Anyone else has put pod filters on a k1100?
Someone must had to deal with this issue before, i cant find any more info?
I’ll give it a shot, pay close attention and see if i get sludges in the throttle body.
From what i can see, it must be mostly fumes coming out of the crankcase beather hose.
Beeing mixted withe fuel/air mixture, i belive thath the system will compensate.
Anyway what do i know, îm just a basement moto mechanic triyng to undo what a bunch of verry well paid German engeineers worked hard to achieve! [ Invalid Attachment ]
Îll give it a shot, will keep posted next summer. I can always go back to the original aibox if all else fail.
I dug into this a little bit last night. You inspired me.
I actually ran my bike with the airbox and all breather hoses removed and observed air flow (BTW, it ran perfectly).
1. The rear breather hose had a steady stream of air venting from the crankcase.
2. All other hoses have no air movement at all. Both at idle, acceleration and holding RPMs. That indicates to me they are just returns for the positive pressure from the rear vent.
3. I noted that the hose running along the throttle body connects into the TBs BEFORE the butterfly valve. That indicates to me that it would never present a vacuum to the hoses that connect to it. It really is just an air re-circulation. As such, I really don't actually think it's necessary.
With that in mind, I have the following thoughts:
I would not put the rear crankcase breather directly to the TB hose like that picture. That is just asking for oil to enter the system. Either keep it with just a breather, or run a catch can. Putting just a breather does introduce the potential for some oil to leak out of the filter if it spits some out. I'd rather have it dripping/leaking than to have it enter the intake.
I'm planning on doing what you're doing. Just going to run a breather filter. If you look at pictures of the La Dini k1100, you can see that he also just has it venting to the side of the bike with a pod filter.
From the front crankcase hose, I did what you did and just jumped that over to the Y-fitting that is on the TB hose. I don't actually think any air flows FROM the front, so I don't think you'll ever get any oil spitting entering the TB (might want to monitor it, though). I also believe that you could probably plug it up, with zero consequence.