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10-05-2015, 03:39 PM | #1 |
Scooby Newbie
Member#: 149247
Join Date: May 2007
Chapter/Region:
MWSOC
Location: Northern Michigan
Vehicle:2018 STI WRB |
What are you using to cap off crankcase breather in your hybrid build?
Hey guys, title says it. Looking for what people are using to cap off the secondary breather on the ej257 block for hybrid builds. Are you using rubber caps and a hose clamp? Freeze plugs? Tapping it for a gallery plug? Pulling it out and welding it? Sticking a small animal in it?
I've searched a lot and haven't found much on this. Plenty of arguments on if it should be capped, or how to route it into the existing pcv system or valve covers, but not much on the method folks are using to actually cap/block it off. I've seen others asking this question without a clear answer as well. Hopefully this thread can help them too. To be clear, this is not a discussion on whether or not this is the proper way to do the build, there are plenty of other threads on that. Please take those thoughts over to one of those. Thanks in advance!
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10-05-2015, 03:59 PM | #2 |
Scooby Newbie
Member#: 11216
Join Date: Oct 2001
Location: Denver CO
Vehicle:1991 SS 1998 BG 1996 BD |
I have done most of the options. Freeze plug with correct diameter (sucks it you tap it in too far)...or tap it and screw in a bolt (viable with fully disassembled case halves)...or install a rubber cap with a hose clamp on the fitting (quick and easy, but cap will crack eventually).
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10-05-2015, 05:14 PM | #3 |
Scooby Newbie
Member#: 149247
Join Date: May 2007
Chapter/Region:
MWSOC
Location: Northern Michigan
Vehicle:2018 STI WRB |
Interesting. I would like to keep the pipe intact if possible as I may swap over to STI heads eventually and do a full swap, so the rubber cap (or something similar) is the most appealing. What's a guestimation on "eventually" for it breaking down?
The block is also assembled so I don't really want to split it again either if at all possible. Don't want to ghetto it, but also looking for the path of least resistance. |
10-05-2015, 05:16 PM | #4 | |
Scooby Specialist
Member#: 425346
Join Date: Jul 2015
Chapter/Region:
South East
Location: 127.0.0.1
Vehicle:2003 WRX Caucasian |
Quote:
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10-05-2015, 09:38 PM | #5 |
Scooby Newbie
Member#: 385446
Join Date: Mar 2014
Chapter/Region:
BAIC
Location: Grass Valley
Vehicle:2004 WRX JBP |
My builder told me not to cap it as it would create excess crankcase pressure.
I tee'd it to my air/oil separator. |
10-06-2015, 08:23 AM | #6 |
Scooby Newbie
Member#: 149247
Join Date: May 2007
Chapter/Region:
MWSOC
Location: Northern Michigan
Vehicle:2018 STI WRB |
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10-06-2015, 08:29 AM | #7 | |
Scooby Newbie
Member#: 149247
Join Date: May 2007
Chapter/Region:
MWSOC
Location: Northern Michigan
Vehicle:2018 STI WRB |
Quote:
Also curious if you are happy with it, what method you used for your build. Thicker gaskets? Machined heads? Stock heads with regular sti gasket? I have had my combustion chambers matched (just got back from the machine shop) and will be using oem sti gaskets. Curious how other similar builds are faring when capped. |
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10-06-2015, 09:58 AM | #8 |
Scooby Specialist
Member#: 241243
Join Date: Mar 2010
Chapter/Region:
Tri-State
Location: north new jersey
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Clamp a short piece of hose with a bolt. Those rubber caps always seem to crack and leak after a short time.
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10-12-2015, 09:57 PM | #9 |
Scooby Newbie
Member#: 303380
Join Date: Dec 2011
Location: eastern ky
Vehicle:2004 wrx hybrid silver |
^ thats what ive used for a while now lol still holding strong.
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05-20-2020, 10:16 AM | #10 |
Scooby Newbie
Member#: 322745
Join Date: Jun 2012
Chapter/Region:
Tri-State
Location: Philadelphia, PA
Vehicle:2004 IAG hybrid WRX Aspen White |
I jammed a medium-sized gerbil into mine and have had no issues.
All jokes aside, this thread hit the spot so I'm bumping for continued relevance. |
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