I'm having difficulties locating some in Australia thanks
Hi Nigel, I got the reducers from eBay link below. www.ebay.co.uk/itm/281671172701?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=SyBYxUWaS32&sssrc=2349624&ssuid=ysnWy0-bT4m&var=&widget_ver=artemis&media=COPY
Did my air oil separator last year , this is a interesting upgrade , are you running the standard 74mm throttle or 82mm on your ipd plenum? Very interesting videos you know your stuff ..
Hey, I normally check it every few months, depending on the mileage, I’d recommend every 1000miles until you get some idea of how much is collected in that period. I’d also check it after a track day etc. ideally I would have placed it lower down as you said, but there really isn’t that much room to mount it in a reasonable location which is easily accessible.
Maybe I'm missing something, but the goal is to have as little oil making it to the catch tank (which then could continue to the plenum) as possible, right? So mounting it higher does that. Mounting low could create a siphoning effect.
Hey, only a small amount which I captured on film, couldn’t notice anything really from start up whilst in the car. To be honest, I didn’t really notice too much of a difference after just fitting the AOS, that’s why I then cleaned out the intake etc. and fitted the catch tank. Noticed the exhaust tailpipes stayed a bit cleaner for longer but even with the catch tank, after a long period, there’s still a very slight amount of oil getting back into the intake. You can’t stop it completely. I opened up my old AOS and it was fine, the diaphragm inside was ok. Good to change as a precaution.
Hey, It takes a couple of hours to be fair once you remove the old one etc. You need to reposition the two vacuum valves which isn’t an issue. The biggest problem is it’s a tight fit. There’s not much clearance between the throttle body/intake pipe and the rear bulkhead. I positioned the throttle body and pipe first, leaving it loose, then put the plenum in place and then bolted it up. Good luck
Hello, I installed the same catchcan, but my question is whether you connected your catchcan before the AOS or after the AOS? Mine was installed after the AOS. I do have the impression that I have less power. Kind regards Attila from Belgium
Hey, yes mines installed after the AOS, it would be quite difficult to install it before. If you feel like you have less power, I would double check there’s no air leaks or a higher restriction to the air flow through the catch can system
@@GarageTechAutomotive Hi, Thank you for your reply 😉. Also my oil consumption has increased!! How can I upload a picture of my installation ? Kind regards Attila from Belgium
@@user-ti1eg9fv5g you can’t share a photo annoyingly, if you follow me on instagram you can send me a private message on there, instagram.com/garagetech_?igshid=OGQ5ZDc2ODk2ZA== link also in my bio 👍🏼
The pipework for the catch can reduces to less than 10mm at the inlet and outlet of the catch can unit. Was there any issue with the narrower pipe diameter, back pressure etc?
Hi Glen, no problem so far, this was a concern when putting this kit in, but there’s plenty of back pressure/vacuum available, good way to check is releasing the oil filler cap while the engine is running. If there’s plenty of suction and the engine hunts, due to unmetered air, it’s working correctly. I’ve just done about 1000miles now so will be opening it up to see what’s been collected.
@@GarageTechAutomotive Hey! Any updates on how much it has collected? I track my 987.2 and have some oil consumption on track. I may add a catch can to try and see if I'm burning it off through the PCV.
@@PeterSierraRacingSupply Hi Peter, yes, I’ve upload a video recently after 1000 miles. The catch tank did collect some oil, about 10ml but there was still evidence that some oil was still making its way into the intake, and this was also after having a new AOS too. I’ve now made some modifications to the catch tank to hopefully filter some more of the oil out. I’ve also recently done a track day and haven’t needed to top up the oil since fitting the catch tank and new AOS. ua-cam.com/video/A0BXVV4TlBI/v-deo.html
@@GarageTechAutomotive Hi Thanks for the reply would be good to see if there is any oil collected after 1000 miles - my guess would be about an egg cup full.
Short answer is yes, You could just let it vent to atmosphere but there are a number of disadvantages for doing that, 1. It’s illegal in the UK, this would be an MOT failure as the crankcase gasses have to be diverted back into the engine. The gasses are toxic. 2nd a vacuum in the crankcase is better for the oil seals, less chance of oil leaks due to increased pressure and draws out all the gasses which could cause corrosion. Also a high pressure in the crankcase would reduce power.
