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post #1 of 16 Old 03-21-2009, 09:58 PM Thread Starter
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Ok yall i need to know does the crank case vent blow out or suck in? I am pretty sure it ONLY blows out but does it suck air in at all? THanks KS

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post #2 of 16 Old 03-21-2009, 10:07 PM
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It just blows out.

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post #3 of 16 Old 03-22-2009, 07:44 AM
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It will suck air back in when the motor cools.

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post #4 of 16 Old 03-22-2009, 07:54 AM Thread Starter
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My reasoning for asking is i am wondering if i put a one way valve on the end of the crank case vent line would it hurt it? The one way valve would let air out but it wouldnt let air or mud or water in. This is incase i flip it in a mud race, it wont let mud and water get in the crank case and destroy my bottom end.

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post #5 of 16 Old 03-22-2009, 07:56 AM
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it has to suck in sometimes, otherwise relocating it from the bottom of the air box wouldn't matter. typically when the motor is running, it's always blowing. but there has to be circumstances that it sucks in, since that's how most people get water in the bottom of their motors.

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post #6 of 16 Old 03-22-2009, 08:01 AM
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kscowboy wrote:
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My reasoning for asking is i am wondering if i put a one way valve on the end of the crank case vent line would it hurt it? The one way valve would let air out but it wouldnt let air or mud or water in. This is incase i flip it in a mud race, it wont let mud and water get in the crank case and destroy my bottom end.
i remember seeing a one way motorcycle valve for that application. it makes sense to use one. if it tries to suck with a one way valve, i don't think it can hurt anything.

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post #7 of 16 Old 03-22-2009, 08:09 AM Thread Starter
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Thats what i was wondering. Even if it tries to suck in a little i dont think it would hurt anything but i dont know for sure thats why i was asking.

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they wouldn't make the one way valves for them if they hurt anything. iirc, the one i saw was about $60 and metal construction. i just routed a hose and coiled it in my airbox and put a filter on the end.

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post #9 of 16 Old 03-22-2009, 10:48 AM
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crankcase vent hose...more like crank case breather...in and out, yes while running it will blow more out from engine blow-by, but it needs to breath in aswell....if you go cruiseng down a trail and the dive right into a mud/water hole the is 2' deep and get stuck....your hot engine is going to cool dramatically and istantly from the water that is surounding it....thus makeing the cooling the inside of the engine and pullig air back into it,,,,,,if you have the breather hose plugged off with a oneway, it will ten "suck" in from the next weekest point being the dipstick/engine seals/valve cover gaskets...the last thing you want on a 4 stroke is crank case "vacume" or presure....

basically.....it NEEDS to go both ways....

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post #10 of 16 Old 03-22-2009, 11:41 AM
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A Krankvent is what you are looking for. Creates a negative pressure in the case. Lots of Harley guys use them. Perfectly safe for a 4 stroke. Also will help keep water out if you sink it by closing off the breather hose. That's where the water gets in.

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