Oil Catch Can

[matthewai]

hello all , kinda a general question here but didn't want to start a new thread , my question is if you are running an oil catch can with a turbo does it make sense to have a crankcase vent ? or will it even do anything

[06YarisRS]

Originally Posted by matthewai

hello all , kinda a general question here but didn't want to start a new thread , my question is if you are running an oil catch can with a turbo does it make sense to have a crankcase vent ? or will it even do anything

I am running a catch can on my turbo setup and have a crankcase vent. It will reduce vacuum in the crankcase when the PCV system is operating. I think you have to allow air back into the crankcase or you'll get too much vacuum in there. Post #226 in my thread here talks about this a bit.

https://www.yarisworld.com/forums/sh...her#post824972

[matthewai]

Originally Posted by 06YarisRS

I am running a catch can on my turbo setup and have a crankcase vent. It will reduce vacuum in the crankcase when the PCV system is operating. I think you have to allow air back into the crankcase or you'll get too much vacuum in there. Post #226 in my thread here talks about this a bit.

https://www.yarisworld.com/forums/sh...her#post824972

I see I see, so I've also seen those ones that screw on in place of the oil fill cap and they have a one way check valve ball, now I was understanding that you only want the air to be able to escape the crankcase not be sucked in through the vent. and I guess my original thought was since im running the oil catch can it adds more lines, seals, and connections where gasses could potentially escape, so im just trying to figure out if I should add the crankcase vent so any vapor would exit through that instead of some other part failing. even though im confident with the install and have seen no leaks

photo is not of my engine bay

[06YarisRS]

Originally Posted by matthewai

I see I see, so I've also seen those ones that screw on in place of the oil fill cap and they have a one way check valve ball, now I was understanding that you only want the air to be able to escape the crankcase not be sucked in through the vent. and I guess my original thought was since im running the oil catch can it adds more lines, seals, and connections where gasses could potentially escape, so im just trying to figure out if I should add the crankcase vent so any vapor would exit through that instead of some other part failing. even though im confident with the install and have seen no leaks

photo is not of my engine bay

Yeah, at one point I thought I had it all figured out, but it's been a while, so I forget the reasons. I can't remember all the logic I used to determine that I needed one. However, as mentioned in the link provided, when I plugged the vent hose, vacuum increased to the point where the engine was going to stall. I toyed with re-routing the exit of my oil catch can back into my pre-throttle body charge pipe. In my research, I found many varying opinions, some suggesting that I should completely cap off/eliminate the PCV system. I am now running well, with reasonable fuel trims, so I don't plan on messing with my current configuration.

Do you have any additional info and pics of your setup?

[matthewai]

Originally Posted by 06YarisRS

Yeah, at one point I thought I had it all figured out, but it's been a while, so I forget the reasons. I can't remember all the logic I used to determine that I needed one. However, as mentioned in the link provided, when I plugged the vent hose, vacuum increased to the point where the engine was going to stall. I toyed with re-routing the exit of my oil catch can back into my pre-throttle body charge pipe. In my research, I found many varying opinions, some suggesting that I should completely cap off/eliminate the PCV system. I am now running well, with reasonable fuel trims, so I don't plan on messing with my current configuration.

Do you have any additional info and pics of your setup?

its stock right now (k&n drop in) I added the catch can about a month ago just because I think its a good idea to keep the engine cleaner. havent noticed any difference but I dont even know what id be looking for or "feeling" for by how it drives or uses gas . I usually put the mid octane fuel in but maybe I should be running the highest octane ? yes its not a Yaris ahhh sorry

[06YarisRS]

Originally Posted by matthewai

its stock right now (k&n drop in) I added the catch can about a month ago just because I think its a good idea to keep the engine cleaner. havent noticed any difference but I dont even know what id be looking for or "feeling" for by how it drives or uses gas . I usually put the mid octane fuel in but maybe I should be running the highest octane ? yes its not a Yaris ahhh sorry

Elantra N-Line?

I doubt you'd ever feel any difference. Have you emptied you catch can yet to see what's in it? I have the hardest time remembering to empty mine. I actually remembered last week. I have a ball valve drain on mine. I emptied what would be probably 1/8 of the full volume of the can. It looked like the typical chocolate milk color and stinky as usual. I probably had driven 1500 kms. Not a lot, but much better than having it sucked back into my manifold, weakening my effective octane rating.

I don't think you'll see any benefit to running higher octane (premium) gas. As far as I know, your engine is naturally aspirated with a compression ratio under 10:1.

[matthewai]

Originally Posted by 06YarisRS

Elantra N-Line?

I doubt you'd ever feel any difference. Have you emptied you catch can yet to see what's in it? I have the hardest time remembering to empty mine. I actually remembered last week. I have a ball valve drain on mine. I emptied what would be probably 1/8 of the full volume of the can. It looked like the typical chocolate milk color and stinky as usual. I probably had driven 1500 kms. Not a lot, but much better than having it sucked back into my manifold, weakening my effective octane rating.

I don't think you'll see any benefit to running higher octane (premium) gas. As far as I know, your engine is naturally aspirated with a compression ratio under 10:1.

have not emptied it yet and yeah i dont think id ever notice any difference either i guess i just like the idea of taking measures to keep the engine cleaner if possible