A wonderful sys tem that works well - but not well enough. The notion that oil mist would condensate due to contact with aluminum labyrinth walls was over stated in the initial design. This phenomena explains the slightly excessive oil use reported by many owners with early production run R1100's. So here it is - a brilliant solution that adds mechanical complexity but now offers us a advanced R1100 engine that has more potential for sustained high speed use while maintaining maximum power at top RPM's. No one I talked to knew how it worked so the following must be viewed as speculation and could be wrong as to how it works.
Holes also extend from the center hol e out to the end of each lobe tip.
The whole unit is now fitted on the lay shaft in front of the sprocket. A lip is machined on the front side of the large center hole in the impeller and this now fits and turns snugly in a new seal that is pressed int o the chain case cover. A large external line now runs from the front of the crank chain cover back up to the labyrinth chamber. Now here's where things get tricky - think of standing in the yard with a 12' garden hose that's open on both ends. This is known as pass ive circulation.