IAG Performance Air Oil Separator Subaru 08-014 WRX/ 08-15 STI
Part #: IAG-ENG-7151RD (Wrinkle RED)
Condition: Brand New
Application: 2008-2014 Subaru WRX
2008-2015 Subaru STI
Breather
Port Rotation For Install Ease
Dual Breather Port
Greater Pressure Stream Oil Separation
Notice
the dual breather port? At first glance you might think this is excessive,
however our reasoning is grounded in simple physics. As air and particles of oil
enter into the AOS, the largest particles of oil will collect on the inner
surface of the can and drain to the bottom, but the smallest particles will
remain suspended in the pressurized stream.
As
the air makes its way through the multi-stage baffle system, gravity pulls oil
from the air. By increasing the overall volume of the breather opening on the
top of the AOS, we have drastically decreased the exit velocity of the crankcase
vent (CCV) stream. The slower velocity leads to greater oil separation from the
pressure stream. A total of 9 mounting holes give the breathing port a full 180°
of rotation. On the bottom, a thick Viton o-ring seals the can. Every o-ring in
our AOS is formed from Viton which offers superior temperature and chemical
resistance.
AOS
BODY
Large
Billet Aluminum Design
Approximate 1 Liter Holding Capacity
Integrated 3 Port Billet Hose Barbs
Aluminum Body is powder coated in Red, Black, Dark Silver. Also available in
World Rally Blue (automotive paint).
The side of the AOS features 3 port billet hose barbs. There are NO plastic
fittings that require thread tape to seal.
The
Subaru EJ engine has 3 ports that vent crank pressure: one on each cylinder head
and another on the top of the block. Each engine vent port receives its own
connection to the AOS. By giving each engine port its own entrance to the AOS we
have allowed for more effective and faster excavation of crankcase pressure.
Additionally this reduces overall system pressure. With a 4" OD and
5.75" height, the AOS has an approximate 1 liter of holding capacity. The
larger the AOS, the more power you can safely make without having to worry about
the AOS overfilling.
AOS
BOTTOM
Unique
Baffling Controls Crankcase Pressure
Returns Oil To The Engine
No Maintenance or Manual Draining Required
The bottom of the AOS is shaped like a snail, redirecting positive crank
pressure into the same swirl pattern produced by the 3 side ports. Allowing
maximum oil drainage while separating oil from the air in all the venting ports.
Why
not use a catch can? Unmodified Subaru's may require catch can draining as often
as every few weeks. Heavily modified race cars may be as often as every race.
Our
AOS collects oil and actively drains the oil to the crankcase. The drain port is
under the same crankcase pressure as the other ports that are on the side of the
AOS. Under normal, off boost driving the weight of the collected oil will easily
overcome the pressure in the drain line. However, under heavy boost (especially
on higher powered engines) the crank pressure will push back up the drain with
the same air/oil mixture that is seen on the side ports. The unique snail design
allows the system to breath without disturbing the swirl pattern.
AOS
DRAIN PORT
The AOS drain port is able to be rotated for ease of installation.
AOS
FITTINGS
All fittings supplied with the AOS are anodized aluminum and feature Viton
sealed ORB fittings.
AOS
HOSE
The supplied coolant hose is built to SAE 20R3 standards. It will withstand
coolant temperatures of +257°F. The oil vapor hose is designed to withstand oil
and fuel vapors, exceeding SAE J30R7 standards.
AOS
COOLANT
Heated By
Engine Coolant
Reduces Moisture & Oil Mixing
The
back plate of the AOS features a unique coolant routing system that heats the
entire AOS to the same temperature of the engine. This maximizes the evaporation
of any water collecting inside of the can. The hotter the AOS, the less water
will collect inside and mix with the oil.
AOS
MOUNTING
Multi-point Adjustable Mounting Bracket
The center bracket allows for adjustable mounting. If your engine bay changes,
you can easily change how and where you mount the AOS. A single laser cut
mounting bracket is included that fits nearly all applications and
configurations.
A
laser cut harness relocation bracket is also included. The bracket allows the
engine harness connector to be moved forward for additional clearance.
AOS
IN THE BOX
Ready To
Install
Hardware, Lines & Fittings Included
Your AOS
will arrive to you completely assembled and ready for immediate installation.
However, the entire unit can be broken down for cleaning. With a single allen
wrench, you can remove 4 bolts and the AOS easily separates into individual
pieces.
FAQ:
Q: Why
do I need an AOS?
A:
In stock configuration, the un-baffled crank case pressure is re-circulated back
into the intake stream. This can be harmful for two reasons:
1)
Oil vapor mixed with the intake air effectively lowers the overall octane rating
of your fuel. The more oil vapor that is sucked back into the engine, the more
likely you are to experience engine knock (also referred to as detonation) that
can destroy an engine.
2)
Oil vapors cause oil & carbon build up over time. The intercooler, intake
manifold & intake valves suffer the worst. This oil vapor can create air
turbulence that leads to various running issues.
Q: What
are the factors that cause oil in crank case vent system (CCVS)?
A:
There are a variety of factors that determine how much oil will be in the CCVS.
The most significant of these factors are: boost pressure, piston to cylinder
wall clearance and oil viscosity. Smaller factors include: ambient temperature,
engine temperature, piston ring condition and valve guide condition.
Q: Are
there any risks to using the IAG billet AOS?
A:
If your AOS is properly installed, there are not any risks.
Q: What's
the difference between a catch can & the IAG AOS?
A:
Catch cans are a air/oil separator that does not actively drain the collected
oil back into the engine. Most catch cans require you to drain the contents out
manually. While acceptable on some engines that produce little oil in the CCVS,
the Subaru EJ engine is not this type of engine. By nature, a turbocharged boxer
engine will produce significantly more oil in the CCVS than other engines of
similar displacement.
*Please
note that IAG recommends the STREET SERIES AOS for ALL cars running E85 or
high-ethanol fuel blends. When tuning E85, ethanol vapors tend to stay in the
crankcase, which ultimately results in the oil becoming diluted and requiring
extremely frequent oil changes. Pulling vacuum via the Street Series
recirculating design to the inlet is ideal for ethanol tuned vehicles, and will
allow the ethanol to be removed from the crankcase and burnt off as part of the
combustion process.