R75/5 Magneto Ignition and Charging Upgrade Conversion. AWESOME!!!

Discussion in 'Airheads' started by patanga, May 8, 2012.

  1. patanga

    patanga BMWAirheadsDownunder

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    Hi folks. A friend recently came to me with running problems on his 75/5 and after discussing and researching the options we elected to go with the Powerdynamo magneto ignition & charging system. Besides the age and reliability concerns of running 40 year old electrics, the other problem with the old system was that the cam shaft nose was badly worn from the advance unit having been over tightened over the years. That mean't stripping down much of the motor & removing the gearbox to replace the cam shaft. The owner was keen to avoid that hassle when the rest of engine mechanics on the bike seemed to be O.K. A fair call I thought.

    The owner was however enthusiastic about upgrading the electrics with something that would be compatible with the old /5 systems and not create potential issues with reported risk of damage to the kick start mechanism, as has been suggested with most other electronic ignition units into the early BM points triggered ignition systems. Enter the Powerdynamo system. To say that we were quietly expecting some improvement was an understatement. Neither of us was quite prepared for how good it was going to be. [​IMG]

    I can only say that the Powerdynamo system is awesome and it has transformed the /5's performance. If you are going to have one of these fitted to your /5 and want to put the rectifier/regulator in the place where the diode board was then the wiring loom in the kit will need to be shortened and modified slightly to suit. In the interests of maintaining a more original appearance I was keen to keep the rectifier/ regulator out of sight and so I checked with the manufacturer to make sure they supported this placement. (the instructions read that they do, but I wanted to make sure for warranty purposes). With the blessings from Powerdynamo I proceeded with the upgrade. The longer loom is an allowance for those wishing to place the unit further back in the frame. The other concern I had with a placement of the rectifier closer to the coil was the potential for electrical interference. As this bike is still a daily 'short hop' commuter I was happy to keep it as original as possible and that meant keeping the rectifyer out of sight. If the bike was being used for competition, or long haul touring I may have opted to put the rectifier/ regulator on the frame and in the air flow to help it dissipate heat. Your call.

    Please note that the Powerdynamo system is NOT compatible with electronic tacho's. (Pity because I'd like to be able to offer this unit to owners of later models as well). While the ignition and charging system will still work fine if you fit this unit to later models the electronic tacho will not function. Cable tacho /6 models and earlier are fine.

    Regards degree of fitment difficulty, this conversion is reasonably straight forward for those who know their stuff and a couple of special tools are required. For instance once you fit the magneto rotor you will need a dedicated puller (available ex Powerdynamo) to remove it again as the standard BM rotor puller bolt no longer does the task. I'd suggest therefore that if you are not 100% confident that the system be fitted by a qualified repairer. An awesome performance outcome for and old /5 soldier.

    Here is a link to a short video that I made showing to unit and its operation. Cheers. http://www.youtube.com/watch?v=mwrWYAKXM68
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    #1
  2. kbasa

    kbasa Roubaix! Super Moderator

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    Start this in the airheads forum next time, k?

    Moved it to Airheads.

    Thanks and thanks for the report!
    #2
  3. wirewrkr

    wirewrkr the thread-killer

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    Does the lack of info about where to purchase said system and anything else about it's origins indicate that you are marketing these yourself?
    #3
  4. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    Bing bing bing... Spidey alarm going off.

    It's a magneto-dynamo conversion for 480 Eur (630$US). 190Watt output. Google "powerdynamo" for more info...

    FWIW.
    #4
  5. isdt BMW

    isdt BMW willserv@aol.com

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    If this is a mag-dyno, does it eliminate the need for a battery?
    #5
  6. patanga

    patanga BMWAirheadsDownunder

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    Hi.. The company I bought the unit from is called Powerdynamo in Germany. You will find them online at http://www.powerdynamo.biz/eng/sitemap.htm. Their website is not the easiest to navigate but with some patience you'll get there. I only buy these in for local customers here in Australia who want me to supply & fit.

    Regards the battery question; the Powerdynamo unit fitted is their combined ignition and charging system in one, for bikes running full systems (lights etc) so the battery is still required. Should the battery ever fail though the ignition can still be used by simply disconnecting one of the relay wires. If you do go ahead and buy one of these units be sure to measure the alternator stator housing recess (i.e the I.D. of the mounting face in the timing chest) as BMW made two different sizes in the era (105mm & 107mm). Powerdynamo has the correct size for each, but you need to let them know which one you require. Be aware also that there are two systems available. One is just the charging system and the other is the complete charging and ignition system. I am referring to the complete system (item number 70 67 999 00).

