M104-AMG

iTrader: (8)

So I found a Summit quart catch-can that has two inlets up-high, a filtered breather on the top, and a drain-valve below.

Please tell me if I'm hooking up this correctly.

I read about 15 different threads, and am completely confused.

1) remove PCV valve, and plug PCV inlet at UIM;
2) run a new line from the old PCV source (top nipple of oil-filler tube) to inlet of catch can;
3) disconnect 2nd line from oil-filler tube and extend it to 2nd inlet of catch can;
4) plug the now open nipple on the oil-filler tube.

Attached is the proposed setup.

Note: there is now NO VACCUUM from the the primary turbo to the oil-filler tube. Is that OK ?

BTW:

Can the catch-can be mounted below the intake elbow (near the dipstick) as long as the lines run UP first (strut-bar height) and then down into the catch-can ?

Is there any harm in having the PCV valve in between the oil-filler nipple and the catch-can inlet ?

M104-AMG

iTrader: (8)

Anybody ?

rynberg

I would think the best setup would be to block off the PCV feed ('95 and later cars don't even have this!) and insert the catch can in the line between the filler neck and the primary turbo inlet.

jeff p

I would also like to know how to do this. I am tired of the small drip of oil I get off the back of the secondary turbo pipe. I was told a catch can would solve this proplem.
Jeff

M104-AMG

iTrader: (8)

Would I then want a catch-can WITHOUT a breather, so it's still a closed system between the primary turbo and the oil-filler neck ?

If so, time to get a different catch-can . . .

:-) neil

Trout2

iTrader: (5)

It will still draw vacuum with the filtered breather bottle. Rynberg is correct on the install. You take out the PCV and install the line from the turbo inlet to one side of the breather bottle and run the line from the oil filler neck to the other side of the bottle. I've been running a 1 pint Jaz breather with filter from Jegs for over 2 years now with no problems.

Jack

Mahjik

iTrader: (1)

If you keep the line to the primary intake, you just "delay" the oil getting into the intake on the track. Most people cap that line so the oil won't enter the intake at all. However, you will have to make sure you aren't overfilling the catch can on your track sessions.

Here are a few modificatons that Crispy did to help slow down the oil going into the catch can:
http://reganrotaryracing.tripod.com/catch.htm

DaleClark

iTrader: (55)

On my car, I have both nipples on the oil fill neck going to a catch can, and the hole in the intake manifold and the hole on the primary turbo inlet blocked off. The can is vented - it's the Jaz super-tiny (I think it's for a cart) catch can. So far so good, but I'm not doing any track time. I just empty the catch can at oil change time, and get VERY little out.

I think a lot of it depends on how tight the motor is and how much blowby you get.

The two possible methods are the vented can or a sealed in-line can. There's also quite a bit of discussion about the benefit of vacuum on the crankcase - it's hard to say if vacuum is really necessary or not.

If you haven't done so, search the single turbo forum on this topic. There's been quite a bit of discussion there.

Dale

John Magnuson

I run a 1.5 quart NON VENTED catch can inline with the PVC system. I still use both lines HOWEVER I capped off one of the lines on the filler neck, run the second time to the catch can and then from the catch can to a T fitting back to the original two PVC lines.

This always seems to work fine for me. In my experience there is NO need for this unless you are tracking the car with very sticky tires.

Unlike some I never have a problem with filling up the catch can during a session or two. But then maybe I run stock size R compound tires so I probably don't pull the G's some of the hardcore track guys with superwide tires do.

twokrx7

iTrader: (1)

Drill and tap an aluminum oil cap and run a 1/2" line to the side of the catch can then a 1/2" line from the top of the catch can to the suction of the turbo. Cap off the PCV nipple on the intake and the oil fill neck nipples. The higher location results in less oil accumulation.

If you vent to atmosphere you might get some fuel vapor smell in the cabin after high boost depending on where your catch can is.

Mahjik

iTrader: (1)

Yep, that's pretty much what is on Crispy's site, which is a few messages above.

DamonB

Put on race tires. Go to track. Fill up can. Make huge mess

Check out the link Mahjik posted earlier as well as this one:

https://www.rx7club.com/race-car-tech-103/suggestions-fixing-oil-catch-can-problem-226214/