Cylinder Barrel

-
Cylinder barrel  are made of light and high-strength material and have the proper characteristics for operating under high temperatures. It must be made of a good bearing material and have high tensile strength. 
Cylinder barrel is made of a steel alloy forging with the inner surface hardened to resist wear of the piston and the piston rings which bear against it. 
Hardening is usually done by exposing the steel to ammonia or cyanide gas while the
steel is very hot. The steel soaks up nitrogen from the gas,which forms iron nitrides on the exposed surface. As a result of this process, the metal is said to be nitrided. 
Nitriding only penetrates into the barrel surface a few thousands of an inch. As the cylinder barrels wear due to use, they can be repaired by chroming. This is a process that plates chromium on the surface of the cylinder barrel and brings it back to new standard dimensions. 
Chromium-plated cylinders should use cast iron rings. Honing the cylinder walls is a process that brings it to the correct dimensions and provides crosshatch pattern for seating the piston rings during engine break-in.
Cylinder barrels are choked at the top, or they are smaller in diameter to allow for heat expansion and wear.
Barrel may has threads on the outside surface at one end so that it can be screwed into the cylinder head. 
Cooling fins are machined as an integral part of the barrel and have limits on repair and service.

Comments

Post a Comment

Popular posts from this blog

Cylinder Head

-
Cylinder head   provides a place for  combustion of the fuel/air mixture and to give the cylinder  more heat conductivity for adequate cooling. The fuel/air  mixture is ignited by the spark in the combustion chamber  and commences burning as the piston travels toward TDC  on the compression stroke. The  ignited charge is rapidly expanding at this time, and pressure  is increasing so that, as the piston travels through the TDC  position, it is driven downward on the power stroke. The intake and exhaust valve ports are located in the cylinder  head along with the spark plugs and the intake and exhaust  valve actuating mechanisms. After the cylinder head is cast, the spark plug bushings, valve  guides, rocker arm bushings, and valve seats are installed in  the cylinder head. Spark plug openings may be fitted with bronze or steel bushings that are shrunk and screwed into  the openings.                  Stainless steel Heli-Coil spark plug inserts   are used in many engines currently m
Read more

Cylinder

-
Image
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:   cylinder head and  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 an
Read more