How Engine Balancing Works - Smooth Running Cars

What is a balanced engine? Why do you want a balanced engine? An engine has uneven forces from rotational mass, reciprocating mass, and firing intervals. To balance the engine, we need to balance out these forces. Primary forces occur once per crank revolution, and are caused by reciprocating pistons. Secondary forces occur twice per crank revolution, and relate to the uneven speed of the piston as it moves throughout the cylinder.

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