Cylinder

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Cylinder - The portion of the engine in which the power is developed is called the cylinder provides a combustion chamber where the burning and expansion of gases take place, and it houses the piston and the connecting rod. 
Cylinder head of an air cooled engine is generally made of aluminum alloy because aluminum alloy is a good conductor of heat and its light weight reduces the overall engine weight.
Cylinder heads are forged or die-cast for greater strength. The inner shape of a cylinder head is generally semispherical. The semispherical shape is stronger than conventionalist design and aids in a more rapid and thorough scavenging of the exhaust gases
Cylinder used in the air cooled engine is the overhead valve type.  
Each cylinder is an assembly of two major parts: 

  1.  cylinder head and 
  2. cylinder barrel. 

At assembly, the cylinder head is expanded by heating and then screwed down on the cylinder barrel, which has been chilled. When the head cools and contracts and the barrel warms up and expands, a gastight joint results. 
The majority of the cylinders used are constructed in this manner using an aluminum head and a steel barrel.

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