Oil Catch Can, Eliminate that knock!

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by danlatu, May 22, 2017.

  1. mjoo

    mjoo Senior Member

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    I've had an OCC for close to 4 years and haven't needed to add steel wool. In the cool Michigan climate the engine has not startup knocked yet. But no oil burning yet so YMMV.

    moto g power ?
     
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  2. ozmatt

    ozmatt Active Member

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  3. AW82

    AW82 Member

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    I found this article explaining how catch cans work and with some helpful diagrams for how PCV systems work. Interestingly, they recommend a catch can on the crank vent line (coming off the valve cover) also. Seems probably unnecessary on the Prius. (of course, they're advertising their own product in this blog, which I have no endorsement for or experience with).


    Blog Post Catch Cans 101
     
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  4. Mendel Leisk

    Mendel Leisk Senior Member

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    Hmm, you could run that line to-and-from the Oil Catch Can(s) too, with T-connections.
     
  5. AW82

    AW82 Member

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    I think it would need to be a separate catch can. Otherwise, you would be creating a big vacuum leak and probably messing up the intended flow of clean air into the top manifold port.
     
  6. Mendel Leisk

    Mendel Leisk Senior Member

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    Well I DO have 2 Moroso’s...

    I better give my head a shake, for now, lol.
     
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  7. Rocky Mountain Priusman

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    Your setup looks pretty sweet. Double high quality catch cans! Will be excited to see if you think this was worth it.

    I was able to get 1/2 inch PEX fittings (male on each side) pressed into the OEM hose cut in half. Took a small amount of grunting but they did go in (I hope the hose doesnt spit when it gets cold or something like that, but I am also not the strongest individual so if I was able to press them in by hand I dont think they are too crazy tight). I then just plumbed the entire system (using Amazon Ruein catch can) onto 1/2 inch ID fuel line - easy peasy. The Amazon catch can came with 1/2" (or something close to that probably in a metric size) fittings.

    Can't really vouch for effectiveness since I havn't used it much yet but I dont see why it wont work. Now the question is do I trust the steel wool that came with the Amazon catch can or buy a higher quality that might not shed metal pieces. Anyone have a recommendation on best steel wool to use?
     
  8. jzchen

    jzchen Senior Member

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    I was thinking aloud:

    "Three's company, four's a crowd". I was very irritated in thinking of suggesting you put yet a third. Then I realized the proper statement is "two's company, three's a crowd"...

    moto g(7) power ?
     
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  9. Rocky Mountain Priusman

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    Thats a pretty good idea but it doesnt really seem to be sufficient for the requirements of the Prius. Maybe we should be installing "oil catch tanks". You know, maybe a 10 gallon tank with 3-4 seperate chambers, filters, a drain plug, maybe install a Oil Catch Tank Computer Management Module (OCTCMM) and ECU to provide data feed from each tank, including fullness level, temperature, oil dew point, exhaust carbon analytics, viscocity metrics on collected sludge, water vs oil content, pressure in each chamber etc. Would need a system of pumps for actively managing pressure in each tank, as well as a series of electonically actuated PCV valves. Could drill a hole in the bottom of the intake manifold and install a vaccum system that would move any oil the system that did not catch from the intake manifold back into the catch tank. Could place it in the rear footwell, or in the gap between the engine and the firewall.




    ;):ROFLMAO::ROFLMAO::ROFLMAO:
     
    #2009 Rocky Mountain Priusman, Mar 30, 2021
    Last edited: Mar 30, 2021
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  10. Mendel Leisk

    Mendel Leisk Senior Member

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    1855 kms since the fall drain, which yielded next to nothing, drained this at my spring oil change yesterday. I have two Moroso 85474 air/oil separators in series. Left side is first, about 50 cc, and maybe 50% oil. Right side is the second can, about 75 cc, mostly water (at bottom), with a skim of oil.

    FD1A2771-54BA-44F1-B039-B9F67A105D3B.jpeg
     
    #2010 Mendel Leisk, Apr 14, 2021
    Last edited: Apr 15, 2021
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