Oil Catch Can, Eliminate that knock!

Good question. Not a whole hell of a lot of km's but occasionally I will go on a big road trip and do about 800 kms in a weekend. Other times its a hand full of short trips around town. I'll pay more attention the next cold spell we get and put down some clear data.

 

Rebound, can you imagine the rebound of current owner complaints if suddenly, Toyota started putting OCC's on. Financial nightmare. Just fix the ones under warranty, and the rest will just have to suffer. We'll fix it in the next refresh.

 

Nah they already have "catch cans" its built into the block. But as has been said in this thread their efficiency is only so high. But that little port window cover that bolts onto the block with the pcv valve threaded into it is your baffled air/oil seperator. So more than likely they will redesign it every generation to make it better not add one. I actually dumped some e85 through mine last week when i did my whole cleaning shenanigans to do a low effort clean on it.

 

Brief follow-up of my #2083 post on page 105. I checked my OCC reservoir yesterday, after 4800km (15.09.2022 - 01.01.2023). The cyclonic separator coupled with the OCC (transformed in a simple receptacle) works. Collected more than 100 mL of water-oil emulsion and thus prevented it from going up the intake. This is the effect of (mainly) short trips (3-5 km) in cold weather:

 

Had the intake manifold off, cleaned the PCV valve and OCC’s, put everything back together, and it sat thus, for 4~5 days.



Today was the first drive since, do-or-die run to pick up people from airport. Got about 100’ and uhoh…: sounds terrible, check hybrid system, check engine and yellow triangle with exclamation mark. Ugh…

managed to roll into a parking space, ran back and got tools. Air box off, what ho: hose from OCC to intake manifold not connected.

Fixed and off I go, everything seems good, ‘cept lights persist. Next few starts, lights shut off, one by one. All gone now. Whew…

moral of the story: when you have an important drive pending, and have done some work, do yourself a favour, test drive.

 

Yep!! For me, not sure if it has to do with more grey hairs, but I have to triple check my work. Forget to replace the oil cap on the valve cover after a routine oil change anyone?

 

Have a check list, and check it off....

 

Yup. Now when I take it off I put it atop the hood latch mechanism.

 

LOL Mendel!! Yep, now we put things in the way of finishing a project...............that way we can't finish it without seeing what we may have forgotten.

 

With the intake manifold I think I need a check list, of what's connected to it. Pretty short list never the less. Create the list as you pull stuff off the intake manifold, and tick it when reconnected. The hose from OCC (or PCV valve, if you don't have a can) has to be connected after the intake manifold's installed. and the connection's a little hidden. You're tired, it's late..., yeah, a check list.

As far as hoses go it's the PCV and the EVAP. But yeah, either one of them left off will really upset it.

And reconnect the MAF electrical. And tighten down the clamp between throttle body and air box. And...

 

Does someoane have any experience with frozen OCCs during winter and excessive pressure buildup in the crankcase? I was worrying about this possibility and that's why I've chosen the cyclonic oil separator instead of a mishimoto-style OCC with 50 microns bronze filter on the outlet. However, I think that only serious frost might lead to obstruction, because of the emulsion composition.

 

I don't, but if a catch can is blocked by ice, wouldn't blowby gases escape though the (normally) intake hose instead of building up excessive crankcase pressure? Of course, that wouldn't be a desirable situation either.

 

Someone had a cool trick to the catch can and the result was the content or fluid remain fluid. I can’t recall right now because the wine is kicking in quicker than I thought. Hopefully I remember what the trick was sometimes tomorrow and post it hete

 

When the oem's feel the pcv line will have freezing or condensation problems they use polyfoam insulation around their vacuum hose on their pcv systems. Toyota uses it on their top mounted lines, but the prius is bottom mounted and doesn't use any. I guess the cooling effect of the hood is what they are mostly worried about. I have heard the subaru guys say they are afraid of the cold weather issues so they run catch cans that hug the block better.
Also the intake port is also an exhaust port so if one line freezes you still have another so you should be good.

 

I had my catch can bolted to the engine block under the manifold. There was a couple of extra casting holes there. I think the engine heat helped keep the thing liquid. I never saw mine frozen.

 

I ordered a new Mishimoto-style, Long OCC. As compared to the Ruien-style OCC I already have (and currently use only as a receptacle for the cyclone-separated fluid), this new one has additional baffles, a sintered bronze filter, drain valve and most important - it is double in size (63mm Dia x 183mm Length).
I intend to modify the current setup, get rid of the cyclone separator and use the same location as Mendel Leisk did, on the front beam. This morning it occurred to me that I could do a dual catch can setup using both the old and new OCCs. However, I remember reading from Mandel's experience that the second one is collecting more than the first one, am I correct? Mendel? Could you please indicate the page where you posted your experience? I can't find it anymore... Thank you!
In my case, the catch cans are different shape and size and I consider the new larger one more efficient, so I'm trying to figure out the correct installation order.

 

I would put the theoretically more efficient OCC after the Ruien type OCC.

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It makes sense, separation first, purification last, assuming the second OCC is more efficient. In this case, I think that most of the fluid accumulates in the first catch can. I have to test it and figure it out, there are too many variables, because of the differences between the two OCCs...

 

I’m using two Moroso 85474 in series, so which comes first doesn’t matter lol.

I drain them April and October, in conjunction with oil changes. With the October drain it’s mostly the first can, mostly oil, very little from the second one. The April drain the first can’s about the same, and second can will be at least as much, or a bit more, with a mix that’s 50% or more water.

If you mount a bracket on that lower beam be cognizant it wants to flex, especially if you’re using the front/centre jacking point (on underside of that beam). You want any connection between the bracket and the beam to have some, say a rubber gasket that can compress.