2.5 Crankcase ventilation? - Subaru WRX Forum
 
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post #1 of 6 Old 09-02-2006, 01:25 PM Thread Starter
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2.5 Crankcase ventilation?

..in the middle of a swap and seems there is two breathers on the new block and only one on the 2 liter. Is this true and if so how do I deal with the extra breather. Can we get away with one and plug the other? I hope this is not stupid question. d'

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post #2 of 6 Old 09-02-2006, 04:21 PM
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I noticed the same thing.. I honestly can't remember what I did, but I can look at mine as soon as I go home, my block is in my foyer.. I believe I only put the breather bung on the vent located on the passenger side..

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post #3 of 6 Old 09-02-2006, 09:31 PM Thread Starter
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Quote:
Originally Posted by LiL Shoaf
I noticed the same thing.. I honestly can't remember what I did, but I can look at mine as soon as I go home, my block is in my foyer.. I believe I only put the breather bung on the vent located on the passenger side..
That's what we did...just plugged it and now the swap is complete and up and running-thank the Subie gods it started on the first time easily. ONLY issue:surging at idle rather rapidly and the idle is over 1050 rpm? Got any ideas Shoafster'? Dani'

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post #4 of 6 Old 09-05-2006, 06:34 PM
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What ECU are you running? Did you adjust your cold start and post start adjustments?? does your ECU auto-tune? If so what is your smoothing set at??

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post #5 of 6 Old 10-09-2006, 03:56 PM
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Quote:
Originally Posted by LiL Shoaf
I noticed the same thing.. I honestly can't remember what I did, but I can look at mine as soon as I go home, my block is in my foyer.. I believe I only put the breather bung on the vent located on the passenger side..

Sorry I am a month behind on this topic, but I am pretty positive that you can run like this without any issues on a stock STI short-block. With mine I tried to run both through a Catch-can and back into the inlet pipe, but since I am running Forged pistons, this setup did not allow for enough of the pressure to evacuate the crank, and caused excessive oil burn due to blow-by. I wound up running them both to a catch-can that vents to atmosphere, and then plugged the hole in the inlet pipe. This has worked, and oil burn is down to a minimum!

Let me know if I can help.
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post #6 of 6 Old 10-11-2006, 07:26 PM
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Humm.. Never thought about that, as I'm also on Forgies.. (CP Pistons) and I have (what I consider excessive) oil consumption due to blow out.. I lose about a quart every 1500 miles. Everyone I have ever talked to about it has never suggested opening up both breathers..

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