Four-Stroke Engine Assembly

A four-stroke cycle engine is an internal combustion engine that utilizes four distinct piston strokes (intake, compression, power, and exhaust) to complete one operating cycle. The piston makes two complete passes in the cylinder to complete one operating cycle. The four strokes of the engine 1. Intake Stroke 2. Compression Stroke 3. Power Stroke 4. Exhaust Stroke. Four-stroke engines consist of the following parts: Cylinder: It is the heart of the engine. The piston reciprocates in the cylinder. Cylinder head: It is the top cover of the cylinder, towards TDC, which is called the cylinder head. Piston: It is the reciprocating member of the engine. It reciprocates in the cylinder. Piston rings: Two or three piston rings are provided on the piston. It seals the gap between the cylinder liner and piston. Crank: It is a rotating member. It makes a circular motion inside the crankcase. Crankcase: It is the housing of crank and other engine parts. It is also used as the sump of lubricating oil. Connecting rod: It is used to convert the reciprocating motion of the piston to rotary motion of the crankshaft. Crankshaft: It is the rotating member, which connects the crank. Cooling fins or Water jackets: It is used for cooling purposes. Cam and Camshaft: It is provided to operate the opening and closing of the Inlet and Exhaust valve and also operate the fuel injection pump in the Diesel engine. Inlet valve: This valve controlled the admission of charge or air inside the engine cylinder. Exhaust valve: This valve controls the removal of burnt gas after combustion. Intake manifold: This is a passage that carries the fresh charge or air. Exhaust manifold: This a passage through which the exhaust gas goes out of the engine cylinder. Spark plug: It is used in a Petrol engine or SI engine to ignite the fuel. Fuel injector: It is used in a Diesel engine or CI engine to sprayed the fuel inside the engine cylinder. Carburetor: It is used in a Petrol engine to mix the air-fuel properl