Automobile knowledge

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...