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[–][deleted] 2 insightful - 2 fun2 insightful - 1 fun3 insightful - 2 fun -  (1 child)

I know something even better: https://en.wikipedia.org/wiki/Stelzer_engine . Sadly the most sources on this one are only available in German. General Motor once offered him money to stop developing this engine. At least he says so.

[–]JasonCarswell[S] 1 insightful - 2 fun1 insightful - 1 fun2 insightful - 2 fun -  (0 children)

Ooooo. That's a neat one. You should post it. There's another weird one out there too, Italian I think, but I don't even know how to find it other than maybe it will cross my path on YouTube again.

Here are more, but it's not there: https://en.wikipedia.org/wiki/Category:Proposed_engines