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Their stated reason for the proprietary engine is so they can tune it specifically for the purpose they are using it for. They know the specific size, weight, and gearing they're going to use for the final vehicle, so they're making an engine specifically to work best with it.
At least, that's the company line. I think there's probably something more to it than that, especially since they said they were devoted to using as many off the shelf parts as possible to make the thing easy to service.
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