@@whateverrrrrr123 what sort of breather are you thinking about, those little filters? You would likely still have the same issues with higher than wanted pressure in the crankcase plus the oil mist will make a mess of the engine bay after a while, even with the filter on.
![[UA] Team Vitality проти NAVI | IEM Cologne 2024](http://i.ytimg.com/vi/wttO1zVRTC0/mqdefault.jpg)
Top tip: if you are struggling to fit rubber pipe, soak in for a couple of min in very hot water, it makes life a lot easier
People are missing the big picture. The amount of oil in the catch can is almost irrelevant. The most important thing is that the amount of oil making it to the plenum is minimized. From your 1000 mile later follow up video, it appears that has been improved but not eliminated and with only 5-10 ml in the tank, that means the new AOS is doing the bulk of the work and doing it reasonably well. The tank is only doing a little bit. At least it's cheap, light, and easy, so can't really hurt.
To effectively get vaporized oil to fall out of suspension (air), you need some combination, volume, time, low temperature, and places for the microdroplets to seed.
This is where a large catch tank could benefit--not because you need to capture a large volume of oil, but because high velocity air in a small tube slows down when it enters a larger volume, like a river dropping it’s sediment at the ocean delta. High volume=low speed=more condensation. The air also has extra time to traverse a larger volume (especially with baffles, which also provide seeding opportunities) before being routed back to the intake. Longer time=more condensation. I don’t know the solubility curve of oil in air at various temperatures and pressures or if the difference between ambient vs engine bay temps would be significant enough to be worthwhile, but lower temperature=less solubility=more condensation.
So an ideal solution would be an infinite volume with a heat exchanger and plenty of capture points, but that just isn't practical. Would an inline oil cooler mounted at the side vent, then routed to a larger tank make sense? Maybe. Would all this complexity and expense be better then walnut blasting your intakes every few years? I'm skeptical.
Hey thanks for comments, great points about the volume etc. and agree a bigger catch tank would be more beneficial. Something I’ve been considering but just haven’t got round to doing it.
@@GarageTechAutomotive If you were to be able to weld up an aluminum one that fit behind the side vent and had some cooling fins, perhaps it col help even more.
@@plus790 yeah a custom made one would be ideal, that’s one of the issues with the off the shelf versions is that space is limited in the engine bay, especially if you want somewhere where it’s easy to access.
Thank you so much for share!This is really help!!!
No problem 👍🏼
Great stuff, will be trying this out.
I took out the brass filter inside as it causes quite a bit of pressure /resistance. I reckon the round baffle plate inside would suffice. mine is not direct injection so shouldbe ok I guess.
That is basically the complete function of the catch can. Without it it's pretty useless.
The tube/pipe reducers,/adaptors, are they automotive parts or general hardware items, could you show a link, I'm having difficulties locating some in Australia thanks
Hi Nigel, I got the reducers from eBay link below.
www.ebay.co.uk/itm/281671172701?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=SyBYxUWaS32&sssrc=2349624&ssuid=ysnWy0-bT4m&var=&widget_ver=artemis&media=COPY
Did my air oil separator last year , this is a interesting upgrade , are you running the standard 74mm throttle or 82mm on your ipd plenum? Very interesting videos you know your stuff ..
Hey, thanks for the comments, This has the 82mm throttle body 👍🏼
how open did you dump out collected oil? And I am wondering location of catch tank should be lower or higher than actual AOS outlet?
Hey, I normally check it every few months, depending on the mileage, I’d recommend every 1000miles until you get some idea of how much is collected in that period. I’d also check it after a track day etc. ideally I would have placed it lower down as you said, but there really isn’t that much room to mount it in a reasonable location which is easily accessible.
Maybe I'm missing something, but the goal is to have as little oil making it to the catch tank (which then could continue to the plenum) as possible, right? So mounting it higher does that. Mounting low could create a siphoning effect.
Hi Darren, were you getting a puff of blue smoke on start up and did it clear after fitting the new AOS?
