Why Select 2-Strokes?

In our previous publication, we touched on the subject 
of 2-stroke diesel engines. Today, we ask why we choose 
to use 2-strokes?

As you might remember, for a 2-stroke engine, the piston 
has to move up, and then down to complete one cycle of 
the engine. In those 2 strokes of the piston, the 
crankshaft will have turned 1 revolution. In those 2 
strokes of the piston the engine has also completed 
4 stages of the combustion cycle - air intake, 
compression, combustion and exhaust.

Now, compare that with a 4-stroke engine. The piston 
moving down will complete the air intake stroke. When it 
moves up again, the piston completes the compression 
stroke. Next comes the injection of fuel. Combustion 
takes place. The piston is forced to move down by the 
pressure of the gases. When the piston moves up again, 
it drives out all the exhaust gases in the exhaust stroke.

The piston in a 4-stroke engine will move 4 strokes in 
order to complete the 4 stages of the combustion cycle 
- air intake, compression, combustion and exhaust.

The power developed in a 4-stroke engine is based on the 
formula,

Power = PLAN/2, where,

P is the mean effective pressure inside the cylinder,

L is the stroke length of the piston travel,

A is the cylinder bore or the area of the piston top,

N is the number of revolutions per unit time.

In a 2-stroke engine, because the power is developed in 
the same revolution, the formula for Power becomes,

Power = PLAN

This means that with the same mean effective pressure, 
stroke length and bore (area), the 2-stroke engine can 
develop twice the power of a 4-stroke engine!

If size, weight, and material cost are causes for 
concern, the 2-stroke engine has the clear advantage.

Well folks, 2-strokes have the advantage of higher 
power with small size. However, there are some 
disadvantages too. That could be discussed later...

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Thomas Yoon's skill in illustration/writing has enabled him to produce numerous ebooks on engineering subjects that can be downloaded at Engineering E-books. He has also produced an ebook on "50 Secrets of Truth and Life" that is fully illustrated with cartoons in a humorous way. Subscribe to facworld ezine More information at Marine Engineer andM & E Engineer Article Source: http://EzineArticles.com/?expert=Thomas_Yoon