John..

After farting around with numerous configurations to attempt to keep turbocharged breather oil out of the intake I have finally decided to get one of these:

http://www.homebuilt.org/vendors/pow.../rmj-aero.html

As it turns out, aircraft out there make good use of crankcase breather air-oil separators. If the 928 was not such a PITA with the breather system I would have no problem, but it is what it is. This unit should be very low in its restriction and it is small! I didn't know this, but aircraft vent the crankcase to the atmosphere.

In my case, I am going to separate the oil, then feed the drain line back to my turbocharger oil scavenging system to pump the "blown" oil back to the sump.

Those of you boostards out there know all about oil in the breather hose off of a 928 engine. I already have the Devek baffle and have wrapped a piece of aluminum 2/3 around the screen in the filler neck. Boosted gasses still like to carry off oil through the breather system. You would swear there was something broken inside the engine after seeing the oil that comes through the breather system. The breather port is just too close to the crankshaft on these cars and the windage inside there must be horrible. Turbocharging makes it even worse.

I'm tired of that Camaro-like catch can I have been using for 3 months now, plus it looks like a band-aid and stinks at idle.

GlenL

I'd like to see what's inside the can.

I looked all through this issue and settled on a big catch can. (And later accepted that there was something wrong.) It takes a lot of volume to slow down the rushing blow-by to let the oil settle out.

I'd be concerned about running the distilates back into the engine. The exhaust that carries the oil mist out is really moist and the water will condense out as well.

SilverSFR

John,

I have had the same problem. let me know if you find a solution. I added a 2'' K&N breather to the line comming off of the Oil Filler/seperator lid. This seems to help releave some of the preasure under boost. There was still a fine mist comming through the breather, so i put a wrist sweat band around it. this sounds dumb but it fixed oil vapor over everything problem.

let me know what you find out.

SilverSFR

Erik - Denmark

John,
Here you can see what I did, made a copy of the exciting oil separator and installed it in serial - I did not not lead the condensate back to the sump, just empty the separator after hard driving.
I think the best way to lead it back (if you want) that is to install a solenoid valve who is open when you stop the engine (Due to the positive pressure in the sump)
What's coming out is a mixture of gasoline, oil and water, but my engine is healthy so that's small amounts
I think the one you found will also work - Good luck!
See: http://forums.rennlist.com/upload/extra_oilsep.1.jpg

John..

I was reluctant to pump it back in as well, but I am told in the aircraft industry that if the oil is hot enough, the water vapor is driven off. Who really knows, I guess the concept is to pull it back in in small amounts, not a pre-mixed gob of crap like collects in a catch can over 10 hours of Boostarded driving.

Inside the cannister...the lower air outlet tube extends up to the top of the cannister and has 6 holes drilled in it. It is wrapped with aluminum screen, 6 times around....the oil is supposed to condense on the screen while the air travels through and out the bottem. The oil rolls down the screen and out the drain. I have the luxury of having a pump to pump it back, so it should work just fine. My oly fear is what I am putting back into the crankcase.

Lizard928

you could always have a little bucket with that soliniod that you could park at someones house you dont like and let her loose