Four stroke petrol engine diagram

If you are interested to know about four-stroke engines, then this article will help you to understand in an easy way. Single cylinder 4-stroke engine working can be understood by knowing the process which consists of 4 number of strokes. The engine does two cycles of the crankshaft by completing four strokes of the engine i.e. suction, compression, expansion, and exhaust. Introduction: Currently, huge applications in the automobile industry, power generators, water pumps, lawn movers, etc. are working on the principle of four stroke engines. • Stroke: It is the travel of the piston from TDC to BDC of the cylinder block. • T.D.C.: Top dead center is the position of the piston nearest to the cylinder head. • B.D.C.: bottom dead center is the position of the piston farthest to the cylinder head. The four strokes of the piston are complete within two revolutions of the crankshaft. The working of four stroke engine consists of four strokes of piston and two crank revolutions. • 1 st stroke (Suction stroke): In this stroke fresh charge of air or air-fuel mixture is taken inside. For this process piston moves from TDC to BDC. • 2 nd stroke (Compression stroke): The fresh charge is compressed by moving the piston from BDC to TDC. • 3 rd stroke (Expansion Stroke): It is also known as the power stroke. In this stroke compressed charge is combusted which generates high-pressure hot gases inside of a cylinder. It pushes the piston from TDC to BDC In this process hot gases are expande...

Four Stroke petrol engine FOUR STROKE PETROL ENGINE refers to its use in petrol engines, gas engines, light, oil engine and heavy oil engines in which the mixture of air fuel are drawn in the engine cylinder. Since ignition in these engines is due to a spark, therefore they are also called spark ignition engines. In four stroke cycle engine, cycle is completed in two revolutions of crank shaft or four strokes of the piston. Each stroke consists of 1800 of crankshaft rotation. Therefore, the cycle consists of 7200 of crankshaft rotation. Cycle consists of following four strokes 1) Suction Stroke 2) Compression Stroke 3) Expansion or Power Stroke 4) Exhaust Stroke SUCTION STROKE: In this Stroke the inlet valve opens and proportionate fuel-air mixture is sucked in the engine cylinder. Thus the piston moves from top dead centre (T.D.C.) to bottom dead centre (B.D.C.). The exhaust valve remains closed through out the stroke. COMPRESSION STROKE: In this stroke both the inlet and exhaust valves remain closed during the stroke. The piston moves towards (T.D.C.) and compresses then closed fuel-air mixture drawn. Just before the end of this stroke the operating. plug initiates a spark which ignites the mixture and combustion takes place at constant pressure. 4 stroke petrol engine animation POWER STROKE OR EXPANSION STROKE: In this stroke both the valves remain closed during the start of this stroke but when the piston just reaches the B.D.C .the exhaust valve opens. When the mixtur...

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• Home • About Us • Subscribe Here! • Site Map • MECHANICAL ENGINEERING • Machine Design • Metrology • Material Science • I.C Engines • Fluid Mechanics • Engineering Calculators • Motor Torque • Section Modulus • Area Calculator • Shaft Diameter • Stiffness Calculator • Inertia Calculator • More • Unit Converters • Torque • Power • Force • Energy • Inertia • Area • More • Strength of Materials • Theory of Machines • Advanced Composites • Product Design • Production Technology • CAD/CAE/CAM • PTC CREO • SOLIDWORKS • CATIA V5 The closing and the opening of the valves will be operated by a camshaft. The cycle of operation of a 4 Stroke Engine consists of the following processes: • Suction or intake stroke, • Compression stroke, • Expansion or power stroke, • Exhaust stroke. Valve Timing Diagram The above processes will be operated with the sequence of operations of the valves in the Four-stroke engine. This relation between the valve opening timings to the piston moves from the Top Dead Centre (TDC) to the Bottom Dead Centre (BDC) can be represented on a circle. This is called the Valve Timing Diagram. The following theoretical Valve Timing diagram will illustrate how the events such as the Inlet valve and Exhaust Valve are open and closes in an ideal cycle. See the below Theoretical Valve Timing Diagram for the Theoretical Valve Timing Diagram for 4 Stroke Diesel Engine The above diagram represents the valve timing for the ideal Engine. But in reality, the opening/closing of...

In this article, we will discus about 4 Stroke Engine Working Principle, Diagram. An engine is a device, that converts the energy in a fuel into heat energy and the heat energy into mechanical energy. Before discussing the Four-Stroke engines, we should know the working principle of an IC engine. In an IC engine, a mixture of fuel with the correct amount of air is exploded in the engine cylinder. This engine cylinder is closed at the one end. Because of this explosion, the heat is released and this heat causes the pressure of the gases to increase. Then this pressure is exerted on the piston and the piston moves down the cylinder. Then this moment of the piston is transmitted to the crankshaft and this crankshaft is connected to the piston by a connecting rod. So when the crankshaft rotates it turns the flywheel that is connected to it. If you want a continuous rotation of the crankshaft then there should be an explosion in the Inside of the cylinder continuously but before the explosion, the exhaust gases should be exhausted from the cylinder and fresh air should be admitted into the cylinder. That is how the piston moves back and forth. The sequence of the events taking place in an engine is called the working cycle of the engine. Terms Associated with the Bore- The bore is the internal diameter of the cylinder. Stroke- The stroke of a cylinder is defined as the maximum distance it can move either towards the upper limiting position or lower limiting position. Top Dead C...