View Full Version : B6/B7 S4 Oil Catch Can

08-27-2011, 10:34 PM
I installed a closed loop oil catch can system on my S4 and thought I would share my setup and how I went about installing it.

2. FUEL or PCV HOSE 11/16”ID x 2ft
3. FUEL or PCV HOSE 1/2”ID x 4ft
4. PCV ELBOW 90° x 11/16”
5. BARB REDUCER FITTINGS 11/16” to 1/2” x2
6. CRIMP CLAMP Part# N10201801 for 1/2” Hose x4
7. CRIMP CLAMP Part# N90411901 for 11/16” Hose x3
8. WORM HOSE CLAMPS [20mm/3/4” max. clamping range] x4
9. YAMAHA CORD BANDS Part# 1186674 or Zip Ties x3
10. POLY TUBING 1/2”OD x 1ft
11. AIR FILTER FOAM [thickness of 2-3”]
13. BRASS PIPE PLUG 1/8” x2
14. VACUUM PLUG 3/8”
Total Cost ~$65-80

https://www.4shared.com/img/niyJRmW-ei/s25/15d0b27e430/OCC_parts (https://www.4shared.com/photo/niyJRmW-ei/OCC_parts.html)

I chose the Greddy/Megan style OCC because it fits and flows with the engine bay design and its the most maintenance friendly. It can be stripped right down for easy cleaning and rebuilding, others are one piece and most are not baffled. Also the round design that are commonly found do not appeal to me as the S4 engine bay has a lot of "squareness". You can find this OCC on eBay for around +/-$30, the knockoffs are the same as the Greddy/Megan can but without the laser etching and absurd ~$130 price tag.

https://www.4shared.com/img/BRUDfZELei/s25/15d0b25adc8/goct-red_dpt (https://www.4shared.com/photo/BRUDfZELei/goct-red_dpt.html)

Setting up the OCC
—Remove OCC top and level tube, arrange brass plugs and drain fitting as shown, then thoroughly clean can afterwards.

Reason for this is solely for fitting purposes, I later ran a hose w/ drain plug from the drain fitting to underneath the car for ease of emptying the can.

https://www.4shared.com/img/R4wyrDDica/s25/15d0b255008/182-8219_IMG (https://www.4shared.com/photo/R4wyrDDica/182-8219_IMG.html)

The Baffle
The idea of the baffle is to neutralize and filter as much of the raging oily liquid vapors so they collect to the bottom of the OCC and not continue to the intake manifold. I installed this dual filter system thats been effective and also is easily serviceable.

—Rough cut Poly Tubing and install in the desired inlet side fitting using a light coat of high-temp silicone.
—Cut foam filter to fit snuggly in OCC.

https://www.4shared.com/img/blHI0daXca/s25/15d0b255bc0/182-8221_IMG (https://www.4shared.com/photo/blHI0daXca/182-8221_IMG.html)

—Cut a slice in the foam filter to allow the poly tube to pass through. The tube should protrude 1" out of the foam - cut any excess tubing off.

https://www.4shared.com/img/-Eb_4lhYca/s25/15d0b256390/182-8223_IMG (https://www.4shared.com/photo/-Eb_4lhYca/182-8223_IMG.html)

—Add 1 expanded copper scrubber or steel wool pad loosely in the OCC to take up the space between the foam filter and bottom of the OCC, this will neutralized the heavy liquids from the vapors.

https://www.4shared.com/img/_1JlEqQ7ca/s25/15d0b256778/182-8224_IMG (https://www.4shared.com/photo/_1JlEqQ7ca/182-8224_IMG.html)

—Reassemble the OCC, then mask and paint to your color choice.

https://www.4shared.com/img/d06xewnvei/s25/15d0b25d0f0/OCC_3 (https://www.4shared.com/photo/d06xewnvei/OCC_3.html)

OCC Mounting [B6 only]

—Remove tab and bend edge straight approx. 3”, then cover edges with 1/8” adhesive neoprene foam.

https://www.4shared.com/img/pglBzkEAca/s25/15d0b251958/181-8199_IMG1 (https://www.4shared.com/photo/pglBzkEAca/181-8199_IMG1.html)
https://www.4shared.com/img/IYFtvpCPei/s25/15d0b25c150/IMG_82611 (https://www.4shared.com/photo/IYFtvpCPei/IMG_82611.html)

—Attach 1/4” adhesive neoprene foam to back of OCC where the threaded provisions are. The OCC will hold straight and securely in place as-is in the cage.

https://www.4shared.com/img/PIOeLHynca/s25/15d0b258aa0/182-8292_IMG (https://www.4shared.com/photo/PIOeLHynca/182-8292_IMG.html)

[Sorry I have no mounting specifics for the B7 as the cage found in B6’s has been eliminated. The OCC can be mounted in the same area but a custom bracket will need to be made most likely.]


