Cylinder Sleeve or Bore:

Diesel engines use one of two categories of cylinders. In one category, every cylinder is simply machined or bored within the block casting, making the block and cylinders an integral part. In the second categories, a machined steel sleeve is pressed into the block casting to form the cylinder. Above figures gives examples of sleeved diesel engines. Along with either method, the cylinder sleeve or bore provides the engine within the cylindrical structure required to confine the combustion gasses and to act as a guide for the engine's pistons.

Within engines using sleeves, there are two categories of sleeves, dry and wet. A dry sleeve is surrounded through the metal of the block and does not come in direct contact along with the engine's coolant (water). A wet sleeve comes within direct contact along with the engine's coolant. Figure gives an instance of a wet sleeve. The volume enclosed through the sleeve or bore is known as the combustion chamber and is the space where the fuel is burned.

In other type of cylinder, bored or sleeved, the diameter of the cylinder is known as the bore of the engine and is begins in inches. For instance, the bore of a 350 cubic inch Chevrolet gasoline engine is 4 inches.