Dmitry Liskin - Extreme and defensive driving

Longitudinal rocking is an undesirable effect, since

• behavior of machine becomes less predictable;

• the best grip on the road is achieved, if load between the axles distributed evenly; longitudinal displacement of the center of mass redistribute load of axles, the total tyre grip on the road is reduced;

• efficiency of acceleration and braking is reduced.

Longitudinal rocking can occur at small oscillation amplitudes and be invisible to a racer. When drive axle hits a hole, suspension contracts, and motor speed increases. When leaving a hole, suspension is released, motor speed decreases. To change engine speed, it is needful to make an effort. The engine connected to transmission is able to partially absorb longitudinal rocking. Suppression of longitudinal rocking – is one of the reasons not to disconnect the engine from transmission while driving.

Undesirable longitudinal vibrations on road roughness can be caused by incorrectly selected spring rates and resistances to bump and rebound of shock absorbers. Often longitudinal rocking occurs on a car with weak shock absorbers and very strong springs: such a suspension does not “swallow” roughness, but pushes away from them, while vibrations of the body increase.

Bump resistance of suspension is created by springs and shock absorbers. If a compressive force is applied to a suspension, a suspension movement, by which it is compressed, depends on springs. Shock absorbers are necessary to dampen compression-stretching vibrations of springs and create additional resistance to the movement. How quickly bump or rebound occurs, mainly depends on shock absorbers.

When suspension springs are compressed, shock absorber rod moves inside shock absorber body, the shock absorber creates bump resistance. When shock absorber rod is pulled out of the body, the shock absorber creates resistance to so-called rebound.

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