Shock Basics

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Shock Basics

What is the difference between a “Mono tube” gas charged shock and a “Twin Tube shock”?

Mono Tube Shock:

Most commonly known as a “gas shock” which is designed and operates with the shock oil under pressure. This pressure is housed in a separate chamber sometimes referred to as a “bulb”, or an “external revivor”. The gas chamber is divided from the oil of the shock often by a floating piston or a rubber bladder. The chamber i charged with nitrogen. The “charge pressure” is directly dependent on if that shock has an optional base valve and or what compression value the shock is tuned for. (See base valve and charge pressure explanation below) This is a single tube shock body and if dented or damaged it will not allow the internal components to work correctly, and often will cause further damage to the components inside.

Twin Tube Shock:

Com monly known as a “oil shock”. A Twin Tube shock also has a gas chamber which is commonly made from a proprietary plastic bag wrapped around a secondary tube inside of the shock. This secondary tube internal surface is the surface that the piston travels in. Twin tube shocks require a base vale to operate. The base valve creates a controlled transfer of fluid from the internal chamber to the area between the outer body and the inner tube. This area is the reservoir to the shock to store oil and the gas bag. A twin tube shock can continue to work properly with some dents or damage to the outside body.

What Is The Job Of The Shock?

In Circle Track The Shock Has 2 Main Jobs


If the spring and shock combination is too stiff, you risk skating across the track surface or bouncing on top of it. Either scenario reduces the effectiveness of the tire and its grip to the track surface.


The amount of understeer and oversteer (tightness and looseness) present in a chassis at various sections of the track can be controlled by the valving inside of your shocks. The springs hold the car up and at attitude. A shock is best used to control the timing of how the weight is being transferred to help maintain maximum grip and stability.

What Is “Cavitation”?

Vaporous cavitation is an ebullition process that takes place if the bubbles grow explosively in an unbounded manner as the air and moisture trapped in the shock oil turn to vapor. This situation occurs when the pressure level goes below the vapor pressure of the liquid.

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