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Parts of Engine -2

Hello friends,

Previous article we have discussed in cylinder block. In cylinder block are the round mirror cylinder surface by accurate grinding and honing process and this article we have discussed in cylinder head. so...let's start 🤔

2. Cylinder head: 
   
     The top of the cylinder is covered by separate cast piece know as the cylinder. the cylinder head is bolted to the top of the cylinder block. it contains combination chamber. In cylinder head are mounted on spark plug and sometimes valves are mounted in it and passages for flow of cooling water.
The cylinder head is usually made by gray cast iron or aluminium alloy. Aluminium has the advantage of lightness in weight and high heat conductivity. It is cast separately from the cylinder block, it may be removed for cleaning carbon and grinding valve. A flat piece of gaskets is placed between the cylinder head and cylinder block. Racing car engine, a separate head is not use. But single piece of cylinder block and head is difficult and costly to make.

Cylinder head are dependent upon the valve layout, carry the camshaft, Rocker and valves, water passage, are provided adjacent to valve and plug seatings.
Following points of view of heads are made:

1. The bore of the cylinder or liner should not be distorted by the pull of the holding down studs.
2. The circulation of coolant in the cylinder head should be carried as nearly as possible to the top end.
3. To ensure a sound gas tight joint , the holding down studs must be distributed as possible around the each cylinder.





















The popular side valve construction with all valves in line, the pistons closely approaches the flat portion of the cylinder head.
The reverse valve construction of the cylinder head which gives good volumetric efficiency.
The ideal hemispherical head which is used in many high performance design, the flame short and high compression ratio by piston crown.


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