To put it bluntly the EVO .46 are not as reliable to any other model engine I have ever owned. Granted they are being run reasonably hard around 16.5 on the ground and then they unload to over 17K In flight. They do not pick up the RPM we see with the TT in the same conditions. While running the EVO I have had the case crack, a wrist pin break and a connecting rod break. Between my engine and the ones on my racing team. I had Horizon replace the one with the broken Crank case. The engines were no longer being supported for the other two failures.
Sparky