High Quality Content by WIKIPEDIA articles! The motion of a non-offset piston connected to a crank through a connecting rod (as would be found in internal combustion engines), can be expressed through several mathematical equations. This article shows how these motion equations are derived, and shows an example graph.The velocity maxima and minima do not occur at crank angles (A) of plus or minus 90°. The velocity maxima and minima occur at crank angles that depend on rod length (l) and half stroke (r), and correspond to the crank angles where the acceleration is zero (crossing the horizontal axis).

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