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they make 5 cyls too......"radial" is the term not rotory
like a star...that allows balance.
I think the real revolution could be in "5" strokjes instead of 4..
inject water into the cyl on the 5th stroke and utilize the energy that is usually wasted as heat in the radiator....it's been done by a guy who build cams for hi po engines...and it works and the engine never gets to hot to lay your hand on it.
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