08-01-2015, 03:55 PM
|
#1
|
Registered User
Join Date: Sep 2014
Location: Kuna, Idaho
Posts: 308
|
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.
|
|
|
08-01-2015, 04:26 PM
|
#2
|
Rennzenn
Join Date: Feb 2005
Location: Virginia
Posts: 1,369
|
Plumbing a Jeggs AOS in line into mine has worked. Not the solution for everyone...
__________________
Rennzenn
Jfro@rennzenn.com
|
|
|
08-01-2015, 07:10 PM
|
#3
|
Registered User
Join Date: Sep 2010
Location: Foster City CA
Posts: 1,099
|
Was the Jegs unit a complete replacement or an add-on to the Porsche AOS
|
|
|
08-02-2015, 08:51 AM
|
#5
|
Registered User
Join Date: Jan 2007
Location: BC
Posts: 1,312
|
Isn't there an opportunity for someone to make a better aftermarket unit? I wonder how much longer these will be available from Porsche.
__________________
2001 Boxster, 5 spd, Seal Grey
|
|
|
08-03-2015, 10:10 AM
|
#7
|
Registered User
Join Date: Apr 2010
Location: Canada
Posts: 3,121
|
Quote:
Originally Posted by thom4782
Was the Jegs unit a complete replacement or an add-on to the Porsche AOS
|
i can't speak for 'fro, but the aos vents three different locations - both heads and the case. that would mean a lot of hose re-routing and fabbing adaptors to replace the aos altogether. prolly the easier route would be to put the aftermarket aos between the stock unit and the intake as a backup.
|
|
|
08-03-2015, 11:31 AM
|
#8
|
Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
|
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.
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
|
|
|
08-03-2015, 12:27 PM
|
#9
|
inveniam viam aut faciam
Join Date: Mar 2014
Location: Arvada, CO
Posts: 440
|
Quote:
Originally Posted by Gelbster
|
I was thinking the same thing, although I have no experience with the BMW PCV system. It would be nice to have an AOS like the motorsport version, but with a replaceable diaphragm. Viton would be perfect as it is unaffected by oil and fuel.
__________________
'03 S, manual, 18" Carrera wheels, PSM, PSE, Litronic, 996 Cluster, +
|
|
|
08-03-2015, 12:59 PM
|
#10
|
Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
|
Quote:
Originally Posted by Qmulus
I was thinking the same thing, although I have no experience with the BMW PCV system. It would be nice to have an AOS like the motorsport version, but with a replaceable diaphragm. Viton would be perfect as it is unaffected by oil and fuel.
|
Brad Roberts claims to make something like this
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
|
|
|
08-06-2015, 09:09 AM
|
#11
|
Rennzenn
Join Date: Feb 2005
Location: Virginia
Posts: 1,369
|
Quote:
Originally Posted by The Radium King
i can't speak for 'fro, but the aos vents three different locations - both heads and the case. that would mean a lot of hose re-routing and fabbing adaptors to replace the aos altogether. prolly the easier route would be to put the aftermarket aos between the stock unit and the intake as a backup.
|
That's exactly what I've done. I cut the connector end off the old AOS to give me a good end, then tapped and threaded in a brass hose fitting. Did the same on the intake side (cutting into a perfectly good 75mmTB intake gave me the willies). I had to plumb in a smaller T into the AOS line to accomodate the fuel vent line.
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.
__________________
Rennzenn
Jfro@rennzenn.com
|
|
|
08-06-2015, 03:36 PM
|
#12
|
Registered User
Join Date: May 2014
Location: S.California
Posts: 2,027
|
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
Last edited by Gelbster; 08-06-2015 at 03:41 PM.
|
|
|
08-08-2015, 11:36 AM
|
#13
|
Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
|
Quote:
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.
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
|
|
|
08-08-2015, 12:12 PM
|
#14
|
Registered User
Join Date: May 2014
Location: S.California
Posts: 2,027
|
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
|
|
|
Thread Tools |
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is On
|
|
|
All times are GMT -8. The time now is 10:32 PM.
| |