OCC Working Great!

I'm curious, where is your OCC mounted?

I'm thinking about relocating my OCC, which currently sits on top of the front crossmember, under the airbox, to a position next to the engine coolant reservoir.

However, I'm wondering if the extra length hoses needed to route to this area will affect the vacuum levels in the PCV system appreciably.

Those that have their OCC mounted behind the driver's side headlight probably have a comparable length of tubing to the OCC relative to the PCV valve on the engine.

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Wow, all that could have gone into your intake?

 

Not could've, would've. That's why there's usually a pool of oil sitting in the intake manifold under the throttle body waiting to be aspirated into the engine.

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Some probably still did (still make it to the intake, and combustion chamber too); nothing is 100% effective at waylaying PCV oil vapours. But it sure reduces it, as you can see. I run dual Moroso 85474 in series, and the second one in line often has MORE stuff than the first, especially in spring. This is due to more humid winter weather I think. To be fair, the catch in the second can is mostly water.

 

Wow, snug as a bug in that location. Are you able to lift the can out of there with the hoses attached when it comes time to empty the OCC?

Also, something to consider, that OCC has fittings that are the same 16x1.5mm thread as the PCV valve. Which means you can swap a fitting into the original PCV valve location and move the PCV valve to the OCC outlet. It would keep the PCV valve cleaner and make changing it so easy.

The thing I haven't determined yet is whether the open OCC fitting in the original PCV valve location passes more, or the same amount of oil/vapors to the OCC.

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Your OCC location inspired me to move the OCC in our 2014 Corolla. It was previously mounted to a bracket that I affixed under the battery tray. However, it was difficult to reach around the radiator hoses to get at the OCC.

This location is perfect, higher than the PCV outlet on the engine block, and easy to access the OCC to check and empty. Also, it's away from the rear of the radiator and the heat, so I'm hoping to get more oil condensing out of the vapor phase. It's mounted on a bracket bolted on a stock bracket location on the engine block.



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Regarding messing up the threads on the original PCV valve location, you don't have to worry about that since the OCC fitting is aluminum, which is much softer than the steel thread's on the PCV valve mounting plate.

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FWIW, the PCV valve screws into a bolted-on plate, covering a rudimentary labyrinth in the block. Still, it's really on there, bolted plus a bead of sealant, which makes for a real job to pry off.

Still, I'm not sure I see the advantage of shifting the PCV valve.

 

This is where I have mine mounted. Easy access from below with every oil change.

 

I try to avoid taking off the undercover at all costs. Nothing easy about jacking up the front end, placing jackstands, removing the cover, etc.

I want to be able to check the OCC easily, without a jack or ramps.

I'm thinking of locating my OCC next to the engine coolant reservoir. I have completed the mounting bracket, I just need to remove the OCC from the crossmember and reroute the hoses. The OCC in the picture is a new one that will be mounted on a third vehicle.

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Ya I can understand that if your can is filling up frequently. For my car, I can get away with emptying it every third oil change. I also live in California so mine needs to be hidden.

 

Update: There seems to be too much oil mist getting past the OCC and condensing in the tubing after the OCC, as there is a fair amount of oil in the hose leading to the intake manifold. I see OCCs with sintered bronze filters for sale, but they seem to be too restrictive for air flow. I got some and sure enough, no light can be seen through the bronze filters, so it is easy to believe that any oil or particles can easily clog this fine filter material.

I got some very fine mesh stainless steel screen from Amazon and fashioned a filter by cutting a 12 x 3 inch strip and rolling it up into a tube. This is ziptied to the screw on filter canister that holds the steel wool. I then squeezed the bottom end of the tube flat and used a sheet metal seaming tool to double fold the end over.

I had to additionally bend the corners over as well so that it would clear the inside of the OCC can's walls.

The filter is at least 3 layers thick and light can still be seen through it.

Lastly, I believe that the OCC is mislabeled. The port marked IN should be the output side, you want the oil to condense on the filter and drip down into the can before exiting.

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Installed OCC on the left side of the motor in the space down by where the washer fluid container is.
As in this location the OCC bracket, which came with the OCC I ordered, could be bolted to. As well as sufficient space for the hoses in and out of it.
Strongly recommend not installing down there. As each time I empty it out, which was about once over this past Winter, required unbolting the left side black plastic air filter related component. Can then reach down and untwist the OCC. To facilitate doing this requires disconnecting the MAF sensor. Taking it off requires a bit of force. Vehicle harness clips aren't designed to be taken on and off monthly.
If/when the clip eventually breaks or wears out it may require a tow, and being at the mercy of to the dealership to repair it.
Yes you could jack up car, remove the underneath covers, and then reach up to access the OCC.
But am not trying to go through all that on a monthly basis either.
Was a person on PriusChat years back who 3D printed and sold a white plastic OCC holder which fit on the top right side over by the fuse box. When clicked on the link to buy it, it was no longer available for purchase.
Would not have to repeatedly remove air flow related components, and jeopardize the MAF sensor clip, if had been installed in that location.

 

@sLick415

I am glad I saw your post, I was looking all over for a stealth location.

I remember seeing one a long time ago but could not find it again.

I also live in California so want it hidden just in case.

I will be doing my own oil changes so it is a perfect location.

Thanks for sharing!