| Author | Message | ||
     Sweatmark |
I posted the following within another thread, but it's best addressed here: "Anybody have an idea why that transmission vent hose is so mondo huge? Interested in changing both the hose and its fitting as part of cylinder breather consolidation project, with installation of catch can." I'm trying to understand why the OE hose needs to be so large (I.D./O.D.) for an atmospheric venting application. My XB's an '03 model, in case the vent line has changed during successive model developments. Would like to change this vent line to something smaller overall without restricting vent function, and I intend to link the gearbox breather with crankcase breathers when I install a catch can. | ||
| Djkaplan |
If you link the tubing for the trans vent to the tubing for the breathers, it's entirely possible you could force water vapor and the oil/water emulsion called "spooge" that is vented from the engines crank and cam case into the transmission. Also, keep in mind the transmission will slowly suck ambient air and whatever else is in the vent line when the bike cools and air inside the primary/trans case becomes more dense. There isn't a reason for a catch can to be attached the trans vent line anyway. Nothing comes out except water vapor unless the crank seal has gone bad. In a case like that, a catch-can would just be a bandaide until the seal was fixed. | ||
| Sweatmark |
Understood re: the potential for contamination via the crankcase breathers. I was thinking about hose-barbed check valve used to prevent flow into the gearbox. What about a simple sintered breather for the gearbox, with suitable geometry to prevent water intrusion? This would replace the existing hose barb fitting and that monster vent hose. | ||
| Vagelis46 |
Does the gearbox need breathers. There is not air or any gases entering the gearbox, so what is the point ? | ||
| Djkaplan |
There is air in the transmission and primary. When it heats up, it expands and needs somewhere to go. It'll suck air back in when it cools down, too. Water will condense inside as a result of this heating and cooling. When the transmission heats up, water vapor is vented as well. Even transmissions (and differentials) for automobiles have vent lines. |
