Which of the following is not a factor affecting the performance of a steering system?

The type of engine used in the vehicle is not a factor that directly affects the performance of the steering system. Steering performance is primarily influenced by components directly related to the steering system and its operation, such as the wear of steering components, the balance of tires, and the fluid level in the power steering system.

Wear of the steering components can lead to looseness, play, and less precise control, negatively impacting steering performance. The balance of tires is critical because unevenly balanced tires can cause vibrations and affect how the steering feels, making it more difficult to control the vehicle. Finally, the fluid level in the steering system is essential for hydraulic systems; insufficient fluid can lead to steering difficulties, such as harder steering or loss of assist.

In contrast, while the engine may influence vehicle dynamics in a broader sense by affecting weight distribution or overall handling characteristics, it does not play a direct role in how well the steering system operates. Therefore, the engine type is not a direct factor affecting steering system performance.