thankyou for responding major i dont know much about it but i know or think i know that a motor will produce electricity and a altenator can be used as a motor i am not sure of if it is powerfull enough to..........
You can learn a lot here. Start with this: http://www.diyelectriccar.com/forums/showthread.php?t=669
Here you should gather basics about what is required to power a car electrically and about torque, power, energy, volts and amps and such. That is one side of the equation. Then learn to use the search feature on this site and look for wheel motors. After all that, come back and we'll talk. Or just trust me, it ain't goin' work
But you are correct in the basic premise, electric machinery is bidirectional, meaning any motor can generate and any generator (or alternator) can motor, if properly excited. It is just the application which kills your idea