Electric equivalent of a 150cc  By  h3nry (Read 6,535 times)

750W compares to 1BHP.
A 50cc 4 stroke is rated 2BHP usually (modern ones are 3 to 4BHP).
So for similar power of a 150cc engine, you'll need a ~4500W electric motor.
They created bikes like this, Xtreme XM-4000 Li and Xm-5000 Li.

DC Electric motors get the most of their torque at very low RPM's (depending on what kind of motor you'll equip it with).
Unlike a gasoline engine, a DC electric motor has the higher the RPM, the lower the Torque.
It is best to have a high gearing system, and keep the motor under 2k RPM.
As long as you provide it with enough cooling, and don't overload it.
You'll also need a wad full of batteries.

Some things you might find of interest;

www.evalbum.com/1133

www.evalbum.com/type/MTCY

www.vectrix.com/index.php

www.treehugger.com/cars/the-7-best-electric-scooters-from-prototypes-to-production-models.html

www.zapworld.com/zapino-electric-scooter

I had some links for places to buy conversion kits to build your own electric vehicle, you might like thoae, I'll see if I can find it for you.

A conversion kit that could be made to work on a scooter I think

www.thunderstruck-ev.com/ac-motor-kits.html

The issue would be having as strong enough battery to allow you to go beyond 20 miles . I read an article on Hot Rod Magazine about some guys putting electric motors in cars and run on a 1/4 mile strip . One guy used a forklift motor in a Toyoat Corrola . Backing out of the driveway he twisted the driveshaft and had to get a HD custom on built . A DC motor draws more amps than an AC motor which drains a battery faster and gets hot . If you ever had a high end RC car you know its fun for a few minutes then you need to replace the battery pack and let the other one cool before recharging it .

If you could use a small portable generator to power the motor(s) plus lights that would be awesome . Another option would be to wire up some 18volt batteries like in a drill on separate circuits so you charge one while using the power in another

I would use a belt drive too . I have thought able using a 2T engine to drive a hydraulic pump with lines going to the hubs to drive the wheel or wheels if the front is included in being powered . Some of the racing CDIs for a 2T are only 4 poles and have a much smaller magneto wheel that with lots of testing maybe mounted the the wheels to help charge the battery .

What would really be wild is a steam powered scooter . Steam has enough power to drive a locomotive but having to keep putting in water on a scooter may limit the range unless you could recirculate the steam rather than have it drive the piston then exit the exhaust . Before I die I want to ride in a steam powered car .

So to have hijacked a lil bit but just thought I would share my 2 cents on this interesting topic

A motor spinning at 1500 rpm with an output wheel that's 13 inches is going to push you at 58mph if the differential is 1. That's without the variator, with it would kinda be a waste I think( unnecessarily high rpms to get to speed, possibly better if you maintain a higher speed tho)