    Hope this answers everything for you. Cheers & good luck.
    #6
  7. Sniper X

    Sniper X De Oppresso Liber

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    I knew that by the time I read the second sentence, this is SPAM in a way. Look at his number of posts.....at least that is what I am guessing.
    #7
  8. disston

    disston ShadeTreeExpert

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    The guy lives and works in Australia. The units are built in Germany by a German company.

    Some of you guys wouldn't trust your Mother. :huh
    #8
  9. Sniper X

    Sniper X De Oppresso Liber

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    Well, you can live anywhere these days and rep a company anywhere else. I like the idea of a mag and such for an Airhead though.....So if I get this straight, this thing does both Ignition duty, AND is a 180amp generator or Alternator?
    #9
  10. disston

    disston ShadeTreeExpert

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    That does sound like what it is. Is this the first time we have had a Magneto ignition available?
    #10
  11. wirewrkr

    wirewrkr the thread-killer

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    Joel Rapose seems to be a US importer for these for the /2 type engine
    #11
  12. Airhead Wrangler

    Airhead Wrangler Adios Mexico

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    This same one has been available for quite a while in europe, but just haven't made it over here for whatever reason. HPN has used them on some of their race bikes going back to the 80s, not sure what brand though.
    #12
  13. brocktoon

    brocktoon Been here awhile

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    Mostly because my mother is always trying to sell me some aftermarket charging system or other.
    #13
  14. Airhead Wrangler

    Airhead Wrangler Adios Mexico

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    Didn't stagehand use one of these on the Fossa? It was either him or the other guy working on a ISDT style airhead.
    #14
  15. patanga

    patanga BMWAirheadsDownunder

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    sniperX... I have no interest in this unit other than to share some details about an airheads fix that exceeded any of our expectations. Will I be recommending it to others locally?,.. If the symptoms and application are the same, you bet I will. Isn't that what these forums are about anyway?..... Am I their agent?... No I am not. Can you buy one from me when you are in New Mexico?... No you can't. I don't stock them and am not interested in selling abroad. Why would I anyway? and risk having to deal with cynics like you. I have installed one and am excited enough to share the good news.Talk about shooting the messenger. Cheers people.
    #15
  16. datchew

    datchew Don't buy from Brad

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    How do you know I had a mother? :patch


    :lol3:lol3 What a warm welcome this guy had.
    #16
  17. ontic

    ontic

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    Thanks a lot for the post and video Patanga, I have been considering one of these units for my G/S, which they also make and sell for dual-plugged airheads (as I understand it, thanks to a Mr Rooney's request for them to develop such). I've heard really good things about the powerdynamo set up. Great strong spark and starting, really simple system, lightweight and reliable. And yes, you can run without a battery as I understand it. The only concern for me is if I can deal with the limited output. I think it should suffice as I don't want to run too many power-hungry extras anyway. In short I am leaning towards going this way (twin plug version).
    One of the more surprising effects of a powerdynamo swap that I have been told first-hand of is of a rather significant reduction in fuel consumption. I'll leave it to someone more competent to try to explain (or critique) it. This was 'tested' in a back to back multi-thousand KM interstate run with no other changes made- ran there on stock system and then ran the way back on a powerdynamo. Significant difference. Very reliable source. Take it or leave it.

    And don't worry about the likes of sniperX. Check HIS post count :lol3 (some peoples 'spidy sense' tingles at low-post-count members, mine more commonly itches at the opposite end of the post-count spectrum:deal)
    #17
  18. ozmoses

    ozmoses Ride On

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    Ontic, while everything else (simplicity included) seemed favorable, an output of less than stock(iirc) w/ a price tag near a MotorradElektrik unit made me wonder.

    I don't use electronic goodies myself, so perhaps it's fine. The big plus, as I see it, would be the ability to run sans battery!
    #18
  19. rusty44

    rusty44 Been here awhile

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    Great Video.

    Thanks for posting it!!!!!!!!!.....Al
    #19
  20. ErikDK

    ErikDK Been here awhile

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    I hope 110 watts is net after the ignition system has taken its share.

    Having owned both a Guzzi and a /7 airhead i can witness that the Bosch charging system is a weak link.

    Between the two bikes, 3 rotors burned out. Not that the modern total-loss permanent magnet systems are that much better, just look at the numbers of stators an R/R's that burn out on the BMW F-series and Triumphs.

    What's Guzzi using these days?
    #20