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cfgray- You have your terminology mixed up on the Ur (Le Rhone series) and U (Gnome series) Oberursels. See earlier post. The U.0 was a 7 cylinder engine of 80 hp and the U.I was a 9 cylinder engine of 100 hp. The U.II was apparently never produced.
On the 160 hp Gnome 9N, all cylinders fire on all four switch settings, just not as frequently on switch settings 1, 2, and 3. Some cylinders not firing on switch settings 1, 2, and 3 is a commonly held misbelief on the 9N. This ingenious switch architecture ensured spark plugs did not foul and that heat loads across all cylinders were kept identical. It also cut way down on the need to use the coupe/blip switch.
Taz
Terry Phillips
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