Cheap AOS

[BYprodriver]

Originally Posted by Gelbster

Interesting progress here.
There seem to be 3 parts to the AOS upgrade issue?
1. substitute barbed brass pipe connectors into the stock plastic connections of the AOS - cut +epoxy.This allows easy connection of generic hose.
2. collect any oil condensate from a correctly functioning AOS in a small catch can -like the Jegs one linked previously.
This also serves as a catch for any larger volume of oil dumped when the AOS diaphragm begins to fail . Functions as a visual early warning system ?

3.The big challenge is to upgrade the material of the diaphragm to something that is unaffected by heat & oil fumes. Viton seems the obvious choice but I am guessing. Replacing the diaphragm would require careful slicing of an old AOS and then glue-ing in a Viton replacement. A 9" diam plain Viton diaphragm is $7 on EBay.I have no idea if it would work but is sure big enough for several attempts !!
Viton Fluoroelastomer Disc Rubber Gasket Material 9 inch Disc x 1 16" 1 Piece | eBay

I have wanted to do this but never get around to it, I'll send you my extra AOS if you are ready to experiment.

[Gelbster]

Bill ,
I would be pleased to try this. My engine is still out of the car so the timing is perfect.And my engine already has one of your pistons ,so whay not an AOS also:-).
I am apprehensive/puzzled why others have not already tried this upgrade. The modifications are simple,inexpensive,require no special tools/skill .
The AOS problem has bedeviled the M96 community for a long time ,so can it be that only Brad Roberts has this solution?Perhaps he just substitutes a complete BMW system? see links below.

The BMW AOS/vent system may be more durable than the M96(??) but it still causes adverse comments on Beemer Forums.
I would try one but am confused about the quality. Some are $50,others $150:
BMW PCV Crankcase Vent Valve Oil Separator Breather Hose Kit Premium 566 | eBay
BMW PCV Oil Separator Crank Case Vent Valve Breather Hoses Kit Genuine | eBay