The automotive world never stands still—coil springs once dominated, but innovations like air springs have redefined suspension performance and remain just as relevant today as when they first appeared. Air springs are a crucial component in modern suspension systems that blend comfort, performance, and adaptability like no other. Understanding the mechanics behind this technology can give you a better appreciation of what’s happening beneath the chassis. So let’s take a deeper dive into the engineering and functionality of air springs, why they matter, and what sets quality components apart from the rest.
HOW AN AIR SPRING WORKS
An air spring consists of a compartment filled with pressurized air and a rolling piston connected to the vehicle’s axle or integrated into the suspension strut. A rubber sleeve is securely fastened between these two components using high-grade steel crimping rings, ensuring a durable and airtight construction. This area forms the “active area” for the pressurized air.
An Electronic Control Unit (ECU) continuously monitors inputs such as height sensors, vehicle speed, and acceleration sensors to determine whether the air spring should inflate or deflate. This process maintains the vehicle at its predetermined ride height.
HIGH-QUALITY ARNOTT AIR SPRINGS
Although an air spring is a wear-and-tear component, it’s designed to withstand a wide range of environmental conditions, including extreme temperatures and the constant abrasion from road debris.
Arnott uses elastomer from reputable OEM suppliers like Continental ContiTech and Goodyear. The sleeve is constructed with a premium 5-layer multi-ply design to ensure long-lasting performance and structural integrity:
- Outer elastomeric layer
- Cord layer
- Intermediate elastomeric layer
- Cord layer
- Inner elastomeric
AIR SPRING CHARACTERISTICS
Conventional coil springs have a linear spring rate, meaning the same compression force is needed to compress them during the complete stroke. These coil springs can be tuned to progressive behavior by changing the distance between the turns and/or varying the thickness of the steel.
Air springs exhibit a progressive spring rate. The force required to compress an air spring increases exponentially through the stroke, meaning more force is needed to compress the air spring near the end of the stroke. This results in an overall more comfortable driving experience. The spring behavior can be adapted to a more comfortable or sportier ride by changing the angle of the rolling piston. This is one of the reasons that a passenger car’s sport (air) suspension system usually features a different air spring than the standard (air) suspension for the same model.
WHY AIR SPRINGS OUTPERFORM COIL SPRINGS
Air spring systems offer self-leveling capabilities, automatically adjusting to maintain consistent ride height, even when the vehicle is loaded with cargo. Coil springs, in contrast, do not compensate for additional weight and are more likely to bottom out on uneven surfaces or rough terrain.
Reducing the air inside the air spring lowers the ride height at high speeds. This brings the vehicle closer to the ground, decreasing the drag coefficient and thus reducing fuel consumption.
At higher speeds, the system can reduce the air pressure to lower the vehicle’s ride height. This reduces aerodynamic drag, contributing to better fuel efficiency. Another key advantage is comfort. Air springs naturally absorb road harshness, delivering a smoother, quieter ride. Most drivers cite this as the top benefit of having a vehicle with factory-equipped or high-quality aftermarket air suspension.
ENGINEERED TO RIDE, BUILT TO LAST
During development, Arnott carefully examines the original air spring design and construction to identify any weaknesses or potential improvements. If flaws are found, the design is modified and optimized for performance and durability.
Arnott often incorporates improvements that allow for easier installation or fail-safe handling. Once development is complete, each air spring undergoes rigorous testing: over 3,000 miles of road simulation, durability cycles, and burst pressure testing, ensuring that it meets or exceeds OEM standards.
While some aftermarket air springs may look similar on the outside, the differences can be significant. Using lower-grade materials, simplified piston designs, or subpar rubber can result in lower burst strength, poor fitment, compromised comfort, and increased NVH (Noise, Vibration, and Harshness).
As vehicles become smarter and more advanced, air suspension systems are playing a bigger role in modern workshops. Well-designed air springs are key to maintaining proper ride height, comfort, and handling. Whether you’re servicing a premium SUV, a van with heavy loads, or a performance car, selecting high-quality air springs like Arnott’s ensures reliability, driving comfort, and satisfied customers.
