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What is a 2-stroke diesel engine?As the name suggests, these engines work on reciprocating actions of pistons. One stroke means one linear motion of the piston in one direction. When the piston moves in the opposite direction, that is counted as another stroke.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.The 2 strokes of the piston is to complete 4 stages of the combustion cycle - air intake, compression, combustion and exhaust. As you might have known, in order for a fire (or explosion) to occur to power the engine, we need a fuel, a heat source, and oxygen coming together at the same time.Remember how the crankshaft and the piston moves in a cylinder?The reciprocating movement of the piston is converted to rotarymotion by means of a crankshaft. The piston reciprocates between Top Dead Center and Bottom Dead Center inside the cylinder liner.One of the most prominent feature of a 2-stroke engine is thepresence of air intake ports on the cylinder liner that willenable fresh air to be led in for combustion.These air inlet ports are cut into the cylinder liner somewhere at the lower end of the latter. In a typical design, the air inlet port are located about 35 degrees from the Bottom Dead Center (BDC).In many designs, the fresh air that is introduced into the cylinder is also used to drive out the spent exhaust gases inside it. Many designs make use of scavenging air fans likeelectric blowers or turbochargers to slightly pressurize theintake air before the latter is introduced into the cylinder.In order to allow the exhaust gases to be expelled from the cylinder, exhaust ports are often cut into the cylinder just like the air intake ports. A typical design will have the exhaust port located about 50 degrees from Bottom Dead Center.So, let's describe our engine stages at the combustion spacebetween the piston top and the cylinder head.From Bottom Dead Center (BDC), the piston, full of fresh air, moves up the cylinder liner until it covers up the air intake port. The air intake process stops.The piston moves further up. It then covers up the exhaustport on the cylinder liner. The exhaust process stops.The piston moves further up. The air inside the combustionspace is compressed and becomes hot. The piston has nearlyreached Top Dead Center at this point.Highly atomized fuel is then injected into the combustion space. The fuel burns rapidly causing an explosion insidethe combustion space. The explosion causes a tremendousrise in pressure and the piston is pushed down towards BDC.As the piston moves down, the exhaust ports uncover about 50 degrees from BDC. Exhaust gases are thus led out from the cylinder. The pressure inside the cylinder drops immediately.The piston moves further down. At 35 degrees from BDC, ituncovers the air intake port. Fresh air is then led into thecylinder.The piston then reaches BDC. Because of the momentumcreated from the force of the explosion, the piston reversesin direction and moves upwards towards Top Dead Center (TDC).The process then repeats itself.In some designs, the exhaust gases are removed through anexhaust valve, located at the cylinder head and very similar to the 4-stroke engines. This type of scavenging is calleduniflow scavenging. The timing of the valve opening andclosing will be controlled by a camshaft, push rods, rocker arms or other similar devices.Well folks, why do we want to squeeze all the strokes into2 cycles? That could be discussed further..."PRODUCE YOUR BEST WITH THE BEST!"Hard-to-find tools become easy-to-find.http://www.free-marine.com/linkeastwood.htm Article Tags: Bottom Dead Center, Piston Moves Further, Piston Moves, Dead Center, Bottom Dead, Cylinder Liner, Degrees From, Exhaust Gases, Moves Further
Bigger,Power,with,Two,Strokes,