If an engine fails (spoils) during a dyno run, it usually means the motor was pushed beyond its safe limits under controlled but extreme load conditions. Dyno testing stresses an engine at wide-open throttle, making any weak points show up quickly. ⸻ ⚡ What Can Happen During Dyno Failure 1. Catastrophic failure • Thrown rod or piston: Metal parts break through the block (“windowed block”). • Seized engine: Bearings overheat and lock the crankshaft. 2. Head gasket failure • Coolant and oil mix, w