11 February 2017

Advantages and disadvantages of two stroke engine

A two-stroke cycle engine is a type of internal combustion engine that completes a single crankshaft revolution power cycle with two-piston strokes. This engine provided some advantages and disadvantages comparing with a four-stroke engine. Let us have a deep insight into the pros and cons of the two-stroke engine in this article.   

Advantages of two-stroke engine : 

  • Simpler in design because don't have valve only port.
  • Power developed is twice as compared to same dimensions four-stroke engine with the same operating speed.
  • The work required to overcome the friction of the exhaust and suction strokes is saved.
  • Burnt gases do not remain in the clearance space because of scavenging.
  • Two-stroke engines can work in any position since oil flow is not a concern with any valves to worry about.
  • It occupies lesser space.
  • Lighter in weight because the lighter flywheel is used.
  • Easy to maintain.
  • Less cost.
  • It produces Uniform torque.
  • Power to weight ratio is high.

Disadvantages of two-stroke engine : 

  • A high-speed two-stroke engine is less efficient.
  • When the inlet valve of the engine is opened for the intake of the air-fuel mixture, the exhaust valve is also open so the part of the fuel is wasted this increase fuel consumption and reduce overall efficiency.
  • Effective compression is less in case of a two-stroke engine.
  • These engines are liable to cause heavier combustion of lubricating oil.
  • With heavy loads, it gets heated due to excessive heat produced.
  • Thermal efficiency is also less.
  • It causes pollution and smoky.