The generator mounted on the shaft is only about that long. Some models did have a vibration damper on top of the generator and used a timing case cover with a bulge. I’m guessing that would give another inch or two of room, but one would have to find one of those covers and modify the front forks to accommodate the extra length.
Here’s the generator: http://www.bmwclassicmotorcycles.com/parts/wp-content/uploads/2014/04/BMW-R50-to-R69S-Generator.png I think it’s less than 5” diameter but there is about 5” available. -Steve > On May 9, 2020, at 10:59 PM, Alan Arrison via EV <[email protected]> wrote: > > Only 2" long? That doesn't sound right. > >> On 5/9/2020 6:18 PM, steve sawtelle via EV wrote: >> Hi all, >> >> This is a bit of-topic, but I can't think of a better place to ask this. >> >> Another group I subscribe to is devoted to BMW motorcycles from the 1960's >> (slash2s). For the most part we are getting 'long in tooth', and one member >> lamented that, although he could still ride, he had trouble kick-starting >> the bike due to knee problems. A lot of ideas were generated; one that came >> to me was that the engines used in these motorcycles (or close to them) were >> used in BMW cars of the late 50's and early 60's. They had a motor-generator >> mounted directly to the crank which was used to start the car and then >> charge the battery once it was running. Now these motor-generators were >> pretty big - maybe 12" or so in diameter, which would be too big to adapt to >> a motorcycle. But I was thinking, we have made huge strides in motor design >> in the past 50 years, so maybe a motor-generator could be designed to fit in >> place of the generator on these bikes. the space is about 5" diameter by 2" >> long. On my motorcycle, I measured less than 10 ft-lbs torque to push >> through TDC, and I hav > e >> the hardest engine to kick start in the series (R69S). This seems pretty >> low, but these engines, when well tuned, could be started by pushing the >> kickstarter through by hand. >> >> So, as a thought exercise, do you think a motor-generator could be designed >> to start these engines yet fit within the physical constraints? >> >> -SteveS >> >> >> >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: >> <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20200509/ea9286aa/attachment.html> >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> ARCHIVE: http://www.evdl.org/archive/index.html >> INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) >> > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/index.html > INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20200510/736bf697/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
