Four stroke engine
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The document discusses the four-stroke and two-stroke internal combustion engine cycles. The four-stroke cycle involves intake, compression, power, and exhaust strokes in two revolutions, while the two-stroke cycle completes these strokes in one revolution. Two-stroke engines are lighter, more powerful, and less expensive but are less efficient and more polluting than four-stroke engines. Four-stroke engines are more complicated with more parts but are more efficient, last longer, and pollute less. Internal combustion engines are widely used in vehicles, locomotives, aircraft, marine applications, lawn equipment, and industrial stationary equipment.
Four stroke engine
- 2. OTTO CYCLE
- 6. POWER STROKE
- 9. TWO STROKE ADVANTAGES ?Is less expensive because of its simpler design. ?The engine fires - spark plug ignites - once every revolution of the crankshaft. ?They produce twice the power than four stroke engines. ?Packs a higher weight-to-power ratio because it is much lighter.
- 10. TWO STROKE DISADVANTAGES ?They last less. Lubrication is not as efficient as in a four-stroke engine with heavy oil. ?Do not use gas efficiently. ?Pollute more. ?Faster wear and shorter engine life than a four stroke due to the lack of a dedicated lubricating system.
- 11. FOUR STROKE ADVANTAGES ?Last longer than two stroke engines ?More efficient use of gas ?Pollute less than two stroke engines
- 12. FOUR STROKE DISADVANTAGES ?More complicated. Many more parts to worry about. ?Half as powerful as two stroke engines (for equivalent engines) ?Fires once every two revolutions.
- 13. APPLICATION ?ROAD VEHICALS ?RAILWAY LOCOMOTIVES ?SMALL AIRCRAFTS ?MARINE ?HOUSE USE LAWN MOVER ?INDUSTRIAL, STATIONARY
- 14. CONCLUSION ? Further increase of power and torque · Further size and weight reductions · Further improved fuel economy · Further reduced emissions Further reduced manufacturing cost