I have the same problem: when flying online/IVAO some time after takeoff burn one or both engines. I have disabled the failures in X-plane, but every fly online/IVAO i have a troubles with engines & equipment. For example, the engines can burns at any time and any conditions: when my aircraft at FL200 at 50% torque, when descend at 30% torque, etc. It is impossible to me to understand when and why engines burn. Please help, what could be the reason?