80lbs for the motor, youch!! I think mine is 24lbs, but then yours has more thermal mass and probably is better matched to the heft of a BMW. My Honda Electric is about 440lbs with 55Ah AGMs. My IC bike is a BMW 1100RT, I know the struggle the extra mass the BMW poses.
Cheers Jeff On Tue, Nov 4, 2008 at 8:38 AM, SteveS <[EMAIL PROTECTED]> wrote: > Yeah, I know having the motor down low is bad for spray, gravel, etc. And, > in general, batteries low would help to lower the COG. However, the lower > frame tube geometry make it very difficult to mount my present batteries > low. I'm thinking of adding a blower to the motor, in which case I will > control the openings to the motor and can keep stuff out. It just turns out > the motor will fit in very nicely in that space. It will actually be a lower > COG using the chain drive than the direct drive was. Since I have a big > motor (80lbs) and hope to go to Lithium, in the end it should be a good > design. I also have a short range need so I don't need a lot of battery > weight. > > But keep me thinking! I haven't cut any metal yet. > > - SteveS > > Jeffrey Blamey wrote: > >> Is there any way to nest the motor higher to get battery weight lower. >> With my PMG132 I high mounted the motor well out of the way of road >> spray. It sits under the front of the seat back of the tank. Just a >> thought since you are so early in stage 2. >> >> Jeff Blamey >> >> On Tue, Nov 4, 2008 at 6:57 AM, SteveS <[EMAIL PROTECTED]> wrote: >> >>> >>> I know they made a lower ratio for the R75, but I didn't consider other >>> models. Might be worth a look, but probably can't get me more than 10% >>> higher. >>> >>> I've been playing around with a gear or belt drive layout. Actually it >>> may >>> end up working out better as far as fitting everything in the frame. The >>> motor can nest down between the lower frame tubes leaving a nice large >>> area >>> above that could be made to fit a variety of batteries. I have some SLAs >>> to >>> learn on, but I hope to go to lithium at some point, so this may end up >>> as a >>> good solution. >>> >>> I was disappointed for a day, but now I'm re-energized. I think I'll use >>> a >>> chain drive first since it's cheap and I can try out a few different >>> ratios. >>> If it's to noisy I can then change over to a belt drive once I settle on >>> a >>> gear ratio. >>> >>> - SteveS >>> >>> john fisher wrote: >>> >>>> >>>> its a long shot, but different rear-end ratios were built for racing the >>>> R75/5 and I think for the R100/7 bikes. Reg >>>> Pridmore and others raced them with shaft drive. Reg hasn't had a shop >>>> in >>>> years, but the folks at Mountain View or San >>>> Jose BMW might have a ring and pinion lying on a shelf. Its also >>>> possible >>>> that the gears from an R65 or R50 or R75 will >>>> fit- in those days the bikes shared parts across the range. The R90s >>>> might >>>> have had a different final drive ratio too. >>>> >>>> Just a thought. ( rode an R90S and an R100RS for many years) >>>> >>>> SteveS wrote: >>>> >>>> >>>>> >>>>> So I guess I'm finally convinced I need to add a gear reduction. >>>>> >>>>> ------------------------------------------------------------------------ >>>>> >>>>> >>>>> No virus found in this incoming message. >>>>> Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: >>>>> 270.8.5/1764 - Release Date: 11/3/2008 7:46 AM >>>>> >>>>> >>>>> >>> >>> >>> ------------------------------------------------------------------------ >>> >>> >>> No virus found in this incoming message. >>> Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: >>> 270.8.6/1766 - Release Date: 11/4/2008 8:26 AM >>> >>> > > >
