Alin
Diehard Car Enthusiast!
I know there are about 10 different previously created threads on this crap because I just read them all. However, there are so many different responses that contradict each other BOTH in terms of which system to use. An AOS or a catch can. Now, a vented catch can or a recirculated one?
Gahhhhh!!!! Some people say you don't even need one.... So we can make this ultimate thread on AOS and catch cans and then sticky it! Let's begin:
Air Oil Separator, catch can, or both? If a catch can, recirculating or a vented? If AOS, which brand? I want to come to ONE, best conclusion!
Here are the top brand I keep seeing over and over again:
Grimmspeed
Crawford
Morose
IXIZ
Prova
http://scoobytuner.com/products/?vApplicationID=25&sfID1=356&sfID2=365
Catch cans:
http://www.jmfabrications.com/store/products/Deluxe-Oil-Catchcan.html
http://www.allstarperformance.com/product.htm?prod=25
Then, there is this:
https://www.mann-hummel.com/fileadmin/user_upload/service/catalogues/pdf/ProVent_en_2013.pdf
And last, but not least, a cheap alternative to an AOS.
http://www.speedelement.com/index.p...oduct_id=2980&option=com_virtuemart&Itemid=38
So, what do I go with?! :angry:I really want to listen to everyone, but all these different answers are driving me insane. Same with the other forums. Everyone is just contradicting themselves on which system is best and why. :lol: :banghead: :rambo:
Gahhhhh!!!! Some people say you don't even need one.... So we can make this ultimate thread on AOS and catch cans and then sticky it! Let's begin:
Air Oil Separator, catch can, or both? If a catch can, recirculating or a vented? If AOS, which brand? I want to come to ONE, best conclusion!
daaaaaaaaang, four pages and we are still discussing/wondering? well let me put the nail in the coffin on this one. With everything that everyone has been saying in reference to "well it didnt come from the factory like that for a reason" yes, you are right. The way cars are built and constructed they have to meet emission requirements ALL across the board and build them ALL the same (thats how an assembly line works to maximize profits). well we cant "dump" anything into the atmosphere because gore swears it tears up the ozone layer. That's why, stock, these cars come with all the fancy performance restricting parts that if you change them (expecially in california) you run the risk of failing emissions testing. either mechanical (cats, O2 sensors, changing the tune) or visual (evap system). all those things keep everything environmentally friendly but kills performance. so when it comes to catch cans/venturis/aos WHATEVER those are in reference to the evaporative emission control system (evap). the way the stock system works is that is routes all of the oil precipitants or moisture from the block and heads back into the intake tract for it to burn. Some of it is valved and some of it is not(problem). the purpose of the valves is to prevent positive boost pressure being pushed into the motor thus deterring the chance of positive crankcase pressure. so far no advantages right? as time goes on you will start seeing things like this: View attachment 4566 in some of the evap lines due to moisture in the oil or things like this: View attachment 4567 and View attachment 4572 with the vapors building up or actual oil being pushed back through the intake which causes oil consumption and making the intercooler less efficient. it also coats sensors and creates buildup on the injectors and valves.
so whats the relief? well one of the worst things out there i have seen in the GS AOS. why? because this:http://forums.nasioc.com/forums/showthread.php?t=2228499 It sounds good the way GS sells it but common! its all marketing and from a mechanical standpoint its a horrible design. I cant believe how something like that can cost so much and THEN be ineffective.
option 2: the crawford AOS. Again on paper it sounds good, but my OMG its expensive and do you really need coolant running through it? not only that moisture builds up in the oil and it really doesnt get "caught" or separated and the crawford AOS STILL runs it back into the intake so for me, no thanks.
the BEST option, #3: this: http://www.elementtuning.com/images/products/Element Competition Catch Can.jpg or this: https://www.himni-racing.com/images/catch can rx8.jpg this is what bip power hondas and v8's use. yes, you might have to deal with possible fumes and extra maintenance but that is the sacrifice when it comes to modifying cars and going into more higher performance.
if your catch can system is working right you'll see things like this: View attachment 4568 and this: View attachment 4569
now do you really want that crap being recirc into your expensive built motor? or just avoiding a rebuild all together? the crawford markets their product well when it comes to "low maintenance" and looking good in theory but to pay triple for that? or even build your own catch can for less? no thanks. catch cans is a simple yet good design that has been used for YEARS thats PROVEN and they come in all sizes and designs and have the possibility to be cheap, expensive, customizable, WHATEVER...
and to the person who that something about lateral g's and what not; garbage. there is a reason why the oil pan and valve covers are baffled and there are oil galleys positioned how they are. how do you think baja trucks, and drag cars deal with oil starvation? autox cars run the lowest risk and even still there are better oil pans that we can purchase if you want peace of mind. as long as the oil pump can still suck up oil, its all good.
and lastly, thanks JJ for putting this topic on facebook. I wouldnt have been able to give my input if it wasnt for that...
Just a thought hear... Not sure you would want it to go back into the system at all. In some cases like running E85 in the winter time, there is an awful lot of moisture that winds up as blowby and the catch cans condense and separate it well enough.
You definitely don't want this water finding it's way back into the engine. I pull two cups of water form my catch cans every two to three weeks.
Here are the top brand I keep seeing over and over again:
Grimmspeed
Crawford
Morose
IXIZ
Prova
http://scoobytuner.com/products/?vApplicationID=25&sfID1=356&sfID2=365
Catch cans:
http://www.jmfabrications.com/store/products/Deluxe-Oil-Catchcan.html
http://www.allstarperformance.com/product.htm?prod=25
Then, there is this:
https://www.mann-hummel.com/fileadmin/user_upload/service/catalogues/pdf/ProVent_en_2013.pdf
And last, but not least, a cheap alternative to an AOS.
http://www.speedelement.com/index.p...oduct_id=2980&option=com_virtuemart&Itemid=38
So, what do I go with?! :angry:I really want to listen to everyone, but all these different answers are driving me insane. Same with the other forums. Everyone is just contradicting themselves on which system is best and why. :lol: :banghead: :rambo: