What Are Shock Absorbers? How Damping Works
Shock absorbers control how quickly a suspension moves after a bump, turn or braking input. Springs support the vehicle and store energy as they compress; dampers dissipate that energy so the suspension does not keep oscillating, helping tires follow the road.
Oil flow turns movement into damping
As a shock compresses and extends, its piston moves through hydraulic oil. Oil is forced through restricted passages and valves, creating resistance to motion and converting mechanical energy into heat. Compression damping controls inward travel; rebound damping controls extension as the spring releases energy. Valving determines how resistance changes with piston speed. A strut performs this damping function while also serving as a structural suspension component.
Why nitrogen and tube design matter
Gas-charged shocks still use oil for damping. Nitrogen helps manage internal pressure and reduce aeration, which can make damping inconsistent. Twin-tube designs use a working cylinder and surrounding reserve space, commonly with a lower-pressure gas charge. High-pressure monotubes separate oil and nitrogen with a floating piston and expose their single working tube directly to cooling airflow. Neither layout alone determines ride quality; valving and vehicle application remain essential.
Hydraulic-only and adjustable designs
Hydraulic-only dampers lack a nitrogen charge and are more vulnerable to aeration under demanding use. Adjustable dampers may use different internal layouts; their adjustment changes specified damping characteristics rather than automatically changing ride height. Follow the manufacturer's settings procedure. Turning an aging shock firmer is not a repair for worn seals, leakage or internal damage.
Coilovers add a spring and setup choices
A coilover combines a damper and coil spring. Designs with adjustable spring perches can alter ride height within their intended range, but require compatible springs, adequate travel and proper setup. Coilovers are not automatically race-only or automatically comfortable. Choose around the vehicle's suspension geometry, use and installation requirements.
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Related guides
Frequently asked questions
Does nitrogen replace the oil inside a gas shock?
No. Oil passing through valves creates damping; nitrogen helps control pressure and limit aeration.
Will adjustable shocks raise my vehicle?
Damping adjustment normally changes motion control. Ride-height adjustment requires a suspension design specifically equipped for it, such as an appropriate adjustable-perch assembly.
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