1. The piston stroke noun
of the piston stroke, also called piston stroke, refers to the piston moves from the bottom dead center to top dead center distances, it can be understood as a piston hyperactivity in the cylinder maximum distance. Stroke has a great impact on engine performance.
Effect of different strokes on engine performance
First, a key factor is the stroke of the engine speed. Under certain circumstances the displacement, engine design, there are two, one is a large stroke of the smaller bore a small stroke of the larger bore, the advantages and disadvantages of these two engines as follows:
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Why these two design approach has a different effect? first of all, it means that small stroke engine piston reciprocating motion can do more in the unit time, that is more likely to achieve higher Rotating speed. And a large stroke of the piston means a longer acceleration distance, which can output high torque at low speed. Small stroke length of the engine determines the smaller link, such link quality is much lighter, much smaller inertia, easier to achieve high speed and long stroke contrast. Since the length of the small connecting rod and the cylinder-stroke engine is reduced, also the lower center of the engine, while the opposite long stroke.
In order to compare the impact of stroke engine output, we selected several of the same displacement engine, do a little comparison:
From the graph we can see that under the same engine displacement, the larger the stroke of the engine, the lower the speed at the maximum torque output, otherwise higher. This figure clearly demonstrate the above theory.