# Are all coil springs the same size?

## Are all coil springs the same size?

Coil springs are rated by free length, compressed length, outside diameter, coil count, and wire size. Most import passenger vehicles use coil springs because of their size and versatility. Most are linear, but coil springs can be progressively wound so that as the load increases, the spring rate also increases.

**Can a coil spring be stretched?**

Yes, a coil spring can be stretched and then shortened increasing it’s rate and maintaining stock ride height, at least for a little while. In order to stretch the coil the steel would have to be stretch beyond it’s yield point.

**What is coil spring free height?**

Definition: The actual length of a compression spring without any sort of load or force being placed on it.

### How do you calculate the length of a spring?

To calculate spring wire length per coil, you must subtract the wire diameter from the outer diameter in order to get mean diameter. Once you have calculated mean diameter, multiply it by pi (3.14); this will give you the length of wire per coil.

**What is free length of spring?**

The free length of a spring is defined as the length of a compression spring without any force or load applied to it. Even if the load or force applied is small, the spring may deflect by at least a thousand of an inch. The deflection depends on the amount of force applied, and durability of the spring.

**How are springs sized?**

To measure a compression spring, you can use dial calipers, a micrometer, a ruler or tape measure for larger springs. Wire diameter is found by placing your calipers on the wire in the center of your spring. Total coil count is defined as each full rotation and the remainder of the last coil.

#### How do I identify coil springs?

Here are a few symptoms that will let you know if your coil springs have worn out.

- Sharp Vehicle Sagging.
- Unusual Tire Wear.
- Unsettling Noise.
- Harsh Vehicle Bounce.
- Abrupt Vehicle Sway.

**Does stretching a spring make it stronger?**

In the case of an extension or torsion spring, there are less coils working together to provide that extension or torque so, again, you spring will be stronger, but it will be under more stress.

**How do you calculate the length of a spring wire?**

## How do you measure free spring length?

To get the free length of a torsion spring, you multiply the length of the spring wire per coil by the total number of coils and add the lengths of the legs.