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Thread: Crankcase evac

  1. #1
    Senior Member MASTER BUILDER
    Join Date
    Aug 2007
    Location
    Iowa - USA
    Posts
    218

    Crankcase evac

    Do I need a evac system on a bb chevy normally aspirated?

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Aug 2007
    Location
    Lost Creek, WV
    Posts
    533
    You need some type of evac on any engine. Wether you use a vacuum pump or header evac system or even a pcv valve the crank case has to be ventilated.

    TS1955

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    Location
    La.
    Posts
    2,890
    Kinda the rule of thumb, if you have mufflers you will need a PVC system, if you run open headers you will need a header evac or vacuum pump.

    JMO

    Zip.

  4. #4
    you cant run a header evac set up if your running mufflers?

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    Location
    La.
    Posts
    2,890
    Quote Originally Posted by billyd21970
    you cant run a header evac set up if your running mufflers?
    Nope, you'll get the biggest oildown on the engine that you have ever seen. If you are running all out/high RPM.
    Been there and done that.

    Zip.


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