Engine cylinder block
Engine cylinder block：
A cylinder is the central working part of a reciprocatingf engine or pump . the space in which a piston travels.Multiple cylinders are commonly arranged side by side in a bank, or engine block, which is typically cast from aluminum or cast iron before receiving precision machine work. Cylinders may be sleeved (lined with a harder metal or sleeveless (with a wear-resistant coating such as Nikasi ).
A cylinder's displacement, or swept volume, can be calculated by multiplying its cross-sectional area (the square of half the bore by pi ) and again by the distance the piston travels within the cylinder (the stroke). The engine displacement can be calculated by multiplying the swept volume of one cylinder by the number of cylinders.
Block material should be sufficient strength, good castability and machinability, 、
and the price is lower, therefore the cylinder material is commonly cast iron, alloy cast iron.
However, more and more common use of aluminum cylinder,
because the aluminum alloy cylinder, light weight, good thermal conductivity, the cooling fluid volume can be reduced
Material: gray cast iron cylinder head or alloy cast iron, aluminum thermal conductivity as well to improve the compression ratio,
so in recent years adopted aluminum alloy cylinder head more and more.