Originally Posted by sgrice (Post 1035222)

So sorry - Once again, the pictures are not working. I will work on getting the pictures added correctly.


Edit - pics hopefully working now.

Originally Posted by ZetaTre (Post 1022806)

The original design was not effective enough so, as some may have read on the other board, I actually went ahead and installed a Mann+Hummel ProVent 200 separator.

I now have about 15,000 miles on the setup and I'm extremely pleased with the results. The oil in the intake has completely disappeared and the oil level in the sump has not declined.

I went through a few iteration and testing to ensure that the crankcase would not pressurize under any driving conditions. I have also modified the dipstick tube to make it the return line for the filtered oil and make the system completely closed loop.

I'm now refining the design of the takeoff plate: someone I know was able to scan the profile of the original CCV and machine the plate on CNC machine for a perfect design. I also found an aluminum elbow and I'll have it TIG weld to the plate for a clean and professional design. The plate currently mounted on the car is the proof of concept I made from a 1/4" aluminum plate cut to shape using a jig saw and soldering a copper elbow: it works but it's not pretty and the solder is fragile and I already broke it once while replacing the hose.

Also the hoses I originally used for the long term testing was a duct made of thermoplastic rubber: it turned out that it is either too porous or not resistant to the oil because the one running from the valve cover to the filter (which carries unfiltered fumes) have developed a film of oil on the outside. I went back to the Gates rubber hoses I had originally but have identified some corrugated nylon conduits that I may try if the rubber hoses don't work.

Some of the key takeaways of the project:

REROUTING THE BRAKE BOOSTER LINE

This was necessary to make enough room for the Provent

http://i259.photobucket.com/albums/h...628_130435.jpg http://i259.photobucket.com/albums/h...628_130515.jpg http://i259.photobucket.com/albums/h...628_130443.jpg

MAKING THE BRACKET TO SUPPORT THE PROVENT

Now that the brake booster line is out of the way I removed the bracket that was holding it...

http://i259.photobucket.com/albums/h...628_131233.jpg

and used it as a template to make a bracket that would go in the same location to hold the ProVent 200

http://i259.photobucket.com/albums/h...628_141313.jpg

See if it fits...

http://i259.photobucket.com/albums/h...628_141649.jpg

And install the ProVent 200...

http://i259.photobucket.com/albums/h...628_142828.jpg http://i259.photobucket.com/albums/h...628_145107.jpg

Originally Posted by sgrice (Post 1035347)

Split71 - I would say my 35d does not use an unusual amount of oil. I'm usually down about a quart when an oil change is due. For me, that's been about a quart every 10-12,000 miles. So (just as for ZetaTre) the reason to think about doing this is not because of oil usage, but because of trying to limit carbon build up.

Dalecan - ZetaTre originally made a series of posts over on bimmerfest. As you will see, he uses the ID of lpcapital over there. His first post (the link is here) is titled "Rather simple idea to reduce oil passing through crankcase?" Then a few months later he made a second post (the link is here) that is titled "Improving on a "Rather simple idea (aka Version 2.0)." He summarized those two posts into the beginning of this post. Though the post here covers the highlights, it is very interesting to read the original posts and see how things evolved over time, with obviously a lot of thought and effort going into it.