Why,Select,Two,Strokes,amp,#63 car Why Select Two Strokes?
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In our previous publication, we touched on the subjectof 2-stroke diesel engines. http://www.free-engineering.com/fwezine26.htm .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 pistonmoving down will complete the air intake stroke. When itmoves up again, the piston completes the compression stroke. Next comes the injection of fuel. Combustiontakes place. The piston is forced to move down by thepressure 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 theformula, 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 inthe same revolution, the formula for Power becomes,P = PLANThis means that with the same mean effective pressure, stroke length and bore (area), the 2-stroke engine candevelop 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..."PRODUCE YOUR BEST WITH THE BEST!"Hard-to-find tools become easy-to-find.http://www.free-marine.com/linkeastwood.htm Article Tags: 2-stroke Engine, 4-stroke Engine
Why,Select,Two,Strokes,amp,#63