Learn Automobile: Piston of Engine

Today we will learn about Piston which most important components of an engine, presenting by Mr. Sad Abdul Wasea. He is one of the team member of e-Learningbd.com, developing contents for e-Learning platform in English edition. Hope we will learn better things & better contents from Mr. Wasea.

Piston of engine

The machinery that contains the engines energy. It is used in any kind of vehicle, helicopter, Airplane, boat, steamer, ship etc most of the machines. And it is so much important and valuable element. It is moveable element that is contained by a cylinder and is made gas-tight by piston rings. The pistons are located in the cylinder block. The number of cylinders in an engine can vary.


Piston is a tubular piece of metal that moves up and down inside the cylinder. Inside the cylinder a composition of air and fuel is injected through the intake valve. Pressure in the cylinder is generated when the piston returns to the top of the cylinder from its previous cycle. When the pressure is greatest the spark plug, located at the top of the cylinder, ignites the gas and causes an explosion. The piston is the sent downward extremely fast. The energy travels through the connecting rod, which is connected to the bottom of the piston, and the linear motion is converted to rotational motion through the crankshaft. The crankshaft is connected to the transmission, so when the crankshaft turns, the wheels turn also.


In addition some engines, the piston also acts as a valve by covering and uncovering ports in the cylinder wall. Pistons are used for petrol, diesel or gas engines. Pistons come in many different materials and sizes that are based on the cylinder bore of the particular motor they are being installed in. Using the proper pistons is very important to get the proper fit in your engine block, as well as maintain the proper compression ratio.

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