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Old 03-06-2006, 06:27 PM   #1
ktmbass85
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Default help with 2.5 sti block breather holes plugged?

i am doing a wrx hybrid engine swap..wrx heads/sti shortblock. someone told me i need to plug 2 breather holes on the sti short block. which holes? "pics" and how do i plug them?
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Old 03-06-2006, 08:35 PM   #2
gpatmac
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I'm not going to tell you what you should or shouldn't do like I'm an expert, but generally what I've seen is that folks cap the breather in the center of the block but still utilize the other breather for proper crankcase ventilation. As a matter of fact, I don't think it'd be very healthy to cap both of them.

In the pic, the arrow in the center is the one which folks cap and the arrow on the right is where you reuse your WRX or STi "Y". The bottom of the Y goes to the block, one of the arms of the Y goes to your PCV behind your intake manifold, and the other arm routes back into your turbo inlet pipe.
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Old 03-06-2006, 08:51 PM   #3
Crazykev
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Very good pic man! What would be used to plug the breather line?
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Old 03-06-2006, 09:00 PM   #4
jblaine
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Definitely do not cap them both.

And I don't recommend capping only one of them.

They're there for a reason.

"T" them together if you have to.
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Old 03-06-2006, 10:18 PM   #5
gpatmac
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When I initially capped it, I just used a rubber hose-type material which was closed on one end, and then I clamped it. That was the advice of one of the well-known and respected vendors on here. However, he never really explained why.

Right or wrong, I now have mine T'd like Jeff is talking about and running to a catchcan (along with the breathers on my heads.) If you look around this website, you'll see some really good ideas of how to manage your crankcase ventilation.
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Old 03-06-2006, 10:56 PM   #6
moorebl
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i love the looks of a fresh 2.5. t them off
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Old 03-06-2006, 11:15 PM   #7
TexRex2002
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the one in the middle is an air intake for the block. put a hose on it with a little pvc filter. make sure the filter is 6" or so above the top of the block with no "low spots" in the hose where oil can accumulate.
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Old 03-07-2006, 04:37 PM   #8
Crazykev
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Huh, is it OK to just T them together?
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