Ummmm.. why?
A three cylinder (or multiples thereof) four stroke, engine has inherent smoothness that is difficult to match, so why not a 60 degree V6 of three liters displacement?
There'd be one less head and accompaning parasitic losses from cams and chains. One less set of manifolds to seal, one less head gasket.
Pairing the con-rods in a V6 allows for better thrust bearing load adjustment than sandwiching a third big end on a common journal with two others in a W9.
Narrowing the V angle and using an offset in the crank journals would make the packaging even more compact AND would allow cost saving in manufacturing by permitting the machining of one head, one exhaust manifold, one intake.
And a W3 already exists as an aftermarket motorcycle 50% change (not improvement) from the Harley-Davidson V-twin.
As an artistic endevour it is pretty. As a practical device, I feel it is a solution in search of a problem that doesn't exist.
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