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Old 05-20-2009, 07:35 PM   #1
RallySport Direct
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Default How To: Prova Air Oil Separator

Prova Air oil Separator is the fastest, most simple, and the cleanest installed unit on the market. It captures the vaporized oil coming out of the heads , allows the fumes to run through the filler neck where the oil can condense back to liquid form and drop back into the motor. This will keep the oil in your motor, instead of having it get burned. This will allow you to keep your motor cleaner, and running better, along with help prolong the life of your motor. There is a reason why many high end sports cars include air oil separators, as it helps keep the motors clean and running at optimal level.

These units can be used on Turbo and NA Subaru motors.

The total install time is about 5-10 min, and requires these things.
1) Prova Air Oil Separator
2) Razor Blade
3) Pliers or something to cut zip ties


These are all the Contents of the Prova Air/Oil Separator kit. As you can see it comes with Hose, Separator, Zip Ties, Instructions, and Plastic T's.


We did the install on a 2008 STi. However all turbo Imprezas should be 99% the same.



Start with taking off the oil cap from the filler neck.


Get the Air oil separator. You can see that its a 2 piece design, having the center piece screw into the filler neck securing the outer piece of separator in place.


Tighten down the center piece hand tight, and then reinstall the oil cap.


Now move over to the PCV hose that comes from the cross over pipe on the intercooler. Pull off the hose from the metal pipe.


Now follow that hose, and you will see where it attaches to the turbo inlet hose. Pull it off from there, however be careful not to break the nipple off the inlet.


The Kit comes with 2 different size hoses. The larger ID hose is for the Turbo inlet side, for the fumes coming out of the separator. The smaller ID is from the metal pipe on top of the intercooler.


Now get the supplied smaller inside diameter hose that comes with the Prova Separator and attach it to the metal pipe that runs across the intercooler.
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Old 05-20-2009, 07:35 PM   #2
RallySport Direct
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Once attached to the hard pipe, run it over the the separator.


The hose supplied is about 2X as long as you need, so get the razor and cut it to the appropriate length.


Once cut to proper length attach it to one of the nipples on the separator. The way this unit is designed, it does not matter what one is in and what one is out. Making this a very easy to use unit.


Now Get the larger hose and install it onto the turbo inlet side.


Now run it over to the separator, cut to proper length, and attach it to the separator.


After all the hoses are attached, make sure that the hoses have no kinks. If everything looks proper get the supplied zip ties and secure the hoses to keep them from moving around and to make it a clean looking install.


After you are all done. This is what you will have left over. The left over fittings are to be used if you had a NA Subaru. You will notice in the image the pre-bent hose, that is the OEM piece that you pulled off that ran from the Metal cross over pipe on top of the intercooler into the turbo inlet.



Now give it a couple days and you will start noticing that the car will start running better as it will be burning off the remaining oil that is in the intercooler, turbo inlet, and inside the intake manifold.


If you guys/gals have any questions do not hesitate to ask.

Kirill
RallySportDirect.com
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Old 05-23-2009, 04:50 PM   #3
BeBop86
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Are there any valves or anything special to the air/oil seperator that connects to the filler neck? Or is it basically an air inlet and outlet that drains to the filler neck?
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Old 05-23-2009, 05:34 PM   #4
Hondaslayer
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Aluminum or Plastic?
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Old 05-23-2009, 08:04 PM   #5
shemoves
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what prevents the seperator from simply reinjesting the 'cycled' oil vapor or the oil that spurts up from the pan?
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Old 05-23-2009, 10:02 PM   #6
Hondaslayer
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Quote:
Originally Posted by shemoves View Post
what prevents the seperator from simply reinjesting the 'cycled' oil vapor or the oil that spurts up from the pan?


Ever look under the hood of your car?
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Old 05-26-2009, 12:22 PM   #7
RallySport Direct
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Quote:
Originally Posted by BeBop86 View Post
Are there any valves or anything special to the air/oil seperator that connects to the filler neck? Or is it basically an air inlet and outlet that drains to the filler neck?
No check valves in it. A inlet and a outlet with a chamber to allow the oil to drain.
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Old 05-26-2009, 12:22 PM   #8
RallySport Direct
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Quote:
Originally Posted by Hondaslayer View Post
Aluminum or Plastic?
Aluminum.
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Old 05-30-2009, 07:55 PM   #9
moosecakes
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Isnt that thing just dumping contaminated oil back into the oil.....? Mabey im missing something.... Nice write up though
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Old 05-30-2009, 08:28 PM   #10
subaru_sti293
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Oil recycle.
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Old 05-31-2009, 06:21 PM   #11
ciper
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Very nice writeup. I applaud your dedication to detail.
Very nice machined piece of aluminum.

However I think the bang for the buck ratio on this item is extremely bad.
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Old 06-01-2009, 05:07 PM   #12
grex07
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yes too pricey.
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Old 06-01-2009, 05:12 PM   #13
RallySport Direct
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If you guys have any concerns about his product fitting please post in this tread.
If you have any issues with pricing, please PM us or email Prova Japan. This thread is about the product installation not about the price. If you dont agree with pricing please keep it in the PM's and not junk up this thread.

Thanks
Kirill
RallySportDirect.com
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Old 06-02-2009, 03:28 AM   #14
IIdiceII
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nice kit...just wish it came with an oil cap instead of using the ugly yellow stocker to cover up the prova goodness.
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Old 06-02-2009, 12:47 PM   #15
RallySport Direct
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Quote:
Originally Posted by IIdiceII View Post
nice kit...just wish it came with an oil cap instead of using the ugly yellow stocker to cover up the prova goodness.
The nice thing is sense you can use the stock cap with this, it allows you to use any other OEM replacement cap and it will work
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Old 06-02-2009, 01:03 PM   #16
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wow MUCH MUCH MUCH MUCH MUCHHHHH simpler install than the crawford aos... that one was a pain and i had to take off cruise control for it too.
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Old 07-11-2009, 01:17 AM   #17
englishguy3012
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might have to get one of these soon
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Old 07-14-2009, 02:09 AM   #18
douthinkicare
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I have been looking at this for a bit now and it's simple stupid. Which i like, But i have worries about a possibility of the pressure introduced into the crank case useing this system. I am a novice do it yourselfer with little education in the ways of crank case venolation. Any input is much appretiated.
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Old 07-14-2009, 12:15 PM   #19
RallySport Direct
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There will actually be vacuum in the PCV system, do to the negative pressure in the intake system pre turbo.
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Old 07-14-2009, 11:36 PM   #20
speedmonkey
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Thumbs up

These are a high quality piece from Prova as usual. Machined from a solid piece of Aluminum. I have been running one for over 15K and it has been great! No problems and as usual my UOA's have been showing that everything is running very healthy. Enjoy!
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Old 07-20-2009, 06:29 PM   #21
orwrx
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Is there two hose with have oil vapor out? That's why ppl are running dual catch oil setup? This is only route one hose, how about the other one that route back to the inlet?
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Old 07-20-2009, 06:35 PM   #22
RallySport Direct
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This only attaches to the head system, the Crank case system is left to work like stock.
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Old 07-22-2009, 03:24 PM   #23
JDM Junkyard
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how much does this cost?
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Old 07-22-2009, 03:51 PM   #24
RallySport Direct
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Pricing for these units can be seen on our site.
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Old 07-22-2009, 07:34 PM   #25
LOBO1732
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Could you connet fittings for steel braided lines
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