Net Seven

iTrader: (5)

Can everyone post some pictures of locations they installed their oil catch can? I want to get an idea where to install mine.

thanks!

Mahjik

iTrader: (1)

Not a lot of people have them since they are mainly for road racing use. You can check Crispy's site as he has some pics:

http://reganrotaryracing.tripod.com/catch.htm

ptrhahn

iTrader: (9)

Here you go:

felix_is_alive

here ya go

foursquarejibber

I don't know if this is true about rotaries, but isn't the correct way to install 2 catch cans?

rotorbrain

very slick install!!! i dont know much about the greddy can, but is it "okay" in that position? i would have assumed it should have been "standing up". i dont know what the internals look like, though. . . so, please inform. . .

i havent ever heard of anything like that. i dont know why anyone would need more than one, unless it was an over-engineering deal. . . where they want to make sure no oil is getting back into the intake. .

ptrhahn

iTrader: (9)

I don't know why you'd need a second can unless there's a second source that isn't connected to the first.

foursquarejibber

This is what I learned when I was in the Subaru world:

There are a variety of ways to install a catch can. There's one right way, two sort-of right ways, and some would argue that at least one common installation method which is wrong.

Sort of right ways:
1) Disconnect the hose which runs between the PCV valve and the turbo inlet pipe. Run a line from the PCV to the catch can, and another line from the catch can to the turbo inlet hose.

2) Disconnect the hose running between the crank case breather lines and the turbo inlet pipe. Run new hose between the breather line and the catch can and another hose between the can and the inlet pipe.

Right way:
Use two catch cans. Configure one as discussed in option one and the other as described in option 2. For optimal effectiveness, this is the way to go.

felix_is_alive

rotorbrain...the greddy can ,can be configured to work both standing up or laying down , its mostly so you can use the sightglass (not pretty clear in these pictures) ,pretty neat unit


Maybe 2 catch cans for subarus ,because their boxer engine has two banks ???...I HAVE NO IDEA IF THIS IS TRUE, i am just thinking why you would need 2 catch cans, so please no flames

Eggie

Just made this setup. The compression fitting's tube runs down into the middle of the can, pointing away from the outlet.

ptrhahn

iTrader: (9)

There's no difference between the "crank case breather line", the "line from the PCV", and "The line to the turbo inlet"... they are all the same in the sense that they are sourced from the double nipple on the filler neck.

dubulup

looks towards the intake...

ptrhahn

iTrader: (9)

Where's you get the bottle? Did you have to add the second inlet?

3rd Gen Jeremy

Can somebody give me a clear definition of why a catch can is necessary? I know you're gonna say blowby but what is blowby? How does it occur and how does an extra port on the UIM catch excess oil? It doesn't make sense to me, please help me understand.

Thanks again,
Jeremy

7-sins

Pics are looking good guys, keep them comming. I need to find a place to put a catch can.

That looks sweet, hidden & clean. That is one of the greddy style ones layed down correct?

How much of a pain is that to empty?

dubulup

Thanks...its not bad...probably need to empty it every 10k - 15k miles or more on a solid engine. I just empty it when I clean my intake filter. (it is the Greddy one). I ran a rubber hose to the filler cap...and a silicon one pulling vacuum from the intake.

as oil heats up it lets off vapors...catch can is placed in between the oil filler neck and a vacuum source (turbo intake). This draws the vapors out of the oil pan, and they collect in the can. Higher the boost, hotter the oil, more vapors...stronger the vacuum.

3rd Gen Jeremy

So the stock PCV allows the oil vapor to go into the UIM? What's wrong with the oil vapors being in the oil reservoir? What do that do that is so detrimental?

I've blocked off my PCV hose from the filler neck to the UIM because I broke the valve. If I were to run 14 - 15 psi, would I need a catch can?

Jeremy

Mahjik

iTrader: (1)

It is possible to over pressurize your oil pan and blow the seal.

An oil catch can has nothing to do with oil vapors. When driving the car hard on a road course with a lot of lateral g's, the oil can and will creep up the oil filler neck. Where does it go? Well, it then take the path of least resistance which is the "down" part of the oil filler neck and gets pulled into the intake area. So, the goal of the catch can is to insert it before it gets pulled into the intake.

All you need to do is just vent one of those lines back to your intake or some other vacuum source. If you aren't running the car hard on a road course, an oil catch can is not going to do much for you except add to your 'mod list'.

3rd Gen Jeremy

So if I've eliminated the top hose going to the UIM, I should put one between the lower hose and the primary intake? I have noticed oil in there recently.

By the way, everything I do in that car is sideways. I'm a lateral G junkie and I do plan on tracking the car once I get it sorted out the way I want it.

Thanks for you help.
Jeremy

Mahjik

iTrader: (1)

Yes. That's the constant vacuum source so it doesn't need a check valve like the UIM connection. Eventually, you can insert a catch tank into the line somewhere before the intake.

Scrub

iTrader: (25)

I mounted mine right behind the I/C as you can see in the pic below. Even though I don't road race (yet) I still catch a decent amount of oil.

dubulup

I don't know...I get some frothy **** in my can, and I understood that to be from hot vapors.

my engine build wasn't the tightest...so it could be oil/gas vapors. My oil would smell like fuel and get dirty dirty after 1500mi or so. So, I changed my oil quite often.

Mahjik

iTrader: (1)

Right, but the vapors would be vented regardless of the catch can since the oil neck is plumbed to a constant vacuum source. The idea is to just catch anything that's not vapor before it goes back to the intake.

ptrhahn

iTrader: (9)

I didn't think you needed it if you don't track. I don't get a drop in my can unless I'm on track.

dubulup

gotcha...