r26 rebuild to 12v with original BMW alternator 280W

[Misah]

hi,

For two years I bought an r26 in a reasonable, but not riding state.  After repairing an changing a lot of  minor and big  things to the original state , I drive a lot in the Netherlands and Belgium.

I build for myself and a friend a transistor ignition and bought also a electronic LIMA on ebay and everything works well. My exhaust was ruined with batteryfluid , ggggrrrrr. Always use a dry gel battery....

I read a article about the r27 that got a 12v original bmw alternator (for examble a later model r80 –r100 250-300W 3 fase). No adjustments has to  be made on the material and it works for the r27.

I got the plan to do this trick also on the R26, I understand that it will not fit standard.
It is easy to buy the expensive MZ-B ,but  "do it your self" when it is possible I like the best.
Did anyone build this ? the 3 fase Bosch BMW on a r26?? For the R27 there is a ring designed for mounting the alternator to the r26 body.  I'm interested if the mounting is possible on as reasonable way ..

I understand that the ignition with the mechanics will be replaced by a electronic one, that seems not be a problem because I know someone who built these complete for 110 EUR.
Regards,
Marty
The Netherlands

[Misah]

[rolf.soler]

....and what exactly do you plan to do with 300 W ?

[Misah]

Hi Rolf,
Only reliability on longer trips !, and maybe a little bit more light because of daily use. Everything is now working, for me it is a project for the coming winters. Only investigating 
Thanks,
Marty

[Tobi_R26]

Hi,

I use a 3-phase Bosch generator (BMW R80-100) combined with a Sachse electronic ignition on my R26.
See http://fred2001.de/Bilder/PA040040.JPG

It took me 3 generators due to the tricky alignment of rotor and the stator coil, but now everything is working fine.
(fingers crossed).

Best regards,

Tobi

--

[Misah]

hi toby


thats what I mean.. great.

For me is the difficulty the mechanical part. The connection between the rotor/stator and the engine. for that part, do you have a little bit more detail?

i'm not sure on that part, mounting the alternator because that part is not yet "opened" by me.... for now...

but my brother is mechanical expert he can assist me () if it is not to much work for him ..

email is also ok

many regards

marty

[Tobi_R26]

Hi,

my cousin provided me the mount to connect the stator to the engine. Fortunately he could use equipment at his work. I estimate to see him this weekend and I'll ask him if he still has some drawings or details.

Best regards

Tobi

[Misah]

Great

can't wait,
ps. your living in the eifel?  I drive a lot there.. with my r1200gs. when my r26 is stable enough I will try to meed in a clubtour..
regards,

marty

[Misah]

ps 2,

herewith the ring produced for the rotor/stator mounting on the r27
source, dutch club, for myself no expierence with it.
regards,
marty

[Misah]

 
morning,

on this moment I have the chance to receive an extra carter/ engine body r26,
With this body I can check if the new stator/rotor wil fit..

my riding bike will be in one piece and that is great with this weather overhere in the the netherlands.... for now.....

[Tobi_R26]

Hi Marty,

check your mails. I send you the drawing and 3D-Models (step/iges) of the stator mount.

[Misah]

Hi Toby,

great, i'm talking with my brother in lor for the realisation of the ring. :gewissen:i
I asked already via mail but for the people on the forum, which brand/type of generator did you use?  only interested, I check the drawing for my generator.. !  

many regards,
marty

[† odeon8]

(...) the drawing and 3D-Models (step/iges) of the stator mount.

Hi Toby,

the adaption looks pretty much like mine - 

Thomas

[Tobi_R26]

@ Marty: I don't know the exact type of the generator but it's a Bosch 3-Phase generator, 14V ~20A,
suitable for BMW R45-R100 and  Moto Guzzi V 65 Lario.

[Misah]

hi tobi, or other interested..

I have the same generator !!!, with additional BMW 3fase rectifier and gleichrichter

did you use also these original bmw rectifier and gleichrichter?  the are big...

i'm thinking about a Honda 3 phase rectifier as gleichrichter in one (Shindengen SH232-12V)... and for the field DF-D+ a integrated original bosch EL 14V4 ..


is this to difficult HINKING , and betTer stay with the original parts?

[Tobi_R26]

Hi,

I don't know which type of Rectifier/Gleichrichter I use. It's all beneath the dual seat, where was enough space.

http://fred2001.de/Bilder/PA040014.JPG

For the voltage regulator I use this one: http://www.stein-dinse.biz/Moto-Guzzi/Elektrik-Zuendung/Regler-Gleichrichter/Regler-fuer-Bosch-LIMA-12V::983.html

Maybe this could also be interesting: http://www.stein-dinse.biz/Komplettangebot/Unsortiert/Regler-fuer-Bosch-LIMA-inkl-Gleichr-u-Schaltplan::1834.html

Best regards,

Tobi

[Tobi_R26]

@ Odeon: Check your mails.