—Remove PCV Valve
—Inspect and clean [replace if necessary]

https://www.4shared.com/img/Br2zl19gei/s25/15d0b252510/181-8200_IMG1 (https://www.4shared.com/photo/Br2zl19gei/181-8200_IMG1.html)
https://www.4shared.com/img/1AL1hY0vei/s25/15d0b2d4ee8/182-8202_IMG (https://www.4shared.com/photo/1AL1hY0vei/182-8202_IMG.html)

—Place OCC in desired mounting location and mock up the hoses noting all measurements.
—Cut hose to measured lengths and rough assemble system. Tweak all connections as necessary and note all adjustments before installing the crimp clamps.

https://www.4shared.com/img/XS3msLQica/s25/15d0b25d4d8/OCC_Diagram (https://www.4shared.com/photo/XS3msLQica/OCC_Diagram.html)
https://www.4shared.com/img/Nf5K2LGrca/s25/15d0b253898/182-8216_IMG (https://www.4shared.com/photo/Nf5K2LGrca/182-8216_IMG.html)
https://www.4shared.com/img/DQVVvttPca/s25/15d0b25a5f8/183-8328_IMG (https://www.4shared.com/photo/DQVVvttPca/183-8328_IMG.html)
https://www.4shared.com/img/hfVBrtEOei/s25/15d0b256f48/182-8267_IMG1 (https://www.4shared.com/photo/hfVBrtEOei/182-8267_IMG1.html)

—Remove system and install crimp clamps to OCC fittings, barb reducer fittings, and PCV elbow. Take care not to rotate any of the hose connections while clamping.
—Reassemble system and make sure it all lines up and fits right.
—Finalize the install by using the worm clamps on crank breather hose and PCV connections. Strap together hoses running to OCC and re-place vanity cover.

https://www.4shared.com/img/Fb_FoxVNca/s25/15d0b2582d0/182-8281_IMG (https://www.4shared.com/photo/Fb_FoxVNca/182-8281_IMG.html)
https://www.4shared.com/img/Vo1QYeIaca/s25/15d0b257718/182-8273_IMG (https://www.4shared.com/photo/Vo1QYeIaca/182-8273_IMG.html)
https://www.4shared.com/img/Lewo94Adei/s25/15d0b30bdd0/182-8267_IMG (https://www.4shared.com/photo/Lewo94Adei/182-8267_IMG.html)

The finished product [:D]

https://www.4shared.com/img/jprAW_nWei/s25/15d0b259270/182-8295_IMG (https://www.4shared.com/photo/jprAW_nWei/182-8295_IMG.html)

08-28-2011, 01:59 PM
very nice work and writeup

08-28-2011, 08:26 PM
very nice! looks real good.

08-28-2011, 08:53 PM
can someone explain what this exactly does to help? Never seen this before.

08-29-2011, 08:40 AM
Keeps oil from entering the intake charge through the PCV system

Mr. Goodwood
08-29-2011, 09:03 AM
can someone explain what this exactly does to help? Never seen this before.

I'm thinking the same thing, I know on RS4 it may help with Carbon Build-up. I might be missing something but what would be the benefit on an S4?
Awesome work though, looks nice and neat.

08-29-2011, 09:42 AM
If I'm not mistaken, as far as RS4 goes, it turned out to be no improvement with carbon buildup :(

08-31-2011, 07:37 PM
Thanks for the comments on my work!
An oil catch can is really only as good as its baffle, and so far [3000mi of driving] the one I made is doing a great job, no oil is passing into the OCC outlet hose and my PCV valve has been staying dry. I estimate I will have to service the baffle once annually which will consist of changing the foam filter and steel wool inserts plus replacing the top gasket.

08-31-2011, 07:58 PM
I assume the foam is closed-cell and snug in the housing, so the chance of sucking bits of steel wool through/past it into the inlet are very small. Yes?

08-31-2011, 09:08 PM
I assume the foam is closed-cell and snug in the housing, so the chance of sucking bits of steel wool through/past it into the inlet are very small. Yes?

Yes and thats the idea besides extra filtration. I noticed most other OCC's on the market and homemade use coarse steel wool or scrubbers alone and I didn't feel comfortable with that.

08-04-2016, 08:37 PM
What about oil consumption issue ,how often u have to drain unit