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so I didn't even realize these bikes had PCV systems until reading it on here the other day.. All I knew it that I was tired of my filter getting dirty so fast.
today I figured I'd try to set-up an external vent, I think I have the SE intake now, so I just bought some 7/32" vacuum hose & a t-joint, & routed the PCV under the tank, then under the seat & down behind the battery onto the ground. easy to do,
so it was interesting that this thing seems to be spitting out just water vapor so far,, pretty crazy that these things spit water back into the intake.
so I didn't even realize these bikes had PCV systems until reading it on here the other day, pretty crazy that these things spit water back into the intake.
it's just like throwing puke in through the injectors and on into the cumbustion chamber. That is some crazy ShYt right there.
so I didn't even realize these bikes had PCV systems until reading it on here the other day.. All I knew it that I was tired of my filter getting dirty so fast.
All newer cars do the same thing. The water doesn't hurt anything. Water is a normal by-product of combustion anyway. The idea with direct venting is mostly to keep oil mist out of the combustion chamber.
If your stock system is working properly, it shouldn't have anything to do your air filter getting dirty more quickly. The crankcase vapors don't go though the air filter, but are injected downstream.
Also, the stock Harley system isn't really a "positive crankcase ventilation" system, because it has no fresh air source to pull through the crankcase for ventilation. It simply dumps crankcase vapor to the carb/throttle body inlet.
I read an article somewhere online that the crankcase breather is what causes the filter to get dirty with motor oil,,
naturally moisture is a byproduct of combustion but if the breather is constantly spitting the water back into the intake then the water is going to accumulate in the oil.
interesting stuff, I read years ago about how this is bad for direct injection cars, so I do have a catch can on my car. it seems like a good idea just to keep the motor cleaner.
Yeah, it's particularly bad on the direct injection motors. The backside of the intake valve doesn't have any exposure to the gasoline detergents to keep it clean, and they can build up incredibly heavy deposits, enough to really choke off air flow.
I don't know if they've come up with a solution yet to that problem or not.
Why wait on "they" to come up with a solution to a problem "they" created? Just get yourself an external breather setup and stop puking back into your intake all the post combustion garbage. If memory serves here, the invention of unleaded fuel was caused by the creation of the catalytic converter.....a solution "they" created to a problem "they"created." They=you know....
Yeah, it's particularly bad on the direct injection motors. The backside of the intake valve doesn't have any exposure to the gasoline detergents to keep it clean, and they can build up incredibly heavy deposits, enough to really choke off air flow.
I don't know if they've come up with a solution yet to that problem or not.
I've read articles that GM has done solutions and is confident in them, the direct injection cars that really had big problems were the early audi's & bmw's.. Still I don't trust any of it, I think it's better to keep it out of the car with a catch can. I don't know much about motorcycles, yeah a little water shooting into the intake probably won't hurt, it will just get burnt up & exhausted, but I think getting any water out of motor you can is a good thing.
Last edited by LunaticFringe; Apr 12, 2015 at 10:44 AM.
Why wait on "they" to come up with a solution to a problem "they" created? Just get yourself an external breather setup and stop puking back into your intake all the post combustion garbage. If memory serves here, the invention of unleaded fuel was caused by the creation of the catalytic converter.....a solution "they" created to a problem "they"created." They=you know....
That's it! You, all of you , you've pushed me to the edge!! I'm going to do it!!!
Besides the negative effects of the hot oily air going back into the air cleaner & combustion chambers, that air is also oxygen depleted. The main reason for air going into the combustion chamber is so that the oxygen will mix with the gasoline and combust. Keeping that oxygen depleted air our of the engine (by venting externally) is also a performance booster.
Check out the variety of external venting methods HERE.
You'll also see some Dyno Charts showing performance increase.
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You, all of you 
