|
|
|
|
Thread Tools | Display Modes |
|
10-22-2022, 12:25 AM | #1 |
Scooby Newbie
Member#: 121212
Join Date: Jul 2006
Chapter/Region:
SWIC
Vehicle:2007 Sti Limited Urban Gray Metallic |
Rerouting the crankcase/valve cover venting system, need help
6. The OEM PCV and crankcase venting system seems way over complicated. Why do they put 2 vent ports on each valve cover and right next to each other? I see the crankcase vent and it then goes UP and over and then back down to the valve cover vents. Why? Why not just run straight lines to the valve covers? Again seems overly complicated to me and make it more complicated than it needs to be, unless there is some technical reason they do that. I will be installing my own AOS and just want to run the rear vents on each valve cover and the crankcase vent to the input of the AOS and cap off those other vents in the valve covers. Can I do that? And what about the PCV valve? Where/why is that there? How is where it's drawing from different from that large crankcase vent? I must be missing something here.
|
10-22-2022, 08:09 AM | #2 |
Scooby Specialist
Member#: 459692
Join Date: Dec 2016
Chapter/Region:
South East
Location: Hampton Roads Va
Vehicle:2019 WRX STI silica black |
IIR one of the ports on each valve cover has a simple oil baffle and the other is open to the top of the head. The open port is to equalize pressure between the two valve covers (not sure how important that is). You should be able to determine which is which by the hose routing. Maybe someone with a set of valve covers off their motor can elaborate. There's some really smart members here with their own theories on how the PCV system should be routed. If you're not in a rush you can wait for them to chime in.
|
10-22-2022, 08:12 AM | #3 |
Scooby Specialist
Member#: 515308
Join Date: Jun 2020
|
Speed density or MAF? If SD run that shot through a large catch can and then overboard.
|
10-22-2022, 03:47 PM | #4 | |
Scooby Newbie
Member#: 121212
Join Date: Jul 2006
Chapter/Region:
SWIC
Vehicle:2007 Sti Limited Urban Gray Metallic |
Quote:
Thank you. |
|
10-22-2022, 09:56 AM | #5 |
Scooby Specialist
Member#: 519868
Join Date: Nov 2020
Location: Chicago
Vehicle:2010 Impreza WRX Satin White Pearl |
This video by Flatirons Tuning explains it the best with visuals:
https://youtu.be/mO9mxDUDUDc |
10-22-2022, 04:45 PM | #6 | |
Scooby Newbie
Member#: 121212
Join Date: Jul 2006
Chapter/Region:
SWIC
Vehicle:2007 Sti Limited Urban Gray Metallic |
Quote:
Yes, I had viewed that before, but watched it again. And I"m glad I did because at the end it suggested this video: Which was amazingly helpful. Really helped explain the whole situation. Those guys at Flat Irons are really good. Thank you your reply, indirectly it answered my questions. ;-) |
|
10-22-2022, 11:27 PM | #7 | |
Scooby Specialist
Member#: 519868
Join Date: Nov 2020
Location: Chicago
Vehicle:2010 Impreza WRX Satin White Pearl |
Quote:
Glad I could help though Btw my TMIC always has a light coating of oil, most of it collecting around the gasket on the turbo outlet. Perhaps something isn't exactly right or could be improved with your setup. Last edited by a5m; 10-22-2022 at 11:33 PM. |
|
10-23-2022, 12:47 AM | #8 |
Scooby Newbie
Member#: 121212
Join Date: Jul 2006
Chapter/Region:
SWIC
Vehicle:2007 Sti Limited Urban Gray Metallic |
Well I have a beast of an AOS. It's for a diesel engine. I'm going to try it. It has 1" inputs. :-)
|
10-22-2022, 03:57 PM | #9 |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
Don't block any of the ports.
The large ones are the crankcase balance ports and the smaller ones are PCV. The PCV Valve is either on the back side of the manifold, or in the plastic adapter on the rear breather port tee (depending on what year engine). Some AOS units (like ours) remove the PCV valve, some do not. |
10-22-2022, 06:04 PM | #10 | |
Scooby Newbie
Member#: 121212
Join Date: Jul 2006
Chapter/Region:
SWIC
Vehicle:2007 Sti Limited Urban Gray Metallic |
Quote:
|
|
10-22-2022, 07:32 PM | #11 | |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
Quote:
I would recommend a compression and leak-down test before going any further. |
|
10-22-2022, 10:27 PM | #12 | |
Scooby Newbie
Member#: 121212
Join Date: Jul 2006
Chapter/Region:
SWIC
Vehicle:2007 Sti Limited Urban Gray Metallic |
Quote:
|
|
10-22-2022, 03:58 PM | #13 |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
delete double post
|
Thread Tools | |
Display Modes | |
|
|