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PCV/Catch Can/Crank Pressure

This is a discussion on PCV/Catch Can/Crank Pressure within the GTO forums, part of the Vehicle Specific category; yup the valve is along the passenger side. I'm not a home for 2 months so I can't get any ...

  1. #341
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    yup the valve is along the passenger side. I'm not a home for 2 months so I can't get any pictures or anything. Lets say for right now i'm going to keep the original valley.

  2. #342
    Grand Imperial Wizard Sarge's Avatar
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    Ask up in the FBody section.

  3. #343
    Senior Member tatertot91's Avatar
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    Quote Originally Posted by GOR1LA View Post
    yup the valve is along the passenger side. I'm not a home for 2 months so I can't get any pictures or anything. Lets say for right now i'm going to keep the original valley.
    If you're keeping the stock valley run the hose along side the engine into a catch can, on the other end of the catch. Can run it to your intake manifold with a pcv valve in between. Cap off the drivers side valve cover and run a breather. That is how I was going to do it on my 98.

  4. #344
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    what would happen if you ran your pvc to the catch can but didnt put a return line back into the intake and just capped it off at the intake?

  5. #345
    Grand Imperial Wizard Sarge's Avatar
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    Where are you proposing you vent the pressure to?

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    Quote Originally Posted by Sarge View Post
    Where are you proposing you vent the pressure to?
    lol cmon we all know where...just vent that shit outside... not that i did, cousin has a 20det and he didnt return it to the intake, just wondering if that would have any effects on the motor?

  7. #347
    Grand Imperial Wizard Sarge's Avatar
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    You gain nothing doing it that way. I vent to the atmosphere from both valve covers so I am not asking you from a tree hugger percpective...... route the valley tray through the CC to the TB...

  8. #348
    Junior Member darrenct's Avatar
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    hey sarge... what if you just route an in line type filter or pcv valve instead of using a catch can to the TB? (i have an ls2 GTO)... is there any issues with this setup?

    thnx

  9. #349
    Senior Member tatertot91's Avatar
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    ^that's a little confusing
    The tb only provides air to the system, you're much better off with a catch can. An inline filter wouldn't do nearly as good a job

  10. #350
    Junior Member darrenct's Avatar
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    ok, thnx for the info!

  11. #351
    Member JAX04's Avatar
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    PBM 366ci TC78 E85
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    Sarge, how do you feel about exhaust scavenging?? Im going to give it a go on my new setup, it makes sense that would it would only pull more vacuum as exhaust speed increases.

    Im going to atleast try it, but would you recomend using a catch can between the valve covers and the exhaust??

    also, would you recomend pulling from the valve cover as well with this type setup.

    the kit i ordered from moroso came with two nipples and two check valves. so i was thinking tying the two valve covers to one nipple and the valley to its own. it would always be under vacuum even under boost. do you feel like this is a good option??

  12. #352
    Grand Imperial Wizard Sarge's Avatar
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    I did that back in the day
    No catch can required.
    You got it right. It will pull like a bitch...you will rev faster.

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    PBM 366ci TC78 E85
    2004 Pontiac GTO PBM A4

    Quote Originally Posted by Sarge View Post
    I did that back in the day
    No catch can required.
    You got it right. It will pull like a bitch...you will rev faster.
    Very cool sarge, Im not sure why more people dont do it, it seems like an amazing thing.

    we shall see

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    Quote Originally Posted by JAX04 View Post
    Very cool sarge, Im not sure why more people dont do it, it seems like an amazing thing.

    we shall see
    hey can you post a link to that kit pls?

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    PBM 366ci TC78 E85
    2004 Pontiac GTO PBM A4

    no problem, Hope its allowed on this site, its from summit.

    http://www.summitracing.com/parts/MOR-25900/

  16. #356
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    So how does that get installed?

  17. #357
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    Quote Originally Posted by GOR1LA View Post
    So how does that get installed?
    do you have a ls1? because we only have one side we can put a beather on

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    yup ls1 for me!

  19. #359
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    PBM 366ci TC78 E85
    2004 Pontiac GTO PBM A4

    you can download the pdf instructions right there, simply put the provided bung into your exhaust stream after your headers, at a 45* angle, and hook up the supplied stuff,

    I got mine installed into my downpipe last night, not much at idle, but when he revved it up free revving, it def had some suction to it, so i devised a twin check valve system to between the manifold and valley, this way even at Idle, i will always have vacuum on the valley.

    Pretty simple, the moroso bungs/nipples have built in check valves, so i only needed one on the manifold and one on the valley, piece of cake, under boost, it will have the exhaust vac, and under light throttle it will have manifold

  20. #360
    Member Texas Jack's Avatar
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    Quote Originally Posted by JAX04 View Post
    Sarge, how do you feel about exhaust scavenging?? Im going to give it a go on my new setup, it makes sense that would it would only pull more vacuum as exhaust speed increases.

    Im going to atleast try it, but would you recomend using a catch can between the valve covers and the exhaust??

    also, would you recomend pulling from the valve cover as well with this type setup.

    the kit i ordered from moroso came with two nipples and two check valves. so i was thinking tying the two valve covers to one nipple and the valley to its own. it would always be under vacuum even under boost. do you feel like this is a good option??
    That is a cool system, learned something new and how simple it is. Thanks, Jax!!

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