At what speed does the camshaft of a horizontally opposed four-stroke engine rotate?

In a horizontally opposed four-stroke engine, the camshaft is designed to rotate at half the speed of the engine itself. This is because a four-stroke engine completes one power cycle with every two revolutions of the crankshaft. Since the camshaft is responsible for opening and closing the engine's valves, it needs to operate in sync with the crankshaft to align with the piston positions correctly.

During each complete revolution of the crankshaft, the camshaft only needs to turn once to operate the valves appropriately at the correct intervals. Therefore, for every two rotations of the crankshaft (which corresponds to one power cycle), the camshaft completes one complete turn. This relationship between the timing of the crankshaft and camshaft is essential for the efficient functioning of the engine, allowing for proper valve timing and performance.

This makes the answer of the camshaft rotating at half the engine speed accurate for horizontally opposed four-stroke engines.