What are the reasons for high cylinder pressure in the T-Roc EA211 engine?

[DelJosiah]

The main reasons for high cylinder pressure in the T-Roc EA211 engine are excessive carbon deposits in the combustion chamber, or excessive grinding of the cylinder block and cylinder head mating surfaces during repair, resulting in a too small combustion chamber volume and excessively high compression ratio. Wear areas: Under normal circumstances, the wear along the working surface of the cylinder in the piston ring movement area is an irregular cone shape that is larger at the top and smaller at the bottom along the height direction. The most severe wear occurs on the cylinder wall corresponding to the first piston ring when the piston is at top dead center. The upper edge of the cylinder that does not contact the piston ring shows almost no wear and forms a distinct cylinder shoulder. Mechanical wear: When the piston is at top dead center, the high-temperature gas explosion pressure is greatest, causing the piston ring's positive pressure on the cylinder wall to increase, friction to increase, and the lubricating oil film to be destroyed. The cylinder wall corresponding to the first piston ring experiences the most severe wear.