What are the causes of excessive cylinder pressure?

[SebastianLynn]

Causes of excessive cylinder pressure mainly include excessive carbon deposits in the combustion chamber, or excessive grinding of the cylinder head and cylinder block mating surfaces during repairs, leading to a reduced combustion chamber volume and an excessively high compression ratio. A cylinder is a cylindrical metal component that guides the piston in linear reciprocating motion. The working medium converts thermal energy into mechanical energy through expansion in the engine cylinder; gas in the compressor cylinder is compressed by the piston to increase pressure. The housings of turbines, rotary piston engines, etc., are also commonly referred to as "cylinders." Based on structural characteristics, cylinders are mainly classified into two types: piston cylinders and diaphragm cylinders; according to the form of motion, they are divided into linear motion cylinders and swing cylinders.