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Thread: 4age after turbocharging. What do I do with the breating cam cover??

  1. #1

    Default 4age after turbocharging. What do I do with the breating cam cover??

    Hello Forum,

    nice to be here. I have a 4age I have turbocharged sitting in a ae86. I've bunged up the plenum ( from where the original breather pipe went from the cam cover to the inlet plenum )

    Now I have the cam cover pushing out a lot of air. Like a vacuum on backwards.. What can I do with this breather pipe? Its not blowing out oil or anything but it makes the car cabin smell of fumes.

    I've consider a catch can with a small filter on it and another exit going back into the pod filter

    Any help, pictures, advice is wholesomely appreciated.


  2. #2
    Veteran trikzlane's Avatar
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    just run it into a catch can with a filter, otherwise you can pumb it back, its up 2 you
    ~KEEP DRIFTING FUN~

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    Moderator Sam-Q's Avatar
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    you can never block off the breather to an engine, it will cause it to not breathe and hence not have high pressures. What you propose sounds ideal.
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

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    Veteran haveaparty's Avatar
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    How bout u put the breather pipe back on. Mine has a oil breather in the line.

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    Moderator Sam-Q's Avatar
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    Now I have not paid attention to what is normal on boosted engines but I would think that putting it pre-turbo would get the best ring seal.
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

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  6. #6

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    OK Thanks a lot. I'lll fit a catch tank to it with the filter

    I went to a wreckers last week and picked up a honda break cyclinder ( one way ) valve. Hoping that when the plenum was under pressure the valve would stop the pressure going into the cam covers. but not under load let the rocker covers blow back into the plenum. This theory didnt work and resulted in a lot of SMOKE!! out the back

    Thanks a lot people

  7. #7
    Moderator Sam-Q's Avatar
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    the reason why your engine smokes is because the crankcase pressure grows to a point where the combustion pressure isn't enough to push the rings outwards to seal properly.
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

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    Veteran lolwat's Avatar
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    point it straight at the ground

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    Veteran FAST EDDIE's Avatar
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    if ur going to run lots of boost you NEEd to have a breather on both rocker covers and you need to have a big breather (bigger thatn the std one)or it will just overfill the rockercovers with oil and spew it out the breather, ive also done the aim it straight out to the ground but this was in a street car with 12psi so never got too much of a hard time!
    AE86 THE BEST

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    Veteran johl's Avatar
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    Do you need to block the inlet breather or does it not leak boost? Pretty sure i'v seen heaps of people run lines from cam covers and inlet to a catch can with a filter on it but I always wondered whether the compressed air would escape from the inlet manifold
    stroked 2L ca18-ae86 in the build...eta xmas 2012?

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