Spring rate refers to the amount of weight that is needed to compress a spring one inch. If the rate of the spring is linear, its rate is not affected by the load that is put on the spring. For example, say you have a 200 lb. per inch spring – it will compress 1” when a 200 lb. load is placed onto the spring.

Is higher spring rate better?

You might think the higher spring rate would react faster, but in reality, the lower spring rate will contact the ground first, and thus allows for more grip. … With a lower spring rate, the force pressing the tire down remains higher longer relative to the amount of travel it has, so it contacts the ground much sooner.

What is spring rate measured in?

Spring rate is a value measured in either pounds per inch (in the royal system) or newtons per millimeter (in the metric system). This value determines how much load you will be required to place on your spring in order to travel 1 inch of deflection.

How do you calculate spring rate?

To calculate the amount of spring rate you will need on order to meet your working loads, simply divide the load you will be applying on your spring by the distance you expect your spring to travel or compress under that load.

What is 8K spring rate?

When someone says “8K” they are shortening the metric measurement of the spring rate; in this case 8 kg/mm. What this means is that if you apply 8 kilograms of weight to the top of the spring it will compress 1mm. If you apply another 8 kilograms (16kg total) of weight it will compress another 1mm.

What is a low spring rate?

The lower spring rate range below 170# is the dead or inactive spring coils which do nothing but give the spring tension at full rebound. Note that this does not take into consideration the bump stop engagement and their effect on chassis ride height with the installed lowering springs.

Does spring rate affect ride height?

Because spring rates are the same each spring will collapse the same amount under the weight of the vehicle. The result is the same amount of ride height.

What is a high spring rate?

Spring Rate refers to the amount of weight it takes to compress a spring a certain distance. The higher the spring rate, the stiffer the spring. … Some springs are non-linear, which typically means the spring gets stiffer the more you compress it.

Is spring rate the same as stiffness?

Spring stiffness is based on spring rate . If you lower the amount of coils, you’ll increase the spring stiffness which is the spring’s rate. … If you adjust the outer diameter or the wire diameter, you will affect spring’s force and stiffness as well.

How do you read a spring rate?

Most commonly seen is a spring rate given in KG/mm or LBS/in. This means the weighted force / the space traveled. For example, 700LB/in would mean 700 pounds will compress that spring 1”. This can also be read as 12.5K/mm (12.5kg to compress spring 25mm).

Article first time published on

What is the meaning of spring pressure?

Simply put, valve spring pressure is how much pressure is on the valve at a specific measurement. Part of what goes into this is what the spring’s rate is per inch and the installed height. The valve spring pressure measurements you will see are what it has for seat pressure and open pressure.

What is spring rate in suspension?

In simple terms, a spring’s rate is the amount of weight required to compress itself a single inch. It’s a universal measurement, it applies to everything from lowering springs to valve springs, and it’ll look something like this: 500 lbs/in. The bigger the number, the stiffer the spring.

What is spring pitch?

Spring pitch is the distance between two adjacent coils, measured from the midpoint of the spring material. Spring rate is the ratio of force required to deform a spring to the extent of deformity.

What spring rate do I need coilovers?

With a typical street car, you’re looking for the weight of the vehicle to compress the springs 25- to 30-percent. For drag cars, you will typically want between 30- and 35-percent of the spring to compress.

How much do coilovers compress?

See all 9 photos Many high-end coilovers—like Eibach’s Multi-Pro R2, for example—don’t feature adjustable bases, which means preload has to be introduced or taken away when adjusting ride height. There’s a reason for that, too.

Is spring rate the same as spring constant?

Definition: Spring rate, also known as spring constant, is the constant amount of force or spring rate of force it takes an extension or compression spring to travel an inch of distance or, in the metric system of measurement, a millimeter of distance.

Do Springs get stiffer over time?

Yup. The springs will become harder over time due to the constant flexing.

Can you raise a car with coilovers?

With partially threaded coilovers like the one shown, to raise the car, you will turn the collars up the shock body and to lower you will turn the collars down the shock body. … You will then use the adjustment wrench to turn collar A clockwise to lower and counter-clockwise to raise the car.

How do I make my coilovers softer?

For a smooth ride, you need to soften both the compression and rebound on your coilovers. Fortunately, this should not be that difficult. Coilovers that provide these adjustability will also include a knob that you can just turn for adjustment. Note that not all coilovers come with adjustable compression and rebound.

What do stiffer springs do?

Stiffer springs make the car feel more responsive, more direct. They also help the car jump a little better and higher. Stiff springs are suited for high-traction tracks, which aren’t too bumpy. Softer springs are better for (mildly) bumpy tracks.

Do lowering springs help handling?

Because lowering means getting stiffer springs, there is less weight transfer when you hit the gas or brake hard. This means you’ll enjoy faster acceleration and quicker stops. Lowered vehicles are more aerodynamic. There’s less air hitting the wheels and tires (that are not streamlined shapes).

Which is better soft or stiff suspension?

A stiff suspension will make sure it’s pushed exactly where it needs to go. Your softer road suspension will keep your back happy so you’re not bouncing over every imperfection in the road. The proper setup for you might fall somewhere in between, and if you watch this video you’ll know why.

How do you make a spring stronger?

If you make the wire diameter larger, you will make the spring stronger and if you make it smaller, you will make it weaker. This is because, by making the wire diameter larger, you are also making the spring’s coils tighter which reduces the spring index.

Does shortening a spring make it stiffer?

The first thing you need to know is that cutting a coil spring will not only lower the vehicle, but it will also stiffen the spring making the ride and handling a bit firmer. But this is a good thing because lowering a vehicle reduces the amount of suspension travel.

What spring rate do I need dirt bike?

This will depend in part on your size and in part on your riding style and preferences. Right out of the box your spring rates are usually set for someone of average size — this typically means 75 to 80 kilos or 165 to 176 pounds. If you are lighter or heavier, that spring rate won’t perform as well for you.

Is stiff suspension good or bad?

A stiffer suspension reduces the reaction time and makes the driving much easier. Aside from that, less roll improves the aerodynamics. If you have an air dam that is almost scraping the road, when the car leans, it will be scraping the corners of the air dam.

How does spring rate affect ride quality?