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Thread: Crankcase Ventilation

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    Crankcase Ventilation

    Lately I have been thinking should I install a simple belt driven vacuum pump where the ac unit normally sits that way I could create the desired 15" of vacuum in the crankcase under all conditions + more power maybe.



    http://www.lsxtv.com/forum/gz-motors...p-kit-194.html

    http://www.dragstuff.com/techarticles/vacuum-pumps.html.

    I wonder have anyone done it before is it worth a try ?

    I remember Import Power had electric one in his car back in 2005 or so what ever happened ?



    please share your thoughts.
    Last edited by mb7050; 03-13-2011 at 06:51 PM.

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    Runs on alcohol. The car does too. Not Verified Feedback Score 2 (100%) Intropy's Avatar
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    Quote Originally Posted by mb7050 View Post
    Once again Im thinkin how could I improve the stock crankcase ventilation system ?
    less oil contamination and no need to vent the crankcase back to intake is what matters most to me.
    Remove PCV, vent all 4 ports (draft tubes).

    Or, krank vents. Anything else is unnecessary.

    AEM s2 EMS | E316Gs | E85

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    Crankcase vacuum can have a positive effect on power. I think it is a very good idea. Only problem is that you may lose some power to operate the pump, but I'm pretty sure the positive increase in power would offset this. I don't recall exactly, but mabye something like 10-15 hp is possible. I once tried to use an electric smog pump to do this on my bmw, but it burned out quickly. There is another system that uses venturi effect in the exhaust to suck gasses out of the crankcase, but I think I read that this wasn't all that effective or had some sort of negative effect (I forgot). I do think some sort of electric pump would be the best way, but you would need one hell of a pump (powerful and rugged enough to withstand crankcase gasses).

    Bit of interesting reading I just goggled up quickly:
    http://nutterracingengines.com/racin...uum_facts.html

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    Quote Originally Posted by Intropy View Post
    Remove PCV, vent all 4 ports (draft tubes).

    Or, krank vents. Anything else is unnecessary.
    I think the stock pcv system works better than draft tubes (excluding high hp applications) in stock form (under 400hp) our pcv system vents the crankcase pretty well = less oil contamination but there is no vacuum in there never only air circulation.


    I had krank vents the bigger one failed
    positive pressure in the crankcase = bad = popped a dipstick = oil everywhere .
    When boosting krank vents do no good.They do create the desired vacuum in there but only when there is vacuum in the intake.


    If I get around installing the vacuum pump I would still want to have some air circulation in there like in stock form (pcv) and I "think" 15"-20" vacuum would be good .

    Last edited by mb7050; 02-25-2011 at 10:45 AM.

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    Quote Originally Posted by steve68 View Post
    Good motors don't pop dipsticks
    Good motors don't dribble at the filler cap.
    Good motors don't need the PCV system modifting.
    Good motors don't need krank vents.


    Steve
    If you run more that 18psi of boost I have noticed that stock pcv valve leaks ocassionally .

    and if you order this engine from mitsubishi it doesnt have pcv system on it, there must be a reason.
    Last edited by mb7050; 09-27-2010 at 06:49 AM.

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    Quote Originally Posted by steve68 View Post

    The best fix is to park it up and buy a cheap runabout until you can fix it properly rather to try a bandaid fix.

    Steve
    There is nothing wrong with my engine/car
    Last edited by mb7050; 09-27-2010 at 07:02 AM.

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    1st ever COTM and COTY verified Feedback Score 9 (100%) green-lantern's Avatar
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    Quote Originally Posted by Intropy View Post
    Remove PCV, vent all 4 ports (draft tubes).

    Or, krank vents. Anything else is unnecessary.
    I don’t really feel the stock system is very good. I’ve been thinking of doing this for a while. When under boost the valve closes and a lot of engines build up pressure in the crankcase causing pressure in the turbo oil return lines causing the turbo seal to leak. A guy I work with is an old school engine builder that owned a machine shop for years. They would build engines with custom rings that had less resistance and ran a vacuum pump like this. I believe something like this would not only prolong turbo life but engine life and improve performance. I have been thinking of tapping into the system somewhere and hooking up a pressure gauge to do some testing. I’m sure some engines could benefit more than others but I believe all would benefit some.
    Last edited by green-lantern; 09-27-2010 at 07:11 AM.

    Quote Originally Posted by HilbillyHomeboy View Post
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    Jeremy

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    I have run pressure gauge hooked to my crankcase since 2005

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    1st ever COTM and COTY verified Feedback Score 9 (100%) green-lantern's Avatar
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    Quote Originally Posted by mb7050 View Post
    I have run pressure gauge hooked to my crankcase since 2005
    We should talk I wish I would have done it on my old 10:1 engine and compared it with my new 8:1.

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    Quote Originally Posted by RL7 View Post
    There is another system that uses venturi effect in the exhaust to suck gasses out of the crankcase, but I think I read that this wasn't all that effective or had some sort of negative effect (I forgot).
    Exhaust slashcut evacuation

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