[Manifesto1984]

What do you think about thi kit?

http://www.ebay.de/itm/BMW-R-25-R26-Powerdynamo-12V-Lichtmaschine-mit-kontaktloser-Zundung-BMW-R24-/261284525374?pt=Motorrad_Kraftradteile&hash=item3cd5c5753e

Is it worth or it's to expensive?

[Aerosail]

What do you think about thi kit?

http://www.ebay.de/itm/BMW-R-25-R26-Powerdynamo-12V-Lichtmaschine-mit-kontaktloser-Zundung-BMW-R24-/261284525374?pt=Motorrad_Kraftradteile&hash=item3cd5c5753e

Is it worth or it's to expensive?

This is a better offer than you get at Powerdynamo.biz itself (there it´s 450€ including VAT, about 380€ without). So it seems to be a great deal. The seller says he´s a official partner of Powerdynamo and he´s also from Berlin so i would trust him.

I own this system for a R27 and don´t want to miss it anymore. You don´t need a battery what in my eyes is the biggest advantage. In total the company sold more than 10,000 units for vintage motorcycles. The can´t be all wrong.

[Misah]

It is a good offer. when you look tho the components what you get i think it is compleet and  "can not be cheaper"

For me it is the hobby to try it on a alternative way. of it is more reliable or cheaper.....   i don't now..

on this moment I have all components and my brother in law, will help me with the ring...

[Misah]

my brother in law is looking for a piece of aluminum to work with. the price have to be right so I am patient...

[Misah]

update,

I got the aluminium.. my brother had no alu and it is expensive.

on the local Ebay ( in het Netherlands marktplaats.nl) I bought it for 13 eur !!!!
also the right quality


now the project can be started again..

regards,

marty

[Misah]

hi,

on this moment the R26 is in several parts. Rebuild the new generator is heavy but a nice job. I like it alot because the old electrian in me comes alive.

it will take another few weeks to complete and test. the components to test are, the generator, stator, rectifier, full electronic new ignition with hallsensors/magnets. Also the sensor disc is homemade
check out the foto's

the 12v generator with components is full BMW r80/r100 and custommade together
I hope that I can keep my smile when everthing is ready.
I keep you guys informed....

[Tobi_R26]

Hi Marty,

Nice job so far. Have an eye on the correct alignment of stator and rotor and tight screws because the air gap is quiet small. It took me about 4 generators (collision which destroyed the stator coils), but now it works fine.

Take care,

Tobi

[Misah]

hi Toby

Thanks for your reply.!

What do you mean exactly?  you mean the "exact" mechanic positioning of the rotor (sways), aligning within the stator? Ore the stator within the new aluminium ring? of the combination of both ?


or other electronic short-circuit problems?
(difficult technical English )

regards

marty

[Tobi_R26]

The rotor has to turn exactly in the center, so it does not collide/scratch when running at temperature and with all the vibrations. As mentioned it cost me 3 generators which lasted 50-100km each. Finally I used several strips of cardboard to secure the right and concentric spacing before fixing the screws of the stator.

[Tobi_R26]

P.S. First I tried the alignment with a normal thickness gauge, but the air gap is arced, so the gauge was apparently not exact enough. (or maybe I was just too clumsy

[Misah]

hi tobi,
again thanks.

mm, the ring made from the drawing had three center points/bubbles who keep the ring exact in the middle. this was not planned but   that looks ok. know centering the stator with the rotor can be a bigger problem. I will measure the distance from the stator to the outside ring so this will be the best I can do.

when it went wrong, did you hear anything starting your engine, during the first 50km?

regards and have an nice weekend all,

marty

[Tobi_R26]

Hi Marty,

The first tries I thought fixing at 3 three points would be sufficient. There was no scatching noise or so recongnisable while turning the crankshaft via Kickstarter, but maybe if I had used some stetoscope or so.
During operation the engine noise are too dominant. After 50km the battery light went on but I could manage to return home before the battery was done. The stator showed scratch marks on the inside and the stator coils were loose within the housing, probably because of the scratching and the resulting temperature raise.

Best regards,

Tobi

[Misah]

morning all, Tobi,

thanks for the text!!!. yesterday a friend made some plastic "spacers" who exact got the stator in the middle/centre.I think this is the best we can do.
I keep you informed
when you have any tip please  

marty

[Misah]

hi Tobi and forummembers

on this moment the engine of the r26 runs. yes yes yes The new homemade bought ignition works fine. the 3fase generator works too, the red charging light stops to burn when the engine runs harder than idle.

but i have a additional mechanical sound when the motors runs. agh.
we made several extra preparations to center the rotor and stator so that can not be the problem. we thought...

tonight we checked the stator and on the pictures you can see the problem, the copper winding's are scratched...   
The winding's of the stator are not closed up/fixed with the three screws. this looks like a design failure in the alu ring.

herewith some pics where you can see my problem. a friend will change the ring with a additional one where the stator while be fixed by the three screws.