instead of using a filter at the end of the crank case breather. they just connect it to the ais so the ais pulls the crank case air and injects that into the exhaust ports instead of the cold air from the air box. If you search the form there are a few how to for this. I prefer just to leave the crank case breather connected and just use smog block offs. The crank case vent line isnt that big of deal to me.

 

Wow, they did a number on that bike before you got it! :scared

You want the crank vent to go into the airbox. Pulling or venting from the crankcase is a good thing.

I've even heard that venting to the exhaust past the collector like on dragsters has shown increased HP. But wouldn't recommend that one to the faint of heart.

 

From what I've picked up theres some controversy over crankcase venting. I see that some people are running the krankvent but I haven't found much on messing with the AIS. An extra HP or two dosen't really mean that much to me at this point, I'd rather do whatever is better for my engine...

Having the AIS hooked up to the breather means that the crank will only be vented (or under vacuum) when the cut-off valve is open. Also, I'd imagine the amount of air being pulled from the crankcase into the exhaust would be much less than it would be from the intake, rendering the AIS almost useless. Since it's for smog purposes only, it's not really a concern to me.

Having a constant vacuum on the crankcase vent seems to be more important of an issue, as it seems to affect horsepower though...

 

The fun part is if you end up putting on a PCIII to tune the bike after mods you will end up blocking off the AIS ports at the exhaust side of the head.

 

on the krankvent mod. to have that neg pressure build up threw a one way valve. could this be bad for the motor. wouldnt that pressure just keep building up. cause of the one way valve only letting air outta the crankcase and not in. any info would be awesome

 

No need to let air in since when the motor is running there will always be positive pressure pushing air out.

 

That vent tube is not just for smog purpose it vents unburned gas back into the air box to be burn. So in other words your a venting gasoline vapors into the air wasting your money it may not seem that big but over time it will! AS far as drag cars making more HP its true but what is not said is they are running a crankcase vacuum pump. The air in the case cause drag removing it reduces the drag netting a few more HP.