byrdman454

I am making a crankcase vent system for my '84 Euro similar to what DR has done with his Sharkvent. I had a quick question about the port that is added to the passenger side valve cover. DR adds a port to the farthest forward plug on that valve cover. There are 6 plugs in each valve cover. Why are there 6 plugs and what are they used for? Is there any reason I cannot put my port in any of the 6 instead of the forward one?

Here is a link to DR's system schematic:
http://www.928gt.com/productspecs/40583.htm

Dave928S

The plugs are removed to provide access to six of the cambox bolts, which secure the cam box to the head. Wouldn't make any difference which one you put the line into, but it may affect the desired performance of the system, so I'd email DR and get his view.

GlenL

I'm not sure why the cam tower needs a vent. Or why you'd do just one. The drain back holes are pretty big and all the blow-by goes into the crankcase. Perhaps there's a bit of leakage up the exhaust stems but that'd be even on the two sides.

Are you doing a splash guard below the oil filler housing? Look for multiple designs on that. 928I offers one.

byrdman454

Is the splash guard from 928intl good for the 16v and 32v? Can the oil filler housing on the 16v be removed and a splash guard installed without removing the water bridge?

GlenL

Dunno. Should be.

No. Only the old DEVEK-style flat plate can be slipped in. That's hard, too. The water bridge bolts are risky, it's true.

byrdman454

Is there any easy way of removing just enough coolant so the water bridge can be removed without dumping all the coolant out of the radiator drain? I assume the waterbridge/thermostat is submerged at all times.

GlenL

Just pop the valve on the bottom of the radiator. It'll drain enough. Yes, the bridge is filled.

The bridge bolts go into the coolant so are prone to corrosion. That'd be the challenge.

Fabio421

Yes you can, but you will need to remove the center plenum of the spider so that you can slide the oil filler housing back towards the firewall to get it out from under the bridge. This method is much less trouble than removing the water bridge. If you are going to put an oil control device below it, I highly reccomend the Kuhn scrubber. I tried 928 Motorsports oil control plate and saw no substantial difference in the amount of oil I was ejecting, and I was ejecting ALOT of liquid oil. ( non stock breather system on a boosted 928 ) I installed the Kuhn scrubber and I saw the total elimination of ejected liquid oil. I still got some oil vapors and mist but I then added a pro-vent to take care of that.

GlenL

Actually, I stand corrected!

byrdman454

Excellent! This is what I was hoping for. I am removing the center plenum anyway to plug the stock CVS line that is connected below the throttle body. Thanks Fabio!

I love Kuhn's scrubber, but I already have an extra 928INTL device waiting for another car I can use in the meantime. I think that scrubber and the provent should work great on a non-boosted car. This combo did great on my S4.

byrdman454

Well, there was enough room to remove the oil filler housing by removing the plenum and TB. Unfortunately, there was not enough room to install the oil control baffle. The water neck casting would not allow it to be installed since the baffle was too tall. Oh well, the oil filler housing was leaking anyway so at least I got that fixed.

Fabio421

I've done this job twice and never removed the water bridge. I installed the 928 Motorsports baffle which is pretty thick. I also installed the Kuhn scrubber which is thinner. I didn't have a problem with either one. Can you post a picture of what problem you are having with the water bridge interfering? How thick is the baffle from 928 Intl?

Ducman82

removing the WB is WAY to much work... Second the Kuhn scrubber....

IcemanG17

All 16V have a pretty good oil breather from the factory.....WORLDS better than the later 32V versions....they come stock with a built in seperator... The OB oil pan is the best for a 928 as well....

You can get excessive oil ejection via the airbox (pass side low) IF the oil level is kept near full and extended running time around redline.....this is assuming a 100% healthy engine...if you have any type of issues with rings sticking or ring flutter....among other engine issues the amount of blowby-crankcase pressure gets insane and oil ejection into the airbox gets extreme.....

What are your smog laws? If they are decent....I would cap the top breather line by the oil filler and run it to a simple breather and-or catch can..... here is a pic how I did it

byrdman454

It looks like the Kuhn seperator is narrower and tapered. The 928intl one is not. Here is a pic from their website.


I agree that the 16v engine seems to be better than the 32v with oil ingestion in the intake. The amount in the J-tube was substantially less than the 32v engines I have seen. With this in mind, I decided to pass on adding to 928intl oil control baffle and just install a Provent with a home-made system similar to DR's Sharkvent.

I added both the 928intl baffle and a Sharkvent years ago on my S4. I plan to add the baffle and a home-made Sharkvent copy to the S3. The Sharkvent is not available from DR right now, so I had to make one from scratch.