[Question] Pcv valve
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Pcv valve

  1. #1
    1989 Caliber 1
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    Default Pcv valve

    Hello All,

    I was just wondering if I need to run a pcv on my open engine jet boat. Right now I have two Summit Racing breathers with the filter elements. I was told that the blow by coming out of the breathers could start a fire and that I should have a pcv valve on one of the valve covers and a breather on the other. Could someone enlighten me on this? Thank you.
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  3. #2
    AKA OhOneWS6 Last Mohican's Avatar
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    PCV valve only works at idle. I put header evacs on mine and my oil problems were totally resolved. You could also use a vacuum pump setup.

  4. #3
    tintingsandiego krusn56's Avatar
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    I run one but have an enclosed engine.
    Made In The Shade

    Custom Window Tinting

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  6. #4
    Pink Taco Reagan's Avatar
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    X2 on the header evacs

  7. #5
    Senior Member jetboatperformance's Avatar
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    excessive smoke and oil vapor from breathers is an indicater of "crank case blow by" (compression/combustion) passing back into the crankcase for a multitude of possible reasons (worn rings, worn cylinders, pistons incorrect clearances etc) , some very minor smoke or vapor is normal especially when the engines cold , alot is not ,a PCV on one bank drafting thru a breather on the other will help control it a bit you could also consider a Puke tank setup with both breathers directed to it or even pan vacs (header "drafted" breathers) You might want to perform a wet/dry compression test and (if available) a cylinder leak down test to check the health of your engine Tom

  8. #6
    Senior Member ICECREAMAN's Avatar
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    A pcv valve can't hurt anything, it recirculates the gasses from the cranckcase back into the combustion chamber to re-burn them. It also keeps the pressure from building up in the crankcase so you don't blow oil out through the dip stick or valve cover vent. The valve is working any time the engine is under a vacuum and doesn't rob or require any power from the engine to operate. As far as the gasses being flammable, if it's an open engine compartment with a reasonably sound motor it would be almost impossible to ignite them. Under a hatch may be a different story as fumes could accumulate to the point of being explosive. So, the short answer is, if you like what you have leave it alone. If you are blowing oily residue on your engine, then try a pcv valve and see if it helps. That's my thoughts anyway.

  9. #7
    The Good mrjoshua's Avatar
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    Can anybody recommend a good evac valve? Twice this year i "fogged" my rockers with moisture back thru the evacs from the headers. Once with the old evacs and once with the new ones. I had the pressure control set up correctly for the inlet lines and did not have any water below in the pan, just white crap on the rockers. The second set would not allow you to blow through them cold, but i was wondering once they got hot did the valve began to fail?

  10. #8
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by mrjoshua View Post
    Can anybody recommend a good evac valve? Twice this year i "fogged" my rockers with moisture back thru the evacs from the headers. Once with the old evacs and once with the new ones. I had the pressure control set up correctly for the inlet lines and did not have any water below in the pan, just white crap on the rockers. The second set would not allow you to blow through them cold, but i was wondering once they got hot did the valve began to fail?
    I'll get you the PN I get them from Napa (70's 80's Auto air injection smog systems)

  11. #9
    Senior Member rpm0414's Avatar
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    If you want header evac just use a moroso kit. They work ok

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