Cheap AOS
I keep reading about people changing a bad AOS and having it go bad again, a year or so later. Are there any upgrades available? I'd like to spend more and trust that it will last a while. I'm about to do mine as a preventive maintenance item and I'd like something good.
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Plumbing a Jeggs AOS in line into mine has worked. Not the solution for everyone...http://986forum.com/forums/uploads01...1438475133.jpg
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Was the Jegs unit a complete replacement or an add-on to the Porsche AOS
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AOS mods & upgrades
"Plumbing a Jegs AOS in line into mine has worked. "
This would be a great way of being able to check the volume of oil being passed by the AOS. Useful if you think it is beginning to fail. If you want something more OEM looking ,perhaps one of these ? Oil Catch Cans But the critical part IMHO is -how ,exactly did you connect it? What fittings and where ? It looks/measures as if a 3/4" line would work. We are not alone with this issue.The BMW guys have also fitted oil separators: My CVV (Oil Separator) DIY Journey in Pictures - Bimmerfest - BMW Forums Lots under "catch cans" on Fleabay. Need one with AN12 or 3/4 or 20mm fittings, perhaps 5/8"? This might work/ The orientation of the fittings is convenient. http://www.ebay.com/itm/SHR-Tru-Billet-Universal-Oil-Separator-Black-/221738029620?hash=item33a09dd234&vxp=mtr http://www.silverhorseracing.com/shr-tru-billet-oil-separator-universal.html http://www.stangmods.com/JLT-Oil-Separtor-p/01369.htm |
Isn't there an opportunity for someone to make a better aftermarket unit? I wonder how much longer these will be available from Porsche.
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There is a theory that you can upgrade the diaphragm (the part that rips!) with a superior one scavenged from a BMW AOS.
It would be a great diy to replace the cheapo OEM diaphragm with a piece of Viton or similar/better? http://www.amazon.com/Fluoroelastomer-Durometer-Smooth-Finish-Backing/dp/B00CCGYGEG |
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Someday I plan to flip my "T" plenum upside down to move the AOS connection to the drivers side where there's more room to install a catch can etc. inline.
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When that bowl in the supplemental AOS gets about 1/4" of oil in it I will pour it back into the oil filler. When I'm AXing or driving hard, hardly any oil accumulates at all. When I'm poking along on the interstate/ steady state low throttle driving I'll drain it about every 360 miles or per fuel fill-up. |
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 !! http://www.ebay.com/itm/VITON-FLUOROELASTOMER-Disc-Rubber-Gasket-Material-9-inch-Disc-x-1-16-1-piece-/261556610601?hash=item3ce5fd2629 |
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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 |
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