AOS Failure: what breaks first?

[The Radium King]

does the crankcase need to be under vacuum or just vented?

[maytag]

Originally Posted by The Radium King

does the crankcase need to be under vacuum or just vented?

My understanding of this was that it's still under vacuum. That's what I got from the installation instructions.
I think the vacuum is important.

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[Gilles]

Originally Posted by The Radium King

does the crankcase need to be under vacuum or just vented?

I believe the design of the low friction piston rings requires the crankcase vacuum to seal properly.
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[maytag]

Can anyone tell me what size (diameter) hose connects the Throttle-Body to the AOS?

I'm going to experiment with a small catch-can plumbed-in there, to catch any/all oil that gets past the AOS, give it a place to condense the vapors and then catch & contain what remains. My hope is that I can end the small smoke-bombs that plague me at the track. Despite how common they are on Boxsters, I keep getting black-flagged for them, and I need them to go away.

It seems to me that as long as this added catch-can & associated connections remain air-tight, then the added volume to the system is probably unimportant. (any disagreements?)

Any reasons you can think of that this won't work?

[Gilles]

Originally Posted by maytag

Can anyone tell me what size (diameter) hose connects the Throttle-Body to the AOS?

Maytag, the AOS has two main accordion hoses, one connects to the T tube where the throttle body attaches to, and the other one goes to a breather valve on top of the block behind the driver seat (4-6 bank)

I replaced them once on my 987 and the by the type of the connectors I don't thing that would be very easy to do unless you modify the way the hoses connect with the entire AOS breather system.

Out of curiosity, why don't you just but two new accordion hoses and replace the old ones? You would be back in business in no time (IMHO)..
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[maytag]

Originally Posted by Gilles

Out of curiosity, why don't you just but two new accordion hoses and replace the old ones? You would be back in business in no time (IMHO)..
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Thanks Gilles. I don't think this accomplishes anything for me. I have no reason to suspect my "accordion hoses" are bad, in any way.

What I'm trying to do is eliminate the smoke-bombs which plague Boxster owners at the track, by installing a catch-can after the AOS and before the TB. This would (I'm postulating here) catch whatever amount of liquid oil momentarily overwhelms the AOS.