What is the frequency of a crankshaft imbalance in an 8 cylinder when engine speed is at 600 rpm?

The frequency of a crankshaft imbalance in an 8-cylinder engine at 600 RPM can be calculated by considering the engine's firing order and the number of power strokes. In a typical 8-cylinder engine, there are 4 power strokes per revolution (since two cylinders fire every crankshaft revolution). Therefore, at 600 RPM, the frequency of the imbalance would be 600 RPM / 60 seconds = 10 Hz, and since there are 4 power strokes per revolution, the imbalance frequency would be 10 Hz x 4 = 40 Hz.