DIY Electric Car Forums > EV Conversions and Builds > Electric Bikes

jackbauer · #1 08-10-2010, 01:36 PM

Picked up the cbr today. Thinking of renaming my cat Peter Fonda

. Its a '94 with just under 25k miles on the clock. Some damage to the right side fairing as it had been stolen at one stage.

Plan is to use 2 nissan 48v forklift traction motors for series - parallel setup. Minimum of 72v possibly go to 96. Controller will be my own custom igbt version of the open revolt. Not sure about the charger but the petrol tank is plenty big to accomodate a low power version of the open source charger by Simon Rafferty.

Batteries will either be Odyssey pc680 agms or headway 16ah. Thats the basic plan anyway. Now i've never even sat on much less owned a bike until today so like in that film wild hogs its a case of "all the gear , no idea!"

So first question. Can someone please tell me how to put this thing on its center stand ??

jackbauer · #2 08-10-2010, 01:51 PM

I took the motors to a local engineering works last week and had the coms turned and the splined shafts turned down to 19mm. Saturday morning I set about milling a 6mm keyway into the shafts. Nightmare job. The shafts are glass hard

. Got there in the end so i'm into scraping out the com segments and replacing the brushes.

ngrimm · #3 08-10-2010, 02:26 PM

Should be a great conversion. Be interesting to see how you get two motors in there

jackbauer · #4 08-13-2010, 03:23 PM

Started the teardown. Nothing really exciting but i was bored so figured i'd do a few videos:
http://www.youtube.com/watch?v=HV9QZD7zP3w
http://www.youtube.com/watch?v=X-SHkNieR20

Woodsmith · #5 08-13-2010, 03:40 PM

Quote:

Originally Posted by jackbauer

So first question. Can someone please tell me how to put this thing on its center stand ??

I was about to start a detailed explanation and then I noticed the

and stopped.

I take it you do know how to ride a bike and have a licence and that this isn't just an ornament.

I'll have to watch the videos later, my broadband is baulking at any videos at the moment.

How are you coupling the motors to the drive?
There was a dirt bike with a nice bevel gear case on the motor. I was thinking of two pinions and one crown wheel to get a V twin set up.

http://www.diyelectriccar.com/forums...ric-48239.html

jackbauer · #6 08-13-2010, 03:45 PM

Nope never ridden a bike and don't have a bike license

. It was a serious question. A friend showed me how to use the center stand yesterday. Once i get it running i'll take lessons!

the v twin idea is very interesting but i imagine i'll just use a short chain between the two motors and then a main chain from the rear motor to the sprocket in order to keep it simple and stay on budget.

Nothing exciting in the videos just draining the fluids

Woodsmith · #7 08-13-2010, 07:41 PM

Quote:

Originally Posted by jackbauer

Nope never ridden a bike and don't have a bike license

. It was a serious question. A friend showed me how to use the center stand yesterday. Once i get it running i'll take lessons!

I did the quick access course back in 1999. It wasn't difficult, though I can't balance very well I passed first time.
The best advice, apart from learning the highway code and practicing the hazard perception test, is to look where you want to go not where you are going. Even if you know nothing about driving a car or a bike the bike will still go where you look not where you think you are pointing it.
Also when you stop only ever put your left leg down, never your right. Your right foot is supposed to be on the brake and you are supposed to have found the right gear before you stop. I hardly ever see bikers doing that. They always stop on the front brake with their right foot down and then find the gears. You will fail on that alone.

Woodsmith · #8 08-13-2010, 07:49 PM

Oh, your controller.

I don't know how the controller works but I was advised that there are two ways a controller controls. Either it controls the power or it controls the speed.
You want to control the power.

If you control the speed then you will fall off when you corner.
The problem is that if the controller controls the speed then the speed of the rear wheel will be constant as you hold the throttle still and lean the bike into a corner. As the bike leans the effective radius of the rear tyre decreases and so your road speed decreases. As your road speed decreases mid corner the bike falls over.

If you control the power then as the effective radius of the tyre decreases the wheel speed will increase to provide the same power and teh bike will hold the same road speed and not fall over.