Secondary Engine Balance - Explained

What are secondary engine forces? How do you balance secondary forces? This video explains secondary forces, which are forces that occur twice per revolution of the crankshaft. Secondary imbalance is a result of the speed variation of the piston as it reaches the top of the cylinder versus the bottom of the cylinder. The piston moves slightly faster at the top, and slightly slower at the bottom, causing a difference in intertia resulting in an engine imbalance. Some engine layouts, such as an inline six, or flat engine, balance out secondary forces.

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