bernielah wrote:Before I spend lots of time, energy and money pursuing this objective, can anyone see an obvious reason why it would NOT work.
1) Magic pie axle is intended to be supported at both ends - you need a stub axle for a car. The MP axle is nowhere near strong enough to be used a stub axle
2) Even support both ends, the MP axle and bearings are likely to be completely inadequate.
3) Nowhere near enough power. The MP is rated for 1KW continuous, two of them will give you about 3 HP. You probably won't be much in the way of peak out of them because of restricted airflow tucked inside a steel wheel.
I think they are completely unsuited for you application and should look at alternatives, like dnmunn suggests.