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Thread: How To Setup Your Catch Can Correctly

  1. #1
    I <3 Purpul Shocker
    Si Speed 317's Avatar
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    How To Setup Your Catch Can Correctly

    This has always been a hot topic of discussion, hopefully this will make everything clear and simple.

    A 'catch can' is essentially just a can that catches any blow-by oil from your PCV (Positive Crankcase Ventilation) and VC (Valve Cover) ports. In our case, we want a ventilated catch can. A stock K20 motor's PCV valve is just that - a valve. It's actually a check valve. It's made to allow ventilation when your motor is in vacuum. When your motor sees boost (through forced induction, of course) this valve will close, preventing any ventilation from your PCV valve. We want this to be open during both vacuum and boost, so that we can get our blow-by to see our catch can instead of the inside of our motor/charge pipes/turbo. We are also going to route our VC ventilation port to the catch can. Here is how we setup our catch cans:



    PCV Valve, #1. Remove the vacuum hose and this valve. Punch or drill out the guts. Cap off your IM (intake manifold) port, #4, and secure with a small zip tie. Reinstall PCV valve, and connect this to the port on the catch can, #3. Now, your VC breather, #2 needs to be connected to the other port on your catch can, #3. The only thing you need to figure out on your own is where to mount your catch can. Be sure to secure any smaller vacuum lines with a zip tie.

    Hope this clears things up! Feel free to rep me, bottom left of my post


    Also, I forgot to add that adding steel wool to the inside of your catch can helps separate the oil from the air. Definitely a good idea to add
    Last edited by Si Speed 317; 04-11-2011 at 01:02 AM.

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  4. #2
    Newbie Yoklus's Avatar
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    Good info for boosted ppl.

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    Premium Member boosted_teg's Avatar
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    could you just put a small filter on the valve cover and a filter on the check valve (when drilled out)?


    If you place two 10an bungs on the back of the valve cover, cap the check valve and run the lines to a catchcan, that would essentially work.

    we placed a catchcan where the battery use to be, two lines to the valve cover, and two lnes to the oil pan (releave pressure there also)



    The bottom two lines were capped for the photos, we didnt have enough time to createthe lines for the car show
    Last edited by boosted_teg; 04-11-2011 at 10:11 AM.

  6. #4
    I <3 Purpul Shocker
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    Quote Originally Posted by boosted_teg View Post
    could you just put a small filter on the valve cover and a filter on the check valve (when drilled out)?
    You could, but this is about being environmentally safe and doing things properly. Many people have done it, but you have to constantly keep cleaning the air filter, and whatever the excess drips on. Much better off just running a catch can, plus you can see everything that comes out

  7. #5
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    PetefromtheStreets's Avatar
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    How about ppl post pics of their catch cans.


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    i should probably get on this, especially considering i have one sitting in my closet haha

  9. #7
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    Quote Originally Posted by highspeedsi View Post
    i should probably get on this, especially considering i have one sitting in my closet haha
    Lol. I gotta have one made.


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    I <3 Purpul Shocker
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    Yea, everyone should post up their setups. Lets get some activity in here

  11. #9
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    Quote Originally Posted by Si Speed 317 View Post
    Yea, everyone should post up their setups. Lets get some activity in here
    Once mine is made I'll post it up.


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  12. #10
    I <3 Purpul Shocker
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    Awesome. Know how you're going to do it and what can you're going to use?

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