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Rasta, you suck, and you owe me $100.
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wombat  



Joined: 07 Jun 2008
Posts: 422
Location: Melbourne, Australia

PostPosted: Sat Sep 06, 2008 3:43 pm    Post subject: Reply with quote

Ozzie wrote:
To my thinking.
The line from the breather is about 20mm and connected on ROW cars to the join in the main air induction.
Without a restrictor this will put the sump into a high negative pressure.
Open the oil fill cap and you will have a massive vacuum leak.

Oil vapour has a greater chance to be drawn into the induction and burnt.
At high revs you will be leaving a smoke trail.

On US cars the air box will likely have oil in it, dripping everywhere.


Thanks for this answer ozzie it just explained a whole lot of things to me. My car has been leaving a small trail of smoke under high power checked compression and all was ok so I was a little confused as to why this was happening. I had also wondered if it was running a little rich so was about to check this. It also has what I considered to be an abnormal amount of oil in the box but given your answer and noticing that the PO had replaced the line with a non standard without a restrictor I think this may be my issue.
Thanks again.
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1977 924 2.0 Auto
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Brockoli  



Joined: 06 Feb 2007
Posts: 621
Location: Edmonton, Alberta, Canada

PostPosted: Wed Sep 24, 2008 2:08 pm    Post subject: Oil in the air box Reply with quote

so, I am very curious if this works. I have an extreme amount of oil dripping out of my air box. The filter was soaked a 1/4 of the way up. And I have a slick on my drive way. I dont want to think about the oil that got into the AAV, CSV, suspension bushings.

So is it worth it, I need a solution fast, buying $18 air filters is a waste of cash money!!!!
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'80 924 M471,Wideband O2, Full coilover susp,23/19 sways,Bilstiens,KLA Strut Brace,Roll Bar,Test Pipe,BBS RS, Willwood BBK

25% of a '87 944 Chumpcar http://straightpipe.ca/forums/showthread.php?t=2454

'79 924 Sebring Edition(Sitting)
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Ozzie  



Joined: 12 Mar 2005
Posts: 4447
Location: Townsville, Qld. Australia

PostPosted: Wed Sep 24, 2008 2:13 pm    Post subject: Reply with quote

I dont have any oil in my air box.
My car originally had the connection in the join but I rerouted and connected to the air box.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance
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Chrenan  



Joined: 15 Jan 2003
Posts: 3899
Location: Canada

PostPosted: Thu Sep 25, 2008 1:02 am    Post subject: Reply with quote

Yes, works well, no oil in the intake tract, I just drain the catch can whenever I am under the car, which is usually once a month to check stuff out. Not a whole lot comes out of the can. If you let it sit for a while, you can actually see the moisture seperate from the oil. Pretty neat, it is mostly moisture that comes out.
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1987 951 - M193 Version for Japan
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Chrenan  



Joined: 15 Jan 2003
Posts: 3899
Location: Canada

PostPosted: Thu Sep 25, 2008 1:03 am    Post subject: Reply with quote

Brock, by the way, I happen to have a spare one of these catch cans. The fittings on it are slightly smaller than those on the 924, so you would need 2 hose reducers to make it work, but I'm sure it could...
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ideola  



Joined: 01 Oct 2004
Posts: 15507
Location: Woodstock IL

PostPosted: Thu Sep 25, 2008 1:23 am    Post subject: Reply with quote

Can you post a photo of the catch can itself? Just curious.

On a related note, I've posted this elsewhere, but after reading the articles on Autospeed about air-oil separators...
Pots and Cans
DIY: An Oil/Air Separator
Building An(other) Oil/Air Separator

...I read somewhere that PVC was a good oil- and petroleum-resistant plastic. I'm wondering if you could inexpensively build an air oil separator like the one in the first article above, but make it out of PVC instead of welding one from metal. The stock unit is plastic. Why not PVC and then paint it??? Any comments???
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75 Fiat X1/9 | 80 US 928 | 80 US 931 '941' | 78 D-Prod Replica | 78 Poli-Form
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Chrenan  



Joined: 15 Jan 2003
Posts: 3899
Location: Canada

PostPosted: Thu Sep 25, 2008 1:36 am    Post subject: Reply with quote

ideola wrote:
Can you post a photo of the catch can itself? Just curious.


There is a picture and a cutaway on page one of this thread. I can take a picture of the installation, but it wouldn't show much, it is pretty much tucked away hidden between the air box and the fuel filter...
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ideola  



Joined: 01 Oct 2004
Posts: 15507
Location: Woodstock IL

PostPosted: Thu Sep 25, 2008 1:51 am    Post subject: Reply with quote

Sorry, misunderstood, I was thinking there was a separate catch can from the separator.
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75 Fiat X1/9 | 80 US 928 | 80 US 931 '941' | 78 D-Prod Replica | 78 Poli-Form
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Brockoli  



Joined: 06 Feb 2007
Posts: 621
Location: Edmonton, Alberta, Canada

PostPosted: Thu Sep 25, 2008 5:53 am    Post subject: Reply with quote

sweet, how much do you want for it, I can live with modifying it to work. We need to get together to show off our cars too, as I havent got a ride in 951 and you havent got a ride in the sebring since I re did the suspension.
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'80 924 M471,Wideband O2, Full coilover susp,23/19 sways,Bilstiens,KLA Strut Brace,Roll Bar,Test Pipe,BBS RS, Willwood BBK

25% of a '87 944 Chumpcar http://straightpipe.ca/forums/showthread.php?t=2454

'79 924 Sebring Edition(Sitting)
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