Skip to main content

Petrol Engine (Gasoline Engine)

Hello friend's in this post we talk about Petrol Engine.

The engine which gives power to propel the modern Indian automobile is a petrol-burning, spark-ignition four-stroke cycle, internal combustion engine. Petrol is a liquid fuel and is called by the name gasoline in America. That is why the petrol engines are also known as gasoline engines. The ability of petrol to furnish power rests on the two basic principles of physics: 

1. Burning or combustion is always accompanied by the production of heat. 
2. When a gas is heated, it expands. If the volume remains constant, the pressure rises according to Charle's law. 

The operation of petrol engine in the production of power may be described as follows: 
During the downward motion of the piston, the air fuel mixture is sucked from the carburettor into the cylinder. During the upward motion the mixture is compressed by the piston in the cylinder and ignited by an electric spark. When the mixture is burned in the cylinder, the resulting heat causes the gases to expand which exert pressure on the cylinder walls and on the piston. The piston, being movable, is pushed downward by this pressure to the full length of its stroke. 
The pressure exerted on the piston is transmitted through the connecting rod to the crankshaft that is made to revolve. 
The arrangement is shown in Fig. 3.1. 
The crankshaft turns through one-half of a revolution as the piston moves downward. A flywheel attached to the crankshaft stores up energy. The momentum of the flywheel carries the piston through the balance of its motion until it receives another power impulse. The process is repeated over and over again, the crankshaft is turning continuously and the engine is running. 
The events that are repeated make up the cycle of the engine. The number of strokes of the piston required to complete the cycle varies with the type of engine. In modern Indian passenger cars, the cycle is extended through four strokes of the piston or two revolutions of the crankshaft. This is called a four-stroke cycle engine. In two-stroke cycle engines, the cycle is completed in two strokes of the piston or one revolution of the crankshaft. In the four-stroke cycle engine, the four strokes are named suction, compression, power and exhaust in accordance with the operation of the cycle which occur during each particular stroke.

Comments

Post a Comment

Popular posts from this blog

VALVE TIMING DIAGRAM OF A FOUR-STROKE, OTTO CYCLE ENGINE

Hello friend's in this post we will talk about valve timing diagram of a four stroke, otto cycle engine It has already been explained in the operation of four stroke, Otto cycle engine that the inlet valve opens during the suction stroke and the exhaust valve opens during the exhaust stroke. The exact moment at winch each of the valves opens and closes with reference to the position of piston and crank can be shown graphically in a diagram. This diagram is known as valve timing diagram. Theoretically, the inlet valve opens exactly at the beginning of suction stroke and closes at the end of the stroke. Both the valves remain closed during compression and power strokes. The exhaust valve opens exactly at the beginning of exhaust stroke and closes at the end of stroke. The theoretical valve timing diagram for a four-stroke Otto cycle engine is shown in Fig. 3.3. The opening and closing of valves with reference to the position of piston and crank shaft during the four strok...
Post a Comment
Read more

PRESSURE-VOLUME DIAGRAM OF FOUR-STROKE, OTTO CYCLE ENGINE

Hello friend's in this post we will talk about pressure - volume diagram of four - stroke, otto cycle engine Fig. 3.8 shows theoretical p-v diagram of a four-stroke Otto cycle engine. During the suction stroke, the charge is admitted in the cylinder increasing the volume from 1 to 2, at the atmospheric pressure. Cylinder volume is the sum of clearance volume and stroke volume. During the compression stroke, the charge is compressed from 2 to 3. Volume decreases to clearance volume and pressure rises. The compressed charge is ignited at constant volume, which increases the pressure as represented by 3- 4 line. During the working stroke the volume increases and pressure decreases as represented by 4-5line. At 5, the exhaust valve opens and exhaust takes place at constant decreases the pressure suddenly as represented by 5-2 line. Finally the piston moves onward rushing out the exhaust gases at atmospheric pressure as represented by 2-1 line. The volume again decreases to clearance vo...
Post a Comment
Read more

History of Automobile

Hello friend's, so in this post we will talk about the history of Automobile. In 1769, Captain Nicolas Cagnot, a French engineer, built the first road vehicle powered by his power. It was a three-wheeler, four-seater vehicle fitted with a steam engine.  It achieved a speed of about 2 m.p.h.  For 15 minutes. In 1880, German and French efforts developed an internal combustion engine vehicle, which was used to carry fruits.  The current vehicle is a development of this vehicle. In 1885, Benz in Germany built a tricycle powered by an internal combustion engine. In 1885 - 1886, Gottlieb Daimler patented an internal combustion engine in Germany and a year later it was running in a vehicle, In 1895, Charles E. in America.  Duria and Ellwood J.  Hans developed experimental automobiles.  In this year, Panhard and Levassor in France also developed a car which, with minor exceptions, incorporated the main features of the automobile as we know it today. In 1890 - 1895,...
Post a Comment
Read more