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Thread: crankcase ventilation

  1. #1
    Moderator RACING JUNKIE Harbone's Avatar
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    crankcase ventilation

    The car I just purchased has a healthy 454 and I think the previous owner was going to make it more drag than street. My intention is all street. He installed valve cover breathers with hoses running down the inner fenders like he was going to hook them to the headers for evacuation but never did. Am I better off just putting some regular breathers on the car or put a oil fill cap on one side and install a PCV valve on the other side? Should it be hooked to the carb if I do or directly to the intake?
    Chris

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  2. #2
    Senior Member RACING JUNKIE
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    Since the car has mufflers, he couldn't hook them to the headers, I would opt for the vented filler and a PVC oposite side, carb or maniflod doesn't matter, which ever looks cleaner.

    JMO

    Zip.

  3. #3
    Senior Member EXPERT BUILDER gearhead1011's Avatar
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    If you go with the PCV valve and you're going to hook it to the intake make sure it's at the base of the carb and not on a runner.

  4. #4
    Moderator RACING JUNKIE Harbone's Avatar
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    Thanks guys!
    Chris

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  5. #5
    Moderator RACING JUNKIE Harbone's Avatar
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    Quote Originally Posted by zipper06
    Since the car has mufflers, he couldn't hook them to the headers, I would opt for the vented filler and a PVC oposite side, carb or maniflod doesn't matter, which ever looks cleaner.

    JMO

    Zip.
    Zip,
    Would I want a "vented" filler? I think that would cause a huge loss of vacuum. This motor runs a 585/585 lift solid roller cam and probably doesnt have much for vacuum anyways.
    Chris

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    Senior Member RACING JUNKIE BEAST477's Avatar
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    Hey Chris, do you need much vaucum? I see it has manual brakes. Is there still a vaucum modulator on the trans?
    BEAST477






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  7. #7
    Senior Member RACING JUNKIE
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    Chris, look at it this way, Brian was running 2 open vents into hoses. All you need to do is keep the pressure from building up in the carankcase and valve covers to keep it from blowing oil out of the valve covers at high RPM's. This will not effect your vacuum since that all comes from the intake part of the engine. The PVC valve may hardly ever open except at high RPM since they are designed to only open when there is a build up of pressure in the crankcase, which is created by blow by in the rings.

    Zip.

  8. #8
    Moderator RACING JUNKIE Harbone's Avatar
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    Quote Originally Posted by BEAST477
    Hey Chris, do you need much vaucum? I see it has manual brakes. Is there still a vaucum modulator on the trans?
    Beast there is a vacuum modulator on the trans


    Zip that answers my question then, I am gonna change it over to the PCV setup this week.

    Thanks for all the input guys, I cant wait to get all the changes done to the car and take her cruising in the spring! I might even have to take her to the track, its been about 4 years since I have been racing.
    Chris

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  9. #9
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    Bone, any road racing tracks nearby that host 'Track Day' events ?
    How 'bout auto crossing ?
    Those 2nd gen 'maros do pretty well in those type events. Also a lot easier on drive train components and is a TON of FUN !
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  10. #10
    Moderator RACING JUNKIE Harbone's Avatar
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    DD,
    There is a track I believe up by the Joliet dragstrip. The car has a the big front swaybar and the stock one on the rear. I installed the full Hotchkiss setup on my last car and it made a world of difference.
    Chris

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