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Thread: pcv valve

  1. #1
    Senior Member MASTER BUILDER
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    pcv valve

    im going to use a pcv valve setup on my 408 sbc. is there a real good one for hi-po engines, or are they all the same. thanks for advice art

  2. #2
    Senior Member DYNO OPERATOR
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    Street engine or a racing engine?

    Race engines do not use PCV valves. Oily air drawn in the intake from the crankcase in a racing engine is a bad thing and does not provide any crankcase vent at WOT when you need it the most for ring seal etc. Use a header evac vent or two large breathers, one on each valve cover would be better than a PCV in a racing engine.
    If you are a street engine application then use a PCV with the highest spring pressure and smallest hole or restrict the hose inner diameter to prevent drawing in too much air volume, use a large breather on the opposite valve cover for street applications.
    Bruce

  3. #3
    Senior Member MASTER BUILDER
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    pcv

    thanksa bruce. it is a street engine and i will need to use the pcv setup. any idea how i could locate the pcv you described (heaviest spring and smallest hole).any certian cars that you know of would call for a pcv like this one. just out of curiosity, why the heaviest spring and smallest hole? thanks art

  4. #4
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    At least you didn't say PVC valve. lol

  5. #5
    Senior Member MASTER BUILDER
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    pcv or pvc

    hey rabbit i always make myself say pos crank vent before i write the initials pcv, or else a will write pvc, which i used to do all the time art

  6. #6
    Senior Member RACING JUNKIE
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    Re: pcv or pvc

    Quote Originally Posted by chevyart
    hey rabbit i always make myself say pos crank vent before i write the initials pcv, or else a will write pvc, which i used to do all the time art

    So true!!!!!! It's like I was a plumber in my past life or something... comes out of my mouth pvc every time no matter what.
    "I would walk through hell on Sunday before I fear the enemy"

  7. #7
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    Re: pcv or pvc

    Quote Originally Posted by Rigsby
    Quote Originally Posted by chevyart
    hey rabbit i always make myself say pos crank vent before i write the initials pcv, or else a will write pvc, which i used to do all the time art

    So true!!!!!! It's like I was a plumber in my past life or something... comes out of my mouth pvc every time no matter what.
    We've all done it quit a few times I'm sure. No matter how many times I hear it I still laugh.

  8. #8
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    Positively Ventilated Crankcase
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  9. #9
    If you got long tube headers and good flowing exhaust setup use a crankcase evacuation kit or turn a smog pump into a crankcase vacuum or just stick some breathers on your valve covers. Contaminating your intake charge with hot blow by is just disgusting. And creating a vacuum in your crankcase lets them rings seal better lowering blow by and reduces the air resistance that the oil slinging off the crank loves to grab ahold of.


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