Since we use our CTs as rentals and for student training, I don't have ours set up to do >5500 RPM at WOT. According to the Rotax manual, you've got 5 minutes grace between 5500 and 5800. And "never exceed 5800." Though you can go to 6200 for a minute without an inspection. 5800-6200 for more than a minute, inspect pushrods. One minute and hit 6500, inspect push rods. More than a minute above 6500, inspect/rebuild whole engine.
I always thought the 100 HP claim was kind of their marketing department spin since the 912 is claimed to be a 100 HP engine, but only develops 100 HP at 5800 RPM. So I guess it would be more accurate to say that it's a 5 minute 100 HP engine...
I remember Brian Carpenter in class showing a graph that I think overlaid HP and torque. Peak torque is just under 4900 RPM at about 128 NM. Peak HP is at 5800 RPM with 5500 continuous delivering about 93 HP. I think I remember Brian saying that optimum performance is about 5250. Anyone else remember this?
Sid Lloyd
LSRM A/WS