I should've re-read my paperwork before talking to the camera, my angles were a little bit off. The valve opens at 85 degrees after TC, stays open the rest of the power stroke, all of the exhaust stroke, and 115 degrees of the intake, so a total of 390 degrees.
This diagram is for the 100 Gnome, but I think the 160 is the same.
As for the carb, the early 50 hp Gnomes (like George's) had a rudimentary carb, but for some reason they didn't use them on the bigger 100s and 160s. I've always been told that it wasn't practical because of the way the fuel/air was delivered to the cylinders through ports in the cylinder base. Despite what is commonly written, pretty much all of the rest of the rotaries did have carbs, with a slide valve regulating the air and a needle valve attached to it to regulate the fuel. LeRhones, Clergets, and the German Oberursal all had this.
Gnome cylinder, about the same cubic inches as an R-985, but a lot less cooling fins
Selector unit taken in half, showing the brass disc with fiber inserts that the brushes go against to "throttle" the ignition
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