How many degrees of rotation are needed to complete a full cycle on a nine cylinder engine?

In a nine-cylinder engine, each cylinder must complete its power cycle, which typically includes intake, compression, power, and exhaust strokes. A single complete cycle for a four-stroke engine requires two revolutions of the crankshaft. This is because each cylinder fires once every two revolutions.

Since the engine has nine cylinders, and each completes a cycle in 720 degrees of crankshaft rotation (2 x 360 degrees), the total degrees of rotation to ensure all cylinders have gone through their complete power cycle is indeed 720 degrees. Therefore, the answer is correct as it reflects the need for the engine to rotate fully twice to complete all cylinder cycles.