Hey, only a small amount which I captured on film, couldn’t notice anything really from start up whilst in the car. To be honest, I didn’t really notice too much of a difference after just fitting the AOS, that’s why I then cleaned out the intake etc. and fitted the catch tank. Noticed the exhaust tailpipes stayed a bit cleaner for longer but even with the catch tank, after a long period, there’s still a very slight amount of oil getting back into the intake. You can’t stop it completely. I opened up my old AOS and it was fine, the diaphragm inside was ok. Good to change as a precaution.
Good afternoon, where can I buy that oil decanter and the accessories for the 987.2? Thank you
Hey, I got the catch can from Amazon and the hoses etc from eBay 👍🏼
Nice work, i have just purchased the IPD comp plenum and GT3 throttle body for my R and was woundering how long the install took you ?
Hey, It takes a couple of hours to be fair once you remove the old one etc. You need to reposition the two vacuum valves which isn’t an issue. The biggest problem is it’s a tight fit. There’s not much clearance between the throttle body/intake pipe and the rear bulkhead. I positioned the throttle body and pipe first, leaving it loose, then put the plenum in place and then bolted it up. Good luck
@@GarageTechAutomotive Thank's for the response, that's excatly how i was thinking of tackling it. love the videos, keep up the good work !
Hello,
I installed the same catchcan, but my question is whether you connected your catchcan before the AOS or after the AOS?
Mine was installed after the AOS.
I do have the impression that I have less power.
Kind regards
Attila from Belgium
Hey, yes mines installed after the AOS, it would be quite difficult to install it before. If you feel like you have less power, I would double check there’s no air leaks or a higher restriction to the air flow through the catch can system
@@GarageTechAutomotive Hi,
Thank you for your reply 😉.
Also my oil consumption has increased!!
How can I upload a picture of my installation ?
Kind regards
Attila from Belgium
@@user-ti1eg9fv5g you can’t share a photo annoyingly, if you follow me on instagram you can send me a private message on there, instagram.com/garagetech_?igshid=OGQ5ZDc2ODk2ZA==
link also in my bio 👍🏼
The pipework for the catch can reduces to less than 10mm at the inlet and outlet of the catch can unit. Was there any issue with the narrower pipe diameter, back pressure etc?
Hi Glen, no problem so far, this was a concern when putting this kit in, but there’s plenty of back pressure/vacuum available, good way to check is releasing the oil filler cap while the engine is running. If there’s plenty of suction and the engine hunts, due to unmetered air, it’s working correctly. I’ve just done about 1000miles now so will be opening it up to see what’s been collected.
@@GarageTechAutomotive Hey! Any updates on how much it has collected? I track my 987.2 and have some oil consumption on track. I may add a catch can to try and see if I'm burning it off through the PCV.
@@PeterSierraRacingSupply Hi Peter, yes, I’ve upload a video recently after 1000 miles. The catch tank did collect some oil, about 10ml but there was still evidence that some oil was still making its way into the intake, and this was also after having a new AOS too. I’ve now made some modifications to the catch tank to hopefully filter some more of the oil out. I’ve also recently done a track day and haven’t needed to top up the oil since fitting the catch tank and new AOS.
ua-cam.com/video/A0BXVV4TlBI/v-deo.html
@@GarageTechAutomotive Hi Thanks for the reply would be good to see if there is any oil collected after 1000 miles - my guess would be about an egg cup full.
Thanks 🙏
A question pls … is there any way of deleting the AOS totally?
Short answer is yes, You could just let it vent to atmosphere but there are a number of disadvantages for doing that, 1. It’s illegal in the UK, this would be an MOT failure as the crankcase gasses have to be diverted back into the engine. The gasses are toxic. 2nd a vacuum in the crankcase is better for the oil seals, less chance of oil leaks due to increased pressure and draws out all the gasses which could cause corrosion. Also a high pressure in the crankcase would reduce power.
@@GarageTechAutomotive thanks a lot would a breather help if there is space ?
@@whateverrrrrr123 what sort of breather are you thinking about, those little filters? You would likely still have the same issues with higher than wanted pressure in the crankcase plus the oil mist will make a mess of the engine bay after a while, even with the filter on.
@@GarageTechAutomotive thanks wow ok then I surrender….will do what you did…
Hope to visit you one day!!!
@@whateverrrrrr123 no problem, I’ve done 1000miles with this setup now so just about to open the can up and see what it’s collected.