Final Drive, Final Warning - BMW Luxury Touring Community
 
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post #1 of 13 Old Jan 16th, 2009, 11:32 pm Thread Starter
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Smile Final Drive, Final Warning

First, thanks to CharlieVT for his opinions on the FD and what happens inside during failure.

My chip detector is complete and installed. I will post instructions and parts vendors later if there is interest in what I have done.
Included are photos of the detector with and without the guard for the magnet. This guard is necessary to keep the externally mounted magnet electrically isolated from the oil plug when ferrous debris sticks to it. The original design was for the magnet to be internal but there is insufficient clearance in the FD. Another photo is of the wiring below the rear seat. The warning light (LED) is connected to the heated clothing plug which is switched with the radio. From there the wire terminates at the chip detector. Please note the addition of the ground wire visible above the detector. It terminates on the frame through a seat latch mounting bolt and the blue terminal is visible in the photo of the under-seat wiring. This was necessary as the FD case is not grounded to the frame of the cycle. While the photo does not do it justice, the LED is very bright and will be easily visible in the rear-view mirror. Initially I intended to mount a warning horn but now I don't think it is necessary. My hope is that by keeping the original magnetic drain plug in place the "normal" fuzzies will collect around it and the detector will only be triggered by an amount sufficient to overload the bottom plug. Such would be the case when the bearing cage begins to fail. I'm pretty sure this design will work. Hopefully I'll never know for certain. If nothing else, I think it's pretty cool looking.
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Last edited by deanwoolsey; Jan 17th, 2009 at 1:08 am.
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post #2 of 13 Old Jan 16th, 2009, 11:47 pm
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Re: Final Drive, Final Warning

nicely done!


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post #3 of 13 Old Jan 17th, 2009, 12:14 am
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Re: Final Drive, Final Warning

I agree - nicely done, indeed! I'd like to see the parts list and further description, so you've got one vote from an appreciative member!
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post #4 of 13 Old Jan 17th, 2009, 8:06 am
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Re: Final Drive, Final Warning

Very clever!

Wow, talk about quality wire... that's REALLY good stuff.

I think a klaxon

http://www.youtube.com/watch?v=dByjdhWMBGQ

and strobe would be a lot more fun than a red light.

...and to think someone here was just bitching a few days ago about how no one ever comes up with any cool mods anymore.


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post #5 of 13 Old Jan 17th, 2009, 8:51 am
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Re: Final Drive, Final Warning

I'm impressed!
Excellent


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post #6 of 13 Old Jan 17th, 2009, 10:07 am
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Re: Final Drive, Final Warning

Great job. Really nicely done!

I too would like to see a parts list and understand what size chip it will detect.

Again I think a great job

BMW may want to buy that from you and either use it, or put it on a shelf so they can keep their heads stuck in the sand on this, and other issues.

May I suggest you send it to BMWON Magazine and any other so they may shame BMW into seeing what people driving their bikes are doing to get some type of warning system on their EFD (Exploding Final Drive)

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post #7 of 13 Old Jan 17th, 2009, 10:26 am
 
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Re: Final Drive, Final Warning

Great idea! My only concern is that when mine failed, there really was not that much volume of debris on the magnet. But the several pieces that were there were pretty big. Hard to tell from the picture of the device, but I would suggest reducing the gap on the contacts to make the sensor more "sensitive".

Once the dealer replaced my entire drive with a new factory unit, he almost demanded that I run the Redline shockproof Heavy in there. After 25K miles on the drive, I've never seen more than a tiny amount of grey smudge on the magnet when I changed it during the 5K oil/filter interval.

So if you run the shockproof and run your detector with a minimal gap, it should be a great breakdown prevention combo.
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post #8 of 13 Old Jan 17th, 2009, 11:37 am
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Re: Final Drive, Final Warning

THAT is clever indeed. I can see why that would be usefull on helicopters.
I for one have concluded this site is full.. of.. creative minds (trying to formulate the thoughts into words here now- not bad really) that never seem to impress me..

You really should apply for a applications patent here before BMW does.. and they probably will but ... oops forgot to install this particular item into every final drive.. well cept maybe the ones that are in the motorcycle shows.. Gotta look good , ya know?


My hat off to you again... maybe the BMW NOBEL PIECE ( yeh i did mispell it on purpose) prize


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post #9 of 13 Old Jan 17th, 2009, 1:08 pm
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Re: Final Drive, Final Warning

Dean,
That is a very clever idea and professionally done install. Hopefully, that light never comes on!

Life happens...you control your reaction.

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post #10 of 13 Old Jan 17th, 2009, 1:36 pm
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Re: Final Drive, Final Warning

I hope you patented it and license the technology to BMW


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post #11 of 13 Old Jan 17th, 2009, 2:54 pm Thread Starter
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Re: Final Drive, Final Warning

Here's the drawing for anyone who wants to build their own. As you can see it's been awhile since drafting class.
A couple of notes. I left the sensor gap large intentionally as the magnetic pull induced by the rare earth magnet is stronger than the original drain plug. I was concerned that normal fuzzies would give too many false alarms. If I do see signs of failure without an alarm I'll move the detector to the drain hole next time, but for now I figure it's easily removable and cleanable in case of those false alarms. Hopefully I'll never know if it really works but I will post again with any developments. For now though there's snow on the roads and it's only been tested on the center stand. Thanks to everyone for the comments and suggestions.

P.S. The drawing is not scaled.

LED Lamp #171KA
Note: the black lead is the positive.
http://www.foxtaillights.com/171-pir...marker-li.html
Drain Plug #1015
http://www.cgenterprises.com/drain_plugs_metric.htm
Magnet #DH250D
http://www.amazingmagnets.com/index....Category=25600
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Last edited by deanwoolsey; Jan 17th, 2009 at 3:03 pm.
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post #12 of 13 Old Jan 17th, 2009, 3:03 pm
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Re: Final Drive, Final Warning

I'm sure similar devices have already been patented...

This is only an application of technology that already exists in other fields.

As has been said.. Aircraft have had similar devices for a long time...

I'm sure Boeing or GE or somebody has the patent on that already..

But, hopefully this will work... At least to some degree... Probably going to be a "Your final drive has just failed" warning though...

Might not give you adequate warning if you're out in the middle of nowhere..

I'm very interested in seeing what happens with it...

Well done..

John

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post #13 of 13 Old Jan 17th, 2009, 3:08 pm Thread Starter
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Re: Final Drive, Final Warning

Thanks again to everyone. My goal was to provide a warning not so much for prevention but to minimize the damages, hopefully saving the very expensive gear set. If it does that, I'm a happy man.


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