I want to convert my gas gokart to electric. Fully loaded with me and the dogs, it weighs less than 500 lbs and does not need to go faster than 15 mph. We drive on level ground and only need to go around 3 miles per day at mostly walking speeds.
The rear axel has a 9" sprocket with what appears to be #40 chain and I would like to keep that sprocket and chain if possible. I see that the motors like the the MY1020 have 8mm sprockets. Is it possible to change the motor's sprocket to fit #40 chain, or should I replace the axel sprocket to accept the 8mm chain?
How many volts and how many watts do I need? Is that 48 volt 1000 watt motor a logical choice?
An 8-3/4" sprocket for #40 chain has 54 teeth so that is what I used for the first calculation. The tires look like they are 16" diameter from the photos however if they are a different size then please let me know so I can recalculate.
If a MY1020 motor was used then a 95 tooth axle sprocket for 8mm chain would be needed. This is not a standard size sprocket so it would need to be custom made by a sprocket maker such as Rebel Gears.
If you can live with a 4.25 MPH top speed then using the 36 Volt 600 Watt gear motor would be the best way to go because the existing axle sprocket and chain could be reused. The car would also have a lot of torque with this setup for going up ramps and inclines, such as when loading onto a truck or trailer, or going up steep driveways. We also have a 36 Volt 650 Watt gear motor with a 550 RPM output shaft speed which would provide a 4.89 MPH top speed with the existing 54 tooth axle sprocket.
For a 3 mile drive on flat ground at 3 to 5 MPH a battery pack made from three 12 Volt 22Ah batteries would do the job.
We can make a kit out of the parts that are needed which is prewired with matching connectors, or the parts could be purchased separately. Please let us know which direction you are leaning towards with the motors and if you have any questions.
Thanks for the quick reply. Yes, the tires are 16" diameter. The 36 volt 600 Watt motor sounds OK to me. Torque to get up ramps is good, but we won't have the speed to get away from rowdy kids, so we'll have to go old school and bite them. Let's talk about a kit. Do you have a speed control that can be hooked up like a gas pedal?
The THR-89 and THR-91 foot throttles are designed to mount onto a flat floorboard and I notice that the floorboard on the mini model T car is angled upwards where the throttle is. So these foot throttles may not work very well at that floorboard angle and be too vertical at the zero throttle position to be able to comfortably use. You might want to consider using the wire pull throttle and the existing gas pedal if it looks to you like the foot throttles will not work very well with the angled floorboard.
All this looks good and I understand about the foot throttles. The only hang up is the less than 5mph top speed. Is there any way of keeping my axel sprocket and chain and getting more speed?
My sprocket does have 54 teeth. ( I counted) and it seems to me that it's 1/2 inch between the pins, so my guess is that it's #40 chain, but I don't know for sure.
We do not carry any motors that sprockets for #41/#420 chain will fit onto other than gear motors, which would provide a 4 or 5 MPH top speed when used with the existing 54 tooth axle sprocket.
An industrial 1.5 horsepower 36VDC 1800 RPM motor would have a 7/8" shaft that a common #41 sprocket will fit onto and would provide a top speed of around 15 MPH when used with the existing 54 tooth sprocket. This type of industrial motor costs around $600 though. Our controllers, batteries, and other parts will work with this type of motor.
Another less expensive option would be to use one of our 1000 Watt MY1020 motors and have a 96 tooth sprocket custom made for the rear axle. A custom made 96 tooth sprocket would probably cost around $100 to have made so this option would cost a lot less than using an industrial motor.
Thanks for sticking with me on this. I see how easy it would be to use that 600 watt gear motor, but we are going to need more than >5mph to keep up with parades. I will check with Rebel Gear to see about having a 96 tooth sprocket in 8mm made, but before I do I want ask about having a machine shop weld a #41 sprocket to the 8mm sprocket that is on the MY1020. Could this be a practical solution to my problem?
We have three practical solutions.
1- Rebel Gear can make a 96 tooth sprocket for 8mm chain for $70. The sprocket would be 9" inches in diameter which would be good. I then use your MY 1020 motor and everything is groovy....right?
2- I get an industrial motor for $600 that can take a #41 sprocket and use my existing sprocket and chain and your controller, throttle and batteries....right?
3- I get a #41 sprocket welded onto your MY 1020 motor and save myself around $350 -$400....right?
Putting aside the additional cost of the industrial motor, does it have advantages over the MY1020?
Will it give me something for the money?
I did call Rebel Gear and they said they could make my sprocket for $70 and it would be 9" in diameter. I'm going to dismantle my kart and take the existing sprocket off to see exactly how it is attached to the axel. I'll then order the 8mm sprocket from Rebel Gear. The did seem confused by the 8mm description. Is there another term for that size chain?
Please put together a motor, controller, throttle, battery package for me. I want whichever MY1020 motor you suggest. If the Rebel Gear sprocket doesn't work out, then I can have a #41 sprocket welded to the 1020's 8mm sprocket and use my old sprocket and chain. What do you think?
What about using your 8mm 74 tooth axel sprocket? #spr874 . I believe the speed calculator showed 19.36 top speed. Is there an advantage to using a 96 tooth sprocket?
I will start working on the kit for this project. Which throttle would you like included with the kit?
I'd like the wire pull throttle, so I can use my existing gas pedal. Rebel Gear did say they could make a 96 tooth sprocket for the 8mm chain, so it looks like that would be the best way to go....right?