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Daox - I don't think there's a simple rule of thumb for how much you can overvolt/overload a motor.
The question comes up pretty frequently on the EVDL, and if there were a rule of thumb, it'd get trotted out each time.
Consider that Mike D originally field tested his DIY EV assist in his Insight with a 24v electric wheelchair motor running @ 48v. Probably weighed approximately what this one does - maybe less. But he found it got too hot, and ultimately switched to an ETEK permanent magnet (8hp continuous, if I'm not mistaken).
It's all about the heat. You can stuff as much V & A through a motor as you like, provided you can keep it from getting too hot.
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