Static imbalance can be determined by lifting the car and letting the wheel spin freely: the wheel's center of gravity will always be at the bottom. A wheel that has only static imbalance will bounce when moving.
"Dynamic" imbalance only appears when the wheel is rotating quickly. In this case, the heavier spot is not located on the central plane of the wheel, but is slightly shifted outward or inward. The wheel not only bounces, but also swings from side to side.
Wheel balancing
The wheels must be corrected for static and dynamic imbalance. There are two ways:
- The wheel is removed from the car and screwed to the balancing stand. There it is spun and at the same time it is measured where and what weight of lead weight should be installed on the wheel to compensate for the imbalance.
- To eliminate the remaining imbalance, it is necessary to perform precise balancing. In this case, the imbalance of the wheel hub and brake disc is also compensated. Without removing the wheels from the car, they are spun using an electric motor with a friction disc to the required speed, while the residual imbalance is recorded. It is also equalized using lead weights.
Note: Recommendation: the front wheels do not need to be spun for precise balancing with the electric motor. One-sided acceleration is harmful to the differential mechanism. For precise balancing, lift the front of the Renault 19 and use the engine to spin the front wheels in fourth gear to a speed of 90 km/h.