Do you have the part number for your motor?
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.
>>>>>
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>
>
>
