fewer cylinders), the pulsations in power delivery vibrate the engine rotationally on the X axis, similar to a reciprocating imbalance.

Rotating imbalance

A rotating imbalance is caused by uneven mass distributions on rotating assemblies

Types of rotating phase imbalance are:
* Unbalanced eccentric masses on a rotating component, such as an unbalanced flywheel

Types of rotating plane imbalance are:
* Unbalanced masses along the axis of rotation of a rotating assembly causing a rocking couple, such