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What to do with the crank case vent tube? (Gen5 ABS)

3362 Views 37 Replies 7 Participants Last post by  mpp12, 
Mach.81
Any ideas how to deal with the crank case vent tube? (Gen 5 ABS)

The factory kit catch can isn't available for the ABS model. :frown2:

Has anyone come up with a simple solution?
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dricked
Vent it back to the valve cover.
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Mach.81
Sorry..I don't understand the theory on this.

That would be the same as capping it off.

The pressure needs to vent or there will be other issues.
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SkyDork
Mach.81 said:
Sorry..I don't understand the theory on this.

That would be the same as capping it off.

The pressure needs to vent or there will be other issues.
Click to expand...
Um, no. The air switching valve and reed valves in the valve cover offer a way to vent the PCV back out. So what Dricked is recommending is a very easy and valid way of accomplishing what you're after. Cap the airbox line, and route the PCV to the air switching valve that normally comes from the airbox. Done.

Or build a custom catch can.
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Mach.81
Yes that would be easy.

Block off plates installed!
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dricked
Mach.81 said:
Yes that would be easy.

Block off plates installed!
Click to expand...
Put the stock caps on that have the vent, connect them and put a "T" hose fitting in between and run the crank vent to the 3rd port on the "T".
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L
Taken from dricked's build thread, the photo shows how it's supposed to look on a Gen4. I don't imagine Gen5 is much different. I did this mod recently too but ran the hose around the other side of the motor without the 90 degree elbows so you have some options there. Be sure to plug the airbox. I bought the hose at a local auto store (winchester auto). I believe it was listed as a heater hose or something like that and they also had the T coupler.

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Mach.81
Nice..

My only issue with this method is the supply of oil filled air into the pair valve system and the possibility of contamination of sensors down stream in the exhaust...other than that looks like a good method.

I'll have to give it a little more thought on how to best tackle this crank vent line..for now I have it routed the same as you, up the right side, but mine is going out front to a small disposable container beside the forks.

And yes the air box is capped off;)

Thx for the insight..

>:)
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dricked
Mach.81 said:
Nice..

My only issue with this method is the supply of oil filled air into the pair valve system and the possibility of contamination of sensors down stream in the exhaust...other than that looks like a good method.

I'll have to give it a little more thought on how to best tackle this crank vent line..for now I have it routed the same as you, up the right side, but mine is going out front to a small disposable container beside the forks.

And yes the air box is capped off;)

Thx for the insight..

>:)
Click to expand...
The pair valve system is removed. The oil vapor is put back into the motor. If you get oil from your head into your exhaust system you've got some serious issues.
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dricked
Lanister said:
Taken from dricked's build thread, the photo shows how it's supposed to look on a Gen4. I don't imagine Gen5 is much different. I did this mod recently too but ran the hose around the other side of the motor without the 90 degree elbows so you have some options there. Be sure to plug the airbox. I bought the hose at a local auto store (winchester auto). I believe it was listed as a heater hose or something like that and they also had the T coupler.
Click to expand...
Thanks, I was too lazy to find the pic :)
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Mach.81
This setup pictured above pressure feeds oil filled (ccv) air into the exhaust.

Agreed...if you if you get oil from your head into your exhaust you either have a cracked head or blown head gasket.

Cheers
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dricked
Mach.81 said:
This setup pictured above pressure feeds oil filled (ccv) air into the exhaust.

Agreed...if you if you get oil from your head into your exhaust you either have a cracked head or blown head gasket.

Cheers
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No, it puts the air into the top of the head where your cams are. Would you like more pics? I have the valve cover off to set the valve clearances.
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Mach.81
No incorrect.

You are feeding ccv air though your valve cover through the reeds into your exhaust.

The reeds need cleaning once and a while due to "carbon buildup"

**Out of the service manual**

"If any carbon or other foreign particles have accumulated between the reed and the reed contact area, wash the valve assembly clean with a high flash-point solvent."
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dricked
You are incorrect.
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mpp12
you simply connect the hoses, I do not think you need to take out the reed valves.

this mood is supposed to give some hp, since the exhaust gases are sucking air out of the crankcase.

problem with this mood is that you cannot tune with this mood.
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Mach.81
Those ports/covers/block off plates we are talking about, feed air from the air box, or in your case from the ccv, into the valve cover, downward into the exhaust ports. These passages are from the valve cover to exhaust ports cast into the head.

This type of system was designed way back when they first started with emission standards.

Sorry for dating myself..

>:)
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dricked
mpp12 said:
you simply connect the hoses, I do not think you need to take out the reed valves.

this mood is supposed to give some hp, since the exhaust gases are sucking air out of the crankcase.

problem with this mood is that you cannot tune with this mood.
Click to expand...
You can tune just fine.

Mach.81 said:
Those ports/covers/block off plates we are talking about, feed air from the air box, or in your case from the ccv, into the valve cover, downward into the exhaust ports. These passages are from the valve cover to exhaust ports cast into the head.

This type of system was designed way back when they first started with emission standards.

Sorry for dating myself..

>:)
Click to expand...
Yep ok. So then what sensors in your exhaust are being affected by this new setup if you already have a way for oil to make its way into your exhaust system?

Figure out a catch can.
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tdh
Have to agree with Mach. The pair valve system takes air from the air box and feeds it directly into the exhaust. The passages happen to go through the valve cover and through the head but the CCV oil would end up in the exhaust, not in the chamber with the cams with that setup. What am I missing?
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Mach.81
I chose to use a catch can mounted beside the front forks:)

No oil is going into my exhaust.

Cheers
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tdh
Just curious, and I'm sure this is a stupid question, but what is wrong with the stock routing of the CCV to the airbox and then the airbox drain going to a catch can?
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