Crankcase vent hose - Kawasaki ZX-10R.net
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post #1 of 15 Old 12-21-2005, 09:25 PM Thread Starter
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Crankcase vent hose

Any benefit to plugging the airbox and running the crankcase vent hose directly to the KLEEN air valve for a bit of "vacuum assist" with crankcase pressure?

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post #2 of 15 Old 12-21-2005, 09:45 PM
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guess I get say it first, "do a search". Commonly know as the pair valve mod. ..or something like that.

I'm plugged my airbox, but am running a K&N crank case filter. KLEEN system blocked off too.

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post #3 of 15 Old 12-21-2005, 10:23 PM
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It would make sense to me to just remove the crankcase vent from the air box like miykl said. You will gain positive pressure in the airbox and you keep ram air pressure from entering your crankcase, thus letting your crankcase "breathe" better. I don't know if their is a check valve in the crankcase vent or not.

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post #4 of 15 Old 12-21-2005, 10:26 PM
 
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I've heard that a slightly pressurized crankcase improves piston ring sealing.
I was reading it in on of the picture captions for a Suzuki GP bike.

Last edited by JodyH; 12-21-2005 at 10:34 PM.
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post #5 of 15 Old 12-22-2005, 07:09 AM
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Pulling a vacuum on the crankcase will aid in ring sealing, but you are not going to see it with the KLEEN valve on the 10. It just does not pull enough of a vacuum to be able to do this.

Most race teams that do this, ie nascar, indy, and maybe the drag racers are using a dedicated vacuum pump plumbed thru the pcv syystem. I ahve yet to see a true vacuum system on any of the major bikes in any form of racing to do this yet.

I would much rather get rid of the extra crap and make the engine bay cleaner than deal with the crap from the KLEEN valve. Someone had a dyno graph with before and after runs with this mod and it does absolutely nothing for power on the 10.
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post #6 of 15 Old 12-22-2005, 09:32 AM
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I think I will have to agree that there will be almost no gains to doing this on the 10. I did this mod on my 12 back a few years back
while I was visiting the 12.org site and a few guys on there said it gained between one and two HP.
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post #7 of 15 Old 12-22-2005, 03:36 PM
 
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Yea, after I thought about my post above, I remembered the Suzuki GP bike had a vacuum line connected to the oil fill cap. For some reason I had pressurizing on the brain.
The Suzuki definately had a dedicated crankcase vacuum line.
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post #8 of 15 Old 12-22-2005, 07:37 PM
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NHRA Pro stock motorcyclyes use a dedicated vacuum pump and they pull somewhere around 20-30 in. of vacuum. I don't think the Kleen mod will make a difference but it don't hurt either. Here is a pic of the main pump that the NHRA PS Bikes use and just FWIW the pump is $2000 or was it $2200 but with the lightweight motor I know is $2700.







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post #9 of 15 Old 12-22-2005, 07:42 PM
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So aside form the vacuum pump idea, is there a benefit from sealing the airbox up? I don't mean the ram air, just the crankcase vent hole.

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post #10 of 15 Old 12-22-2005, 07:52 PM
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I dont think their is any real benefit except that the air isn't being put into the crankcase. I can only assume that the crankcase is supposed to vent into the airbox whereas to burn up the air from the crankcase (ie: fumes from unspent fuel and oil im guessing) This will be done for the emissions. I also will go as far to say that it will probably benefit from removing it from the airbox but if you go that far you may as well hook it to the Kleen ports on top of the valve cover. If you don't do that and just remove it from the airbox you do need to add a crankcase filter so it doesn't suck in dirt and grime from the road.

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