Which two types of cylinder wall finishes are common in 4-stroke engines?

Prepare for the EETC Four Stroke Engine Test. Utilize multiple-choice questions with insights and explanations. Master essential engine concepts and get exam-ready now!

In four-stroke engines, cylinder wall finishes play a significant role in ensuring proper lubrication and sealing, which directly affects engine performance and longevity. The cross hatch finish is a common technique used to prepare the cylinder walls. It involves creating a pattern of intersecting lines, which promotes the retention of oil, facilitates better piston ring sealing, and aids in reducing wear on both the rings and the cylinder walls.

On the other hand, diamond bore finishes, which use a specialized honing technique, are also increasingly common. This method provides a very smooth surface while maximizing the ability for the oil to adhere to the walls due to microstructures left on the surface. This enhances both lubrication and wear resistance.

Choosing cross hatch and diamond bore as the correct answer is appropriate because both finishes are designed to improve the performance characteristics of the engine through better oil control and reduced friction, making them essential for efficient operation in modern four-stroke engines.

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