What are the wear patterns and causes of cylinder bores?
2 Answers
Under normal wear conditions, it exhibits characteristics of uneven wear. The following is an introduction to cylinders: 1. Introduction: A cylinder is a cylindrical chamber within an engine where a piston is driven by the pressure or expansion force of the working fluid, and in some special types of engines, there may be similar but non-cylindrical parts. 2. Types: In pneumatic transmission, cylinders are pneumatic actuators that convert the pressure energy of compressed gas into mechanical energy. Cylinders can be divided into two categories: those performing reciprocating linear motion and those performing reciprocating swinging motion. Reciprocating linear motion cylinders can be further classified into four types: single-acting, double-acting, diaphragm-type, and impact cylinders.
Having driven for decades, I've noticed that cylinder bore wear generally follows a predictable pattern. The upper part of the cylinder, especially near the top where the piston moves up and down, tends to wear more due to the highest pressure and temperature. The lower part experiences less wear. The main reason, simply put, is excessive friction. When dust and impurities mix into the engine oil, they act like sandpaper against the cylinder walls. Insufficient lubrication leads to thinner oil films, causing direct metal-to-metal contact and faster wear. Additionally, high engine temperatures cause materials to expand and deform, making scratches more likely. I've seen many older cars smoke or lose power because of this issue. To reduce wear, it's essential to change the oil and air filters regularly, avoid prolonged engine overload, and stick to scheduled maintenance—this can significantly extend the engine's life. Otherwise, repairs can be costly.
