Since I have absolutely no idea myself I've been watching this thread and just waiting for an answer like this!
So in that spirit (and just for the sake of levity)...
To the OP: Build two identical motors, stick one on the shelf. The other is your "test mule". Throw it in the car, add a 50 shot, and run 'er. Still good? Go for 100. (And so on and so on....) Once you blow it up you'll have your answer!