The cylinder liner of the engine is a metal sleeve inside which the piston moves. Inside the liner occurs a working cycle of compression of the fuel mixture and expansion of the gases that move the piston. The liner is one of the most loaded parts of the car. The piston, moving inside the sleeve, presses on it with tremendous force. The sleeve must have high strength, wear resistance, rigidity. The inner surface is brought to a mirror state. The material for the sleeves is cast iron with the addition of chromium, molybdenum, phosphorus, vanadium, and copper.

There are two types of cylinder liners – a wet-type and a dry-type. What is the difference between them?

Wet cylinder liner is washed by the coolant directly. There may be a cooling water space between liner and the engine block. Also wet cylinder liners may have integral cooling passages. This type of liner sometimes called water-jackets liners.

Dry cylinder liner does not contact with coolant. It is placed in the cylinder block, installed into the wall of the cooling jacket. If compare it with the wet liners, it has thinner walls. Dry liners are either pressed (Pressfit type) or inserted (Slipfit type) directly into the engine block.

Piston is an engine component that has a cylindrical shape and slides back and force by forces produced during the burning process. The piston is a movable end of the combustion chamber. The other part of the combustion chamber is stationary and called the cylinder head.

Pistons usually made of cast aluminum alloys that provide excellent ability to transfer heat. During heating aluminum expands and it is very important for the pistons to have proper clearance to maintain free movement. If the clearance is insufficient it can cause a compression loss.

Piston rings are open rings that, with a small gap (up to several hundredths of a millimeter), are seated in grooves on the outer surfaces of the pistons in piston engines (such as internal combustion engines or steam engines) and piston compressors.

Piston rings are small parts of the engine but they are expensive to replace. On our website piston rings price starts from €12 and goes up to €500 – it all depends on your car make and model.