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Old 11-20-2003, 11:03 PM   #1
StewedSquirrel
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Member#: 48509
Join Date: Nov 2003
Vehicle:
1998 Impreza OBS
Red/Grey

Default Tubes on the bottom of airbox in EJ22

I'm just trying to learn about my engine more. I took apart the intake system. I removed the filter and the MAF and attempted to remove the airbox attached to the intake itself, but it has a few hoses attached to it, one in the front corner and one off the "arm" on the back. There is also a 2-to-1 junction strapped to the bottom of the box.

Are these vacuum hoses? Or what are they? What do they do and what is the effect if they're disconnected from the airbox (or clogged/closed)?

Just curious.

Thanks,
Eric
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Old 11-21-2003, 12:53 AM   #2
koolaid
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1997 Impreza Outback
Red

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Alright, I just made an intake.. So i think i know these hoses. The 2 -> 1 is a splitter, its for the valve breathers, the big and one next to it are for the crank case (i believe). If the big one is disconneted the car will not run. Yeah, any further Questions, dont be afraid to e-mail me...

Best regards,
Ben
phs_champs@hotmail.com
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Old 11-21-2003, 02:24 AM   #3
StewedSquirrel
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that's a little less technical than I was hoping... and the (I believe) part doesn't inspire confidence. Anyone else want to chime in?

There appear to be 3 of them, one to each of the last 3 cylinders, but I can't see a 4th one, which made me wonder...

They smell like oil and were damp with oil when I disconnected them, but they don't flow oil, since they empty into the airbox.

Anyway, I've done a little investigating and I think that I will be able to leave all of those connected to the airbox.

I want to shift it back toward the firewall about 4 inches (all the way back) and tip it upward about 30 degrees, so that there is a flexible hose connecting it to the actual intake manifold. From that position, I will be able to connect the MAF directly to the input on the box and then route a stretch of 3" ABS pipe with two 90" turns and a cone-shaped hi-flow filter resting slightly above and to the passenger side of the throttle assembly.

I'll have to investigate how to insulate the intake from the hot metal just below it, but that will only be an issue at idle. At speed, the scoop, directly above it, will provide an ample supply of cold air.

The only trick beyond that will be to fashion an airguide that attaches to the scoop itself and funnels the air down into the intake. Ideally, I'd like to make something nearly sealed, with some rubber weather stripping around it that closes tight when the hood is closed. Practically, I'll be happy if I have less than 1" gap all around, since when it counts, at speed, the pressure will push cold air out into the engine, rather than drawing hot air in from the engine.

I designed this very carefully to make sure that I am able to restore it to stock if I have any problems, such as issues with MAF airflow.

I'll let you know how it goes. I purchased some 3" ABS plumbing today, but that's a 3" inner diameter and 3 1/2" outer diameter. The pipes in the engine are 3" inner diameter and 3 1/16" outer diameter, so the fittings I have don't work on the places I need to attach them. Besides, I don't have the high-flow filter in there yet. :-D

Oh yeah, for the idle control vacuum hose, I got a 1" screw threaded PVC nipple. I will drill into one of the 90" elbows, trim off the bottom half of the threading, screw it into the hole and use some ABS cement to secure it. That's considered good enough for sewage, I hope it's good enough for cold air. :-)

Eric
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Old 11-21-2003, 11:04 AM   #4
koolaid
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Quote:
Oh yeah, for the idle control vacuum hose, I got a 1" screw threaded PVC nipple. I will drill into one of the 90" elbows, trim off the bottom half of the threading, screw it into the hole and use some ABS cement to secure it. That's considered good enough for sewage, I hope it's good enough for cold air. :-)
I was wondering what this big hose that was a PITFA was for..
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Old 11-21-2003, 11:14 AM   #5
Mapplex
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1997 Impreza L
hunter green

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I think one of them might be a drain hose for any water that might make its way into the air box.
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Old 11-21-2003, 11:57 AM   #6
koolaid
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No, there is technically no way for water to get there.. there are breathers.. thats it, and the idle air control
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