KNOW WHY 2 STROKE ENGINES ARE USED IN SHIPS !!

Although 2 Stroke Engines create a lot of noise and pollution but still ship engine uses 2 stroke engine for their propulsion.Let us know the reason behind this:

1.)Fuel Selection: 

High grade fuel are more costly as compared to low grade fuel.A two stroke engine can burn low grade fuel oil and hence reduce running cost of the ship.

2.)High Torque:

 2 stroke engine has more torque at low rpm than the 4 stroke. The ship needs the higher torque to keep a constant speed at the lower engine speed. So the ship can cruise at a constant speed without having to constantly adjust the engine speed.

3.)Power:

Most of the 2 stroke engines are now large stroke engines that produce more power. Hence they have high power to weight ration as compare to 4 stroke engine.

4.)Reliability:

Two stroke engines are more reliable in operation as compare to 4 stroke engine.

5.)Less Maintenance:

Due to absence of valve mechanism,the maintenance requirement of two stroke engine is much lesser than 4 stroke engine.

6.)No reduction attachments: 

As two stroke engines are low speed engine, there are no requirement of reduction gear or speed reduction arrangement as required for high speed four stroke engine.