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do i need a crankcase breather?

This is a discussion on do i need a crankcase breather? within the General Help forums, part of the LSx Technical Help Section category; this is a sketch of how i have my pcv attached. on the drivers side i have it coming from ...

  1. #1
    Member bobbyd's Avatar
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    do i need a crankcase breather?



    this is a sketch of how i have my pcv attached.

    on the drivers side i have it coming from the back of the valve cover to the catch can. the port which has the pcv valved attached.

    on the passenger side.
    the rear valve cover port is sealed.
    the front valve cover port is going to the back of the tb.

    catch can the other port on the catch can is going from there to the intake.

    i was just wondering if it was good that way or if i should add a breather to the oil cap to get fresh air into the crankcase?


    i have the stock ls1 valley.
    catch can is a revx.
    intake is a ls6

  2. #2
    Senior Member JayTA98's Avatar
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    1998 Trans Am

    i did put a small breather on the stock oil cap. I drilled a hole on top of it and put the breather on it. You know you don't need a breather. The way you connect everything is correct. i have mine the same way.

    I took it off because i started to smell burnt oil inside the car when the a/c was on. Frost warn me about that.

    here is how I made it:
    breather cap
    Last edited by JayTA98; 06-03-2011 at 05:36 PM.

  3. #3
    Member bobbyd's Avatar
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    thanks man. so i guess its a no go.

    also wanted to make sure if was connected correctly.

  4. #4
    Senior Member JayTA98's Avatar
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    Mean Black
    1998 Trans Am

    if you can post a pic of the can installed. If it is the cylindrical style the hose coming from the driver's side cover connects to the top of the can. The bottom outlet connects to the intake.

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    Senior Member tatertot91's Avatar
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    If you were to delete your yellow hose and cap off the valve cover then yes you would need it

  6. #6
    Member bobbyd's Avatar
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    sorry for the late responce.

    i went ahead and removed the catch can today to see how much oil it had collected in the last 3000-5000k or so.

    it did get some but not much.

    anyways i got some pictures and after looking at my diagram and the way i had it on the car it was different.

    http://i.imgur.com/tDDW5.jpg
    this is how much oil it had.

    http://i.imgur.com/5R9g5.jpg
    this is how i had it setup. i think its wrong right?

    http://i.imgur.com/LrigY.jpg
    this is basically like how it would be off of my diagram.

    but then again lets say i had it connected wrong then it wouldn't had trapped any oil right?

    sorry didnt add the [img] to the pics since they are big pics.

  7. #7
    Senior Member JayTA98's Avatar
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    The last image looks to me like the correct one. You won't have any issues but I believe that the input(where it comes from the PCV) has to go where the small filter is. Canisters are different so you have to look at it. The reason of the filter is to catch the particles of sprayed oil and let it drip in the canister while the air passes clean to the open output (to the TB).

  8. #8
    Member bobbyd's Avatar
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    Quote Originally Posted by JayTA98 View Post
    The last image looks to me like the correct one. You won't have any issues but I believe that the input(where it comes from the PCV) has to go where the small filter is. Canisters are different so you have to look at it. The reason of the filter is to catch the particles of sprayed oil and let it drip in the canister while the air passes clean to the open output (to the TB).
    yea thats what i was thinking that thats how it went since thats how i had it in my diagram. that little fitting is the internal pcv valve. the older rev catch cans had one port on the top and the other on side like many of the catch cans out there.

    i will just go ahead and leave it that way (like the last pic) and see if i notice
    a difference.
    the reason why all this got my attention is because lately i've been seeing little small leaks of oil. and since i saw that crankcase pressure can be the issue here.

    thanks for the help. i will report back on this in a few days or so to see how its doing. tomorrow im going to clean the bottom to remove the oil stains and see if my opsu is the culprit or possibly the oil filter. i dont think its the rear main or pan gasket since i see oil a little higher.

  9. #9
    Member Blue28's Avatar
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    I've got the same Catch-can (Revx.)You had it correct going in the middle/out the PCV to the intake.

  10. #10
    Member bobbyd's Avatar
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    Quote Originally Posted by Blue28 View Post
    I've got the same Catch-can (Revx.)You had it correct going in the middle/out the PCV to the intake.
    thanks man. i left it that way since if i blew on the pcv air wasnt going through.
    now you just basictly answered that it was correct the whole time

  11. #11
    Senior Member kingls1's Avatar
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    1999 Trans-Am, 2012 Sonic

    I went with the universal breather and catch can as stated above and worked out perfect, also had a ses light on for o2 sensor, after running it after install I could smell the cats, few rips on the gas and the ses light went off and has not come back on! I wonder if the clean air to the intake burned out any old oil left behind and cleaned up the o2 sensor? Any rate I very happy to lose the light

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