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Oil Catch Can on OM642 engine ?

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Wighty, Oct 21, 2016.

  1. oigle

    oigle Senior Member

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    Does the outlet then go back into the inlet manifold system? If so, that would work well. Venting to atmosphere is not the way to go.
    Ian.
     
  2. LostKiwi

    LostKiwi Senior Member

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    Yep. It basically sits inline in the existing system. The one I use also has a screw down lid in the top with a seal on it to make it easier to empty.
     
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  3. OP
    Wighty

    Wighty Senior Member

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    Yep, as LK says it just sits in the middle of the existing system to "catch " the sludge
     
  4. oigle

    oigle Senior Member

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    What advantage do you think you are getting by installing such a device? The normal system burns the oil vapour anyway and some suggests that it may help to lubricate flap spindles. Does the crud buildup in the inlet manifold of diesels lessen with the removal of the oil vapour? What else could benefit? I removed the crud by eliminating the egr from the system.
    Ian.
     
  5. LostKiwi

    LostKiwi Senior Member

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    Mine's fitted to my petrol Smart Roadster.
    It reduces the build up of oil in the intercooler and inlet pipework. On the smart the breather feeds into the atmospheric pressure side of the turbo so cruds up a long tract of the inlet from turbo, through turbo, intercooler, throttle body and inlet manifold. There's no need for oil in the inlet tract on these as there's nothing to lubricate. All it ends up doing is coating the intercooler core in oil.
     
  6. alexanderfoti

    alexanderfoti Moderator

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    Its purely an emissions thing, Depending on how good the oil separator is, the only thing going back into the inlet should be clean air, but the hockey puck type centrifugal separators do not work that well on turbo'd engines, so an amount of oil vapour comes back into the inlet. Its the exact same thing you are trying to avoid with your EGR removal. Oil vapour mixed with dirt creates a sludgy mixture that clogs up throttle valves etc.
     
  7. OP
    Wighty

    Wighty Senior Member

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    Yep, that's what I'm aiming for , I don't want to delete the egr , but if I can stop the oily sludge making its way through the turbo and gunging everything up by emptying a catch can every few months I'll be happy for the few quid its cost . On the Om642 engine also , it should save £18 on new turbo inlet seals each time the y piece with the mafs in are removed .
     
  8. oigle

    oigle Senior Member

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    Be interesting to see how much effect it has on gunge buildup. Be good to get feedback from those who do it. The diesel particulates that are the basis for the gunge are quite oily themselves so there may not be a lot of difference.
    In a petrol engine, what ill effect is caused by some oil coating the inside of the inlet system? Very little if any would be my guess.
    Ian.
     
  9. OP
    Wighty

    Wighty Senior Member

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    I'll update the post in a month with "gunge" quantity :D
     
  10. oigle

    oigle Senior Member

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    Need more like a 6 month test but 1 month is better than none. Has anyone had this setup longer that can report?

    Ian.
     
  11. OP
    Wighty

    Wighty Senior Member

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    The post in a month is just the "first" report , I can milk this for years :D
     
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  12. LostKiwi

    LostKiwi Senior Member

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    Probably no harm at all (apart from gumming up the intercooler and reducing its efficiency). It does make it much nicer to work on when its not full of oil though.
     
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  13. alexanderfoti

    alexanderfoti Moderator

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    On turbo'd engines this oily mixture reduces octane as well which is no fun!
     
  14. oigle

    oigle Senior Member

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    You'd need to be getting a lot of oil through to have any noticeable effect on the octane rating of the fuel being burnt.

    Ian.
     
  15. alexanderfoti

    alexanderfoti Moderator

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    Sure, but when you are on the ragged edge of timing with 99 octane fuel and meth injection to bump it up even more it affects it quickly.
     
  16. OP
    Wighty

    Wighty Senior Member

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    image.jpeg This is what the catch can caught after 3 hours driving . I thought it would be oilier .
     
  17. alexanderfoti

    alexanderfoti Moderator

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    Makes sense, most of it will be water.
     
  18. LostKiwi

    LostKiwi Senior Member

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    I'd have thought it would be blacker - the stuff my Smart chucks out is pitch black and runny as water....
     
  19. alexanderfoti

    alexanderfoti Moderator

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    Ah but is that after 3 hours?

    Plus the smart engine will be under boost much more due to its smaller size so will blow more oil back that way.
     
  20. LostKiwi

    LostKiwi Senior Member

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    No - more like 3 months by which time there's about 1/4 litre. The Smart is rarely off boost ;) (it also runs 21psi boost which is a lot for a little engine!)
     

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