Catch Can disappointment pics inside

Discussion in 'Engine & Drivetrain' started by ivin74, Sep 5, 2017.

  1. ivin74

    ivin74 05 Yukon Denali

    Posts:
    538
    Likes Received:
    163
    Joined:
    Aug 3, 2014
    Location:
    Pearland, Texas
    Name:
    Ivan
    Hello to you all
    Several weeks ago I changed the oil on my suv and noticed an oil leak by the intake manifold so this weekend I decided to find this mysterious leak. After I removed the intake manifold I realized the leak was coming from the valley cover. So with the intake manifold off I was able to see the head air intake ports and was shocked to see them coated with oil. Four years ago when I installed the catch can I removed the intake manifold and cleaned all the ports and believe me what a pain in the A$$ it was to get them cleaned. During all the oil changes (Appx 5 changes w synthetic oil) I always drain the catch can and it always had oil. I assume it was doing its job well and was hoping to see the intake valve ports clean not what I saw. Has anyone else had this issue in the past?

    The catch can I bought has an internal screen and don't understand how the oil would still go thru it. The catch can is also located in the passenger side fenderwell mounted to the frame, that also has me shocked because the oil has to travel up a distance to the air intake manifold.

    Catch Can.jpg Catch can filter.JPG SnipImage 1.JPG Dirty intake valve port.jpg Left side intake valve ports_dity.jpg
     
  2. ivin74

    ivin74 05 Yukon Denali

    Posts:
    538
    Likes Received:
    163
    Joined:
    Aug 3, 2014
    Location:
    Pearland, Texas
    Name:
    Ivan
    After cleaning the head ports again I also replaced the screen inside the catch can. I also installed an inline fuel filter on the vent line right at the intake manifold. I made sure I had a clear filter so I can see if oil starts to seep up the vent line again. I guess time will tell it this works.

    Clean intake valve port.jpg Fuel Filter on vapor line.jpg
     
  3. iamdub

    iamdub We need a new plague.

    Posts:
    4,627
    Likes Received:
    4,100
    Joined:
    Apr 23, 2016
    Location:
    State Capitol Raceway, LA
    Name:
    Chris
    I have the same catch can. I didn't think they were anywhere near 100% effective, but I'd hope for less buildup than that.

    No chance on that being deposits from the fuel? I'm doubting this as I type it because it looks like the ports are clean on the walls and it's just the floor that's gunked up. But, I can't tell for sure from the pics. I'm looking forward to what you find with the fuel filter.
     
    ivin74 likes this.
  4. ivin74

    ivin74 05 Yukon Denali

    Posts:
    538
    Likes Received:
    163
    Joined:
    Aug 3, 2014
    Location:
    Pearland, Texas
    Name:
    Ivan

    I don't think is gasoline gunk because I noticed oil on the intake manifold. When I cleaned the ports the first time I also cleaned the intake manifold. I'm going to monitor the clear fuel filter it and post any findings in the next few months
     
    Last edited: Sep 6, 2017
  5. iamdub

    iamdub We need a new plague.

    Posts:
    4,627
    Likes Received:
    4,100
    Joined:
    Apr 23, 2016
    Location:
    State Capitol Raceway, LA
    Name:
    Chris
    I wasn't doubting you! I was more like trying to be optimistic, giving the benefit of the doubt from what I couldn't ascertain from the pics. I'm sorry to learn that these things aren't nearly as effective as we had thought. But, at least they're doing something. I recall seeing in a thread of someone running two catch cans in series, but I don't know if they ever reported of their efficiency.
     
  6. ivin74

    ivin74 05 Yukon Denali

    Posts:
    538
    Likes Received:
    163
    Joined:
    Aug 3, 2014
    Location:
    Pearland, Texas
    Name:
    Ivan


    Got you, at least its picking up some oil.

    I also wonder the efficiency of two catch cans.
     
  7. MINIz guy

    MINIz guy Full Access Member

    Posts:
    99
    Likes Received:
    75
    Joined:
    Jun 19, 2017
    Name:
    Rico Suave
    I'm definitely no expert but I'll offer my 2 cents.

    It's a fine balance between catching everything (restricting flow) and not impacting the crankcase pressures (lots of flow). You gotta slow down the air so that the heavy carbon, oil, fuel, water particles fall out of the crankcase air. Too slow and you build up a lot of positive pressure and I'm not exactly sure what that impacts. I'm guessing those green filters won't get down to super small particles, and that is why you're still seeing buildup.
     
    ivin74 likes this.
  8. Kenny D

    Kenny D Full Access Member

    Posts:
    1,183
    Likes Received:
    1,082
    Joined:
    Feb 5, 2017
    Location:
    Crosby, Tx
    Name:
    Ken
    Could be the location of the hoses. I believe the incoming air/oil mixture should be going into the tank and the filtered air should be exiting the can through baffle/filter media and out the top. JMO
     
  9. iamdub

    iamdub We need a new plague.

    Posts:
    4,627
    Likes Received:
    4,100
    Joined:
    Apr 23, 2016
    Location:
    State Capitol Raceway, LA
    Name:
    Chris
    Every time I think about it, this makes the most sense to me. Really, I don't see the harm in trying it out. It would be a long-term test, though.
     
  10. SnowDrifter

    SnowDrifter Full Access Member

    Posts:
    634
    Likes Received:
    263
    Joined:
    Sep 5, 2016
    Location:
    Wa
    Name:
    Chris
    I have a catch can on mine. Usually get 2 maybe 3 ounces out of it over the course of an OCI
     

Share This Page