Cylinder liners are important components of engine blocks as they minimize the damage incurred by it over a period of time. In addition, they facilitate two of its most important functions i.e. conduction of heat (to the coolant) and the even distribution of produced energy throughout the engine circuit. For acquiring these traits, cylinder liners are composed of a mixture of elements that are unique to itself and completely different from the ones used in cylinder blocks or jackets. However, that’s not all. Cylinder liner exporters also highlight other reasons for such a difference in the chemical combination of cylinder liners and jackets. Some of these can be enumerated as follows:
- Increased Resistance to Physiochemical Degrading Agents
Liners reduce the intensity of corrosion, abrasive wear, and frictional force by taking up its effects on itself. Hence, unlike cylinder jackets, liners are needed to have a longer resistance towards all the degrading agents to ensure efficient internal mechanism in the engine block for long times.
- Active Life Differences
While liners can be replaced with time and even renovated with newer engineering technologies, cylinder jackets cannot be changed frequently or developed for producing much difference. Hence, cylinder jackets are made of elements that have high tensile strength, ductility, and life, but liner elements are carefully chosen to increase its physiochemical capabilities.
- Preventing Undue Thermal Stresses
During operation, the temperature of a liner and the cylinder jacket are different, with the former being hotter than the other. If the jacket and the liner of a cylinder are carved out of the same elements, their expansion during temperature rises can cause uncontrollable thermal stresses in the block, thereby making way for fractures or breakages in the engine components.
To achieve the functions mentioned above, a diverse range of elements is used in the making of liners. Cylinder liner exporters often hand out an instruction book that contains all the list of ferrous and non-ferrous elements that have gone in the making of their cylinder liner. So, here is a list of some of the elements that are commonly used by nearly all liner manufacturers:
- Cast Iron
Even though it is the most basic and primitive form of iron (ductile iron being a more popular choice) the use of cast iron in cylinder liner productions is immensely important. It is the singular element that is as high in terms of its physical strength as its porousness. This allows manufacturers to efficiently shape liners to any size while ensuring that the final product does not lose its ability to decrease piston seizures and extensive galling.
It is a rare element that is used to coat the inner surfaces of the liner. Its basic function involves increasing the mechanical properties (ductility, tensile strength, etc.) of the liners.
It is used in minute amount for providing textural hardness to the final product supplied by cylinder liner exporters. In addition, it also improves the endurance of the liner to corrosive agents.
This non-ferrous element is an unlikely component of liner that prevents the formation of white cast iron, as a result of chemical processes, in the block. Rather, it increases the production of the desired grey cast iron.
There are a number of cylinder liner exporters is the market today. And one must be careful while purchasing cylinder liners from any of the available sellers because the quality of the product offered by each may vary incredibly. While the liner elements remain the same, their concentration in its mixture determines its quality. Hence, one should keep considerable knowledge about the engine components handy for himself/herself while going for purchasing cylinder liner.