If you look at the threads about stepper/servo motor drives, you see that 3/4/5 volt motors are being driven at 12/24/36 volts to increase efficiency and response.
I am interested in using surplus 12 volt DC motors to power platforms, such as a lawn tractor. I think that a 12VDC starter motor connected an H-bridge circuit and powered at 24 to 36 volts should be useful to experiment with. 2 motors can provide plenty of torque to move the wheels.
Most of my notion here is based on barstool racing. Very adventureous bunch. However, the power output from a starter motor is tremendous. I think that if you use PWM to control the motor speed, that a tractor can move just as well with electrics as with a gas engine.
Any thoughts on the motor "overclocking" ?