FOUR STROKE DIESEL ENGINE / COMPRESSION IGNITION (CI) ENGINE
FOUR STROKE DIESEL ENGINE Constructional details A four stroke diesel engine consists of a cylinder with its one end fitted with a cover and the other end left open. The cover is provided with the inlet and exhaust valves. These inlet and exhaust valves are opened and closed by mechanically operated cams. The fuel injector is fitted at the top of the cover to atomize the fuel. A piston carrying rings reciprocates inside the cylinder. The piston is connected to the crankshaft through a connecting rod and crank. It converts the reciprocating motion of the piston into rotary motion. WORKING Suction or intake stroke Suction stroke starts when the piston is at the top dead centre and about to move downwards. At that time, the inlet valve is opened and exhaust valve is closed. Due to the downward movement of the pisto, partial vaccum is created inside the cylinder. (i.e. the volume in the cylinder increases while the Pressure decreases). Due to the pressure difference between the
