Sunday, October 26, 2008
Sunday, October 19, 2008
I've been struggling to commit to an engine and battery combination. A Permanent Magnet motor and 40AmpHour batteries, will give me a very light bike, but will sacrifice durability and range. On the other hand, a 6.7" Series Wound motor with 60 AH batteries will give me the durability and range, but the extra weight means less acceleration.
The bottom line for weight is staying true to the project goals. The end result has to be a "bolt-in" kit. The average gearhead/propellerhead should be able take his Gixxer and yank the ICE motor, put in my battery frame and motor mount, then attach the components of his choice. If the project is significantly heavier or lighter than the original factory weight, the suspension components will need reworking ($$$).
So here's the weights as measured or estimated (*) assuming the heavier motor and batteries:
Rolling Frame 160
Brackets & Fasteners 32
Body Work 38
Battery & Motor 188
Missing Cosmetics 10*
Motor & Batt. Mount 20*
Chain & Sprockets 15*
Charger (external) 0*
Total 473 ( Factory Dry Weight: 456 lbs )
The PM motors are about 20 lbs lighter, so that would allow the kitted EV bike to use either motor without being too far off base.
Wednesday, October 15, 2008
Tuesday, October 7, 2008
Saturday, October 4, 2008
I removed several brackets around the rear end, and stopped to take some pics. Hopefully, the pictures will prevent re-assembly brain glitches ("where the heck does this go"?). While taking the pictures, I noticed the lack of clearance between the face of the chain sprocket and the swing arm. Not a lot of room for a belt pulley.... hmm. I will be measuring this area very carefully.
I've been emailing questions to Phil at Supermax, to get some more details on their pulleys. The pulleys look awesome, but their website is pain to navigate, and no dimensional specs are listed anywhere. Fortunately, they respond to inquiries quickly and seem very nice.
Thursday, October 2, 2008
Harley's and other cruisers have used belts for a long time. Years ago, I had a Kawasaki GPz305 with a belt drive. Ever since that bike, I couldn't understand why anyone would want a chain. No lube, no adjustment, no mess and super quiet.
The downside is that a belt drive limits how small the size of the front sprocket, because the belt can't bend around a small sprocket (pulley) without seriously affecting life span of the belt. So this means a jackshaft will be needed to reduce the speed of the final drive, adding some costs and complexity to the project.