Why is everyone stuck on 7? It is a 14 cylinder engine. The fact that the crankshaft is assembled from two, 7 cylinder sections bolted together is irrelevant. And being a 2 stroke cycle, each cylinder fires 0nce per every 360 degrees crank rotation, for a firing interval of 25.72 degrees, the 12 cylinder version…

The ring gear does not need to be very hot to provide a shrink fit as it cools down.

And the 12 cylinder version has a firing interval of 30 degrees.

5,608,310 lbf·ft) @ 102 rpm