Automobile knowledge

  VALUE 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 stroke and the exhaust valve opens during the exhaust stroke. The exact moment at which each of the valves opens and closes with reference to the position of the piston and crank can be show 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 close during power and compression stroke. The exhaust valve opens exactly at the beginning of exhaust stroke and closes at the end of the stroke. The theoretical valve timing diagram for a four stroke Otto cycle engine in shown in diagram. The opening and closing valves with reference to the position of piston and crank shaft during the four strokes are described as follow. 1.  ...

  HISTORY OF THE AUTOMOBILE 1. In 1769, a french Engineer captain Nicholas Cugnot, built the first vehicle propelled by its own Power 2. It was a three wheeler, four-seater vehicle fitted with a steam engine. It attained a speed of about 2 ½ m.p.h. for 15 minutes 3. In1880 , German and French efforts developed an internal combustion engine vehicle, which was used to carry fruits. The present day automotive is the development of this vehicle. 4. In1885 Benz in Germany built a tricycle propelled by an internal combustion engine. 5. In 1885-86, Gottlieb Daimler patented an internal combustion engine in Germany and a year later it was running in a vehicle. 6. In 1895, ChArles E. Duryea and Elwood J.Haynes in America developed experimental automobiles. In this year, Panhard and levassor in France also developed a car which, with minor exception, incorporated the chief features of the automobile as we know it today. 7. In 1890-1895, the European designers were also active in the develop...

Comparison between Four stroke and two stroke engines Four stroke engine Two stroke engine 1.One working stroke for every two revolution of crank shaft 1.One working stroke for each revolution of the crankshaft 2.Turning moment on the crankshaft is not due to one working stroke for every two revolution of the crankshaft Hence heavy flywheel is required & Engine runs unbalanced. 2.Turning moment of the crankshaft is more even due to one working stroke for each revolution of the crankshaft Hence lighter flywheel is required and engine runs balanced. 3. Engine is heavy . 3. Engine is light. 4.Emgine design is complicated. 4.Engine design is simple. 5.More cost . 5.Less cost . 6.less mechanical efficiency due to more friction on many parts. 6.More mechanical efficiency due to less friction on a few parts. 7.Mor...

Introduction : The modern petrol engines operate on Otto cycle this cycle was introduced by German scientist Otto in 1876. Although it was described by french scientist Beande Roches in 1862.  Mainly Four strokes in the Petrol engines. 1. Suction stroke. 2. Compression stroke. 3. Power (working, expansion) stroke 4. Exhaust stroke.       Suction stroke :     During this stroke the the piston moves downword by the crankshaft which is revolved by the momentum of the flywheel & the power generated by the electric motor the inlet valve remains open & exhaust valve is closed during stroke. The downword movement of the piston sucks the air- fuel mixture in the cylinder from the carburettor through the open inlet valve. And the petrol mixed with air, this stroke complete here now the process move the next stroke.       Compression stroke :     During the compression stroke the piston moves upward direction and compressing the...