2nd Gen JCW Positive Crank Case Ventilation

Discussion in '2nd Generation: 2007+ R55 through R61' started by Jason Montague, Oct 29, 2011.

  1. Jason Montague

    Jason Montague New Member
    Lifetime Supporter

    Jan 5, 2010
    6,134
    1,587
    0
    Physician Assitant (retired)
    Sherman,Tx
    Ratings:
    +1,587 / 0 / -0
    :confused:Important(to me) question to the gear heads. Car in question: 08 R56 MCS/JCW 6sp manual. I'd post pictures but I'm computer stupid. The bonnet is up and we're in front of the car looking at the engine, specifically the valve cover. The PCV hose comes up posteriorly from the crank case and enters the left rear of the valve cover. Where does it go from there? Does it empty into any thing? Another hose exits the right side of the valve cover and empties into the turbo intake hose. Where does it originate? Is it just an extension of the PCV hose? I really need to know to solve a problem.:Thumbsup:

    Thank you,

    Jason Montague
    De Oppresso Libre
     
  2. Metalman

    Metalman Well-Known Member
    Lifetime Supporter

    Sep 29, 2009
    12,569
    7,457
    113
    Owner of a small custom metal fabrication company,
    Columbus, Ohio
    Ratings:
    +7,495 / 1 / -0
    #2 Metalman, Oct 29, 2011
    Last edited: Oct 29, 2011
    Are you still staring at your engine......???

    The "S" has a somewhat unique PCV system. it's controlled by a set of valves inside the plastic valve cover. There is a built in system of traps, a maze and a cyclone separator that try to separate and condense the oil back into the crankcase. This system in the valve cover is not serviceable. There are also a couple of pressure control valves that open and close based on vacuum or turbo pressure...... basically if it's under load or not.
    At idle and slightly above when the system is under engine vacuum the flow is out the PCV at the firewall. When the system goes from vacuum to pressure the flow is out the front hose going to the cold inlet side of the turbo. Only one path direction is operating at a time, not both.
    They both end up delivering fumes to the intake side of the engine through the intake manifold. The second path goes through the turbo and unfortunately also can end up coating the inside of the inter cooler chamber with oil film residue.

    All of the flow direction originates at the valve cover and end up at the intake manifold leading into the head past the intake valves.... leaving a little carbon presence as they are drawn into the combustion chamber.

    There ya go....:D
     
  3. Jason Montague

    Jason Montague New Member
    Lifetime Supporter

    Jan 5, 2010
    6,134
    1,587
    0
    Physician Assitant (retired)
    Sherman,Tx
    Ratings:
    +1,587 / 0 / -0
    #3 Jason Montague, Oct 29, 2011
    Last edited: Oct 29, 2011
    :cornut:Yes Sir. May I stand at ease now and quit starring at my engine?:lol: Thank you very much you've more than answered my question. So my baffled BSH oil catch can with the dip stick and syringe drainage which has been collecting a lovely shade of orange/brown oily/watery engine snot is doing the whole job and the left side pcv/crank case hose doesn't need to be modified at all,right? The people at MA are always 'in the know.':Thumbsup:

    Jason
     
  4. Justa Jim

    Justa Jim Well-Known Member
    Lifetime Supporter

    May 6, 2009
    7,422
    1,678
    113
    Ratings:
    +1,678 / 0 / -0
    In other words, the PCV line passes distal to the valve cover, over the large intestine and proximal to the valves, thus depositing carbon build up. This can be avoided by taking Clarvisan, so you don't notice it. :Thumbsup:

    Jim
     
  5. Rixter

    Rixter Well-Known Member

    Jun 14, 2009
    1,230
    79
    48
    Technology Architect
    North of the 49th
    Ratings:
    +79 / 0 / -0
    What'd he say? :crazy:
     
  6. Jason Montague

    Jason Montague New Member
    Lifetime Supporter

    Jan 5, 2010
    6,134
    1,587
    0
    Physician Assitant (retired)
    Sherman,Tx
    Ratings:
    +1,587 / 0 / -0
    #6 Jason Montague, Oct 29, 2011
    Last edited: Oct 29, 2011
    :cornut::crazy: I've got to ask. What is Clarvisan? A drug or a MINI additive or some thing else entirely?:Thumbsup:
    jason

    One little peeky in the drug book and----you put Clarvisan Ophthalmic gtts in your eye such that you don't notice any thing. OK,got it!
     
  7. Justa Jim

    Justa Jim Well-Known Member
    Lifetime Supporter

    May 6, 2009
    7,422
    1,678
    113
    Ratings:
    +1,678 / 0 / -0
    Good man Jason, now drop and give me 10. :Thumbsup:

    Jim
     
  8. Jason Montague

    Jason Montague New Member
    Lifetime Supporter

    Jan 5, 2010
    6,134
    1,587
    0
    Physician Assitant (retired)
    Sherman,Tx
    Ratings:
    +1,587 / 0 / -0
    :lol::lol::lol::lol::lol::lol::lol::lol::lol::lol::lol::lol::lol::lol::lol::lol::lol::Thumbsup:

    Jason
     
  9. k-huevo

    k-huevo Club Coordinator

    May 6, 2009
    683
    159
    0
    Pipe Creek, Texas
    Ratings:
    +159 / 0 / -0
    The yellow disc in the photo is the valve cover air/oil separator. When this stops doing its job, case pressure builds enough to force oil past the valve cover gaskets.

    [​IMG]
     
  10. Jason Montague

    Jason Montague New Member
    Lifetime Supporter

    Jan 5, 2010
    6,134
    1,587
    0
    Physician Assitant (retired)
    Sherman,Tx
    Ratings:
    +1,587 / 0 / -0
    :cornut: So what happens when one plugs off the crank case PCV line with a BSH dual port valve and runs the valve cover egress PCV line through an OCC and captures large amounts(usually 1oz/100mi)of dinosaur snot prior to that line entering the Turbo intake hose. Is all okay with the PCV system while the intake valves remain sparkling clean?:Thumbsup:

    Jason
     
  11. Norm03s

    Norm03s New Member

    May 5, 2009
    4,936
    534
    0
    Working at being retired.
    Somewhere in Sykesville. Md.
    Ratings:
    +534 / 0 / -0
    Is this the same cyclone separator set up in the 2nd gen. Cooper?
    A friend is having her valve cover replaced because her Cooper started using a lot of oil.
    It was so bad it fouled a plug.
    Maybe it will need a treatment of that stuff (Seafoam) to DE-carbonize the intake valves.
     
  12. KenWarren

    KenWarren New Member

    Feb 23, 2012
    26
    4
    0
    BI consultant
    SE Pennsylvania
    Ratings:
    +4 / 0 / -0
    Seafoam will probably not decarbonize the intake valves. If there's much carbon build-up, blasting with walnut shells is the only real answer.
     
  13. Norm03s

    Norm03s New Member

    May 5, 2009
    4,936
    534
    0
    Working at being retired.
    Somewhere in Sykesville. Md.
    Ratings:
    +534 / 0 / -0
    Bummer, that would require head removal. Maybe some gas additive.
     
  14. DneprDave

    DneprDave Well-Known Member
    Supporting Member

    Oct 23, 2010
    2,884
    1,430
    113
    Engineer
    Pacific NW
    Ratings:
    +1,590 / 0 / -0
    No, walnut shell blasting is done with the head in place. The dealer has a tool for just that purpose.

    Dave
     
  15. KenWarren

    KenWarren New Member

    Feb 23, 2012
    26
    4
    0
    BI consultant
    SE Pennsylvania
    Ratings:
    +4 / 0 / -0
    Is it an S or JCW (thus DI, probably has carbon buildup on the intake valves, never mind the fouled spark plug you mentioned above) or is it "just a" Cooper, which uses port injection and shouldn't have any carbon issues?
     
  16. Norm03s

    Norm03s New Member

    May 5, 2009
    4,936
    534
    0
    Working at being retired.
    Somewhere in Sykesville. Md.
    Ratings:
    +534 / 0 / -0
    It is "just a" Cooper. Good news for my friend!
     
  17. KenWarren

    KenWarren New Member

    Feb 23, 2012
    26
    4
    0
    BI consultant
    SE Pennsylvania
    Ratings:
    +4 / 0 / -0
    Carbon buildup can still happen on the intake valves, but it's enormously less likely since they're washed by the injected fuel. The DI engines get the gunk from the PCV system, but nothing to wash it off the valves. That's why they coke up over time.
     
  18. Crashton

    Crashton Club Coordinator

    Jun 4, 2009
    18,965
    9,505
    113
    Retired old fart
    Hooterville Ohio USA
    Ratings:
    +10,649 / 2 / -0
    Tell your friend to run a bottle of Chevron Techron through it before each oil change. Cheap cleaning that will help keep the carbon at bay.
     
  19. Norm03s

    Norm03s New Member

    May 5, 2009
    4,936
    534
    0
    Working at being retired.
    Somewhere in Sykesville. Md.
    Ratings:
    +534 / 0 / -0
    Will do.
     
  20. countryboyshane

    countryboyshane New Member

    Jul 23, 2009
    202
    77
    0
    Diesel Engineering
    Bloomfield Hills, MI
    Ratings:
    +77 / 0 / -0

    This is not true for the direct injected N14/N18 engines. The fuel additives may clean the combustion chamber a bit, but will not combat carbon buildup on the back of the intake valves and in the intake ports. This is all because of the nature of direct fuel injection.
     

Share This Page