WARNING!!! Catch can fail - Page 2
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Thread: WARNING!!! Catch can fail

  1. #11
    titan2782 is offline [OP]
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    Quote Originally Posted by Hoon View Post
    With some of the new cars the PCV valve is seamlessly integrated into the hose. I haven't looked at the Cruze system (although i should).
    If it is, it would be on the tubro side. I didn't look close enough at that end but I'm pretty sure it's open. When I ordered my new PCV pipe, the guy made no mention of a valve and asked if the car even had one (the part isn't listed as a PCV pipe, thats what the service manual calls it though). It's called a charged air bypass tube and includes the "PCV pipe" and the vacuum line that goes to the BPV/BOV.
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  3. #12
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    There's a valve internally ingrated into the cam/valve cover.

    Otherwise, there would be positive pressure trying to force itself out through the normal intake for the PCV system.
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    Autocross Champion AutumnCruzeRS's Avatar
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    Im confused on the flow direction of hose. Seem to go to intake on turbo and intake on manifold so which way, they seem to both suck

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  6. #14
    titan2782 is offline [OP]
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    Quote Originally Posted by AutumnCruzeRS View Post
    Im confused on the flow direction of hose. Seem to go to intake on turbo and intake on manifold so which way, they seem to both suck
    It doesn't go to the intake manifold, it just looks like it does. It goes to the valve cover which would be where the valve is located if it has one at all. The flow is ALWAYS going to the turbo. Why would you send air back into the motor from a place other than the throttle body.
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  7. #15
    Autocross Champion AutumnCruzeRS's Avatar
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    Well at idle I removed hose and there was suction from the intake connection on manifold

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    Quote Originally Posted by AutumnCruzeRS View Post
    Well at idle I removed hose and there was suction from the intake connection on manifold
    Correct.

    UNTIL that turbo spools up and forces positive pressure through.

    Then the valve in the cover closes and vacuum is provided from the intake side of the turbo (the air box vent) in the Cruze.


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    titan2782 is offline [OP]
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    Quote Originally Posted by AutumnCruzeRS View Post
    Well at idle I removed hose and there was suction from the intake connection on manifold
    Yes, there should be suction on the intake. But that port isn't going into the intake. Think about it, there is no oil in the intake (unless your car is jacked).

    Having a suction would suggest that there is no PCV functionality and that port is used to simply equalize pressure vs relieving it. BUT, just because you got suction when you took the tube off doesn't mean it's actually sucking in. If there is a valve in the tube at the turbo end then the suction is just from the motor and the valve prevents anything from actually being sucked in. PCV's are 1-way valve going out of the motor.
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  10. #18
    Autocross Champion AutumnCruzeRS's Avatar
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    Ok I get it under boost it flows to turbo hence the oil residue I have at the turbo intake.

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    I am new to turbo engines. Do you need a Catch Can? I am not planning on doing anything other than driving my car.
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    titan2782 is offline [OP]
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    U dont NEED one but oil will find its way into your cylinders. Its a safety device. If you are tuned then it would be a good idea but i recommend waiting for me to work out the kinks.

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