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Old 07-08-2011, 03:24 PM   #1
Max Wedge OP
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Question Final Drive Vent for 2011?

I heard a rumor that the final drives in all the 2011 bikes have a vent in them. Anybody else hear this? Any pics around? Search for me revealed nothing.
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Old 07-08-2011, 03:34 PM   #2
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Originally Posted by Max Wedge View Post
I heard a rumor that the final drives in all the 2011 bikes have a vent in them. Anybody else hear this? Any pics around? Search for me revealed nothing.

The vents were started in the production month of April ,2010.
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Old 07-09-2011, 04:36 AM   #3
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The vents were started in the production month of April ,2010.
Maybe they got tired of replacing blown seals under warrenty?
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Old 07-09-2011, 06:20 AM   #4
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IMHO, they should have gone all the way and run a vent hose up into the bike to the height of the air intake. This is the only bullet-proof way to properly vent a gearbox and be certain not to suck water in at some point. If I were planning any serious deep water-mud riding, I would pull off this little gizmo and run my own hose.

I was surprised to see that before this, all BMW final drives had no vent at all. Look at every automotive axle, transfer case, transmission on the planet - they are all vented for a reason. It only takes a few psi positive to get lip seals to wear and a few negative to let them suck water in.
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Old 07-09-2011, 04:14 PM   #5
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So what does this vent look like? Where is it located? Anybody do a retro-fit?
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Old 07-10-2011, 04:13 AM   #6
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Originally Posted by Max Wedge View Post
So what does this vent look like? Where is it located? Anybody do a retro-fit?

My 2007 GSA has the new 2010 FD installed after losing the FD a second time in one month under warranty.
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Old 07-10-2011, 10:11 AM   #7
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Originally Posted by John Smallberries View Post
IMHO, they should have gone all the way and run a vent hose up into the bike to the height of the air intake. This is the only bullet-proof way to properly vent a gearbox and be certain not to suck water in at some point. If I were planning any serious deep water-mud riding, I would pull off this little gizmo and run my own hose.

I was surprised to see that before this, all BMW final drives had no vent at all. Look at every automotive axle, transfer case, transmission on the planet - they are all vented for a reason. It only takes a few psi positive to get lip seals to wear and a few negative to let them suck water in.
1150's and older all had vents on them, little black cap on top of the final drive. However riding a warm FD into a river can be an issue as it cools and tries to suck up water. Have seen folks pull the cap, install a bib and run a hose. There was an advantage to the R1200's initially that you didn't have to be concerned with sucking in contamination, however the ability to vent is more critical then keeping contaminants out evidently.
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Old 07-10-2011, 12:55 PM   #8
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Yup, looks like a good one. It would take submersion to get water in it. Not sure it is necessary, but time will tell.

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Old 07-11-2011, 11:09 AM   #9
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Submersion!



That's not me - but isn't this what our GS's are supposed to be capable of handling by design? That little rubber cap better have some clever technology inside to tolerate full submersion of a hot final drive.
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Old 07-11-2011, 01:28 PM   #10
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That's not me - but isn't this what our GS's are supposed to be capable of handling by design? That little rubber cap better have some clever technology inside to tolerate full submersion of a hot final drive.
If you are riding like that regularly I hope you change the oil often, in the motor, the trans and the FD.

I do not think that is within the normal design parameters of the bike, but hey, I could be wrong.

Jim
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Old 07-11-2011, 01:48 PM   #11
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That's not me - but isn't this what our GS's are supposed to be capable of handling by design? That little rubber cap better have some clever technology inside to tolerate full submersion of a hot final drive.
Here, official BMW promo.
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Old 07-11-2011, 02:42 PM   #12
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Hydrophobic screen? Similar to the ones used in auto headlamps maybe?
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Old 07-11-2011, 02:57 PM   #13
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Here, official BMW promo.
The official Buell website and promos used to show the bikes doing wheelies and stoppies and all sorts of other hooligan activities. Go ask the owners whom did those things what happened when they tried to get any warranty work performed when such activities were involved: "Oh sorry, they weren't meant to be used that way."
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Old 07-11-2011, 03:18 PM   #14
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Yup, looks like a good one. It would take submersion to get water in it. Not sure it is necessary, but time will tell.

Jim
Whats the count on re-designs on the final drive, 4?. Exciting to watch BMW move closer to getting it right. Maybe in the final year of production, we'll finally get a fill plug as useful as the last generations! Curious if the oil level is going back to 220ml on the 4Th generation drives?

bemiiten screwed with this post 07-11-2011 at 03:24 PM
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Old 07-11-2011, 04:30 PM   #15
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Whats the count on re-designs on the final drive, 4?. Exciting to watch BMW move closer to getting it right. Maybe in the final year of production, we'll finally get a fill plug as useful as the last generations! Curious if the oil level is going back to 220ml on the 4Th generation drives?
Here's my latest attempt at an extended 1150 vent after looking at all these pics today of submerged GSes:
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