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Parts of engine -4

HELLO FRIENDS,

Previous article we have discuss parts of engine crankcase, cylinder liner and piston introduction. In this article we have discuss material  of  piston and piston  clearance.

So…..lets start,😊

 Material  for piston :

The material used for piston is mainly aluminium alloy. Aluminium piston can be either cast or forged. Cast iron is also used for piston. Yearly  cast iron was almost universal  material for piston because it's excellent  wearing qualities, co-efficient of expansion and general  suitability in manufacture. Due to reduce of weight of metal is necessary, light metal is lost. Aluminium is inferior to cast iron in strength and wearing qualities, and it's greater  co-efficient of expansion greater clearance in the cylinder to avoid the risk  of seizures.
The thermal heat conductivity of aluminium  is about three times that of cast iron and this combined  with greater thickness necessary for strength, enable an aluminium alloy piston to run at much lower  temperature than a cast iron.

Piston clearance :

 Piston are usually small in diameter then the bore of the cylinder. The space  between the cylinder and cylinder wall is called  the piston clearance.

Reason of piston  clearance:

1. Space for a film of lubricant between cylinder wall and piston to reduce friction

2. Very high operating temperature, piston and cylinder block expand. The cylinder is cooled better than the piston, hence sufficient clearance for piston to expand, failing which the piston seizures will result.

3. If there is no clearance between cylinder wall and piston, it will be impossible for the piston to reciprocate in the cylinder.

Piston clearance depands upon the size of the cylinder bore and the metal used in the piston. Generally 0.025mm to 0.100mm. This clearance is filled with oil so that the piston and rings move on films of oils. Proper  clearance  should  be maintained between  piston and cylinder wall. If the clearance is too small, then  will be loss of power from excessive friction,were and possible seizure of  the cylinder. If clearance is too much, then piston slap will result. Piston slap means sudden  tilting of the cylinder as the piston down  on the  power stroke. The cylinder  to other sufficient  force to produce a distinct noise.


in piston cylinder some details are show on the.... next aritical never miss....
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