Presentation on Petrol Engine
- 1. Roll No:14ME112 Syed Ashraf Ali Shah Rizvi Mehran UET, Jamshoro Department of Mechanical Engineering
- 2. What is an Engine? An ENGINE is a machine used to convert HEAT ENERGY into MECHANICAL ENERGY.
- 4. PETROL ENGINE A petrol engine (known as a gasoline engine) is an INTERNAL COMBUSTION engine with the spark ignition. So it is also known as spark ignition engine(S.I. Engine). Fuel used In a petrol engine is a gasoline ( Petrol ) and similar volatile fuel. The petrol engine works on principle of theoretically OTTO CYCLE.
- 5. OTTO CYCLE An OTTO cycle is an idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine. It is the thermodynamic cycle most commonly found in automobile engines.
- 6. There are TWO types of Petrol Engines - 4 STROKE PETROL ENGINE. - 2 STROKE PETROL ENGINE.
- 8. A FOUR STROKE PETROL ENGINE shown in figure. The valve operating the inlet is called inlet valve and the valve operating the exhaust is called exhaust valve. The spark plug fitted at the top of cylinder head initiates the ignition of the air fuel mixture. The piston performs four stroke to complete one working cycle. The four different strokes are; Suction stroke Compression stroke Power stroke Exhaust stroke
- 9. INTAKE STROKE INTAKE VALVE OPEN EXHAUST VALVE CLOSED PISTON GO TO TDC TO BDC AIR-FUEL MIXTURE ENTER IN TO THE CYLINDER
- 10. COMPRESSION STROKE INTAKE VALVE CLOSED EXHAUST VALVE CLOSED PISTON GO TO BDC TO TDC AIR-FUEL MIXTURE COMPRESSED IN TO THE CYLINDER
- 11. POWER STROKE INTAKE VALVE CLOSED EXHAUST VALVE CLOSED AIR-FUEL MIXTURE BURN INTO THE COMBUSTION CHAMBER PISTON GO TO TDC TO BDC
- 12. EXHAUST STROKE INTAKE VALVE CLOSED EXHAUST VALVE OPEN PISTON GO TO BDC TO TDC EXHAUST GAS OUT THROUGH THE EXHAUST VALVE
- 13. THE WORKING OF 4 - STROKE PETROL ENGINE. Exhaust valve Inlet valve Petrol and air mixtureExhaust gases TDC BDC Spark plug
- 15. •As the name itself implies, all the processes in two stroke cycle engine are completed in two strokes. In two stroke engine cycle operations suction , compression , expansion and exhaust are completed in one complete revolution. These engines have one power stroke per revolution of the crank shaft. Two-stroke engines do not have valves, which simplifies their construction and lowers their weight.
- 17. Major parts •CYLINDER •PISTON •CRANK SHAFT •ENGINE VALVE •CONNECTING ROD •CAM SHAFT •SPARK PLUG
- 18. Cylinder in the ENGINE is
- 19. Piston in the ENGINE is
- 20. Crankshaft in the ENGINE is
- 21. Engine valve in the ENGINE is
- 22. Connecting rod in the ENGINE is
- 23. Camshaft in the ENGINE is
- 24. Spark Plug in the ENGINE is
- 25. Advantages of Petrol engine High engine speeds of about 3000 rpm. Lighter in a weight because maximum pressure and temperature is less. Less initial cost. Less maintenance cost. Disadvantages of Petrol engine low compression ratio ranging from 6 to 10. The thermal efficiency is lower due to lower compression ratio. Running cost higher because petrol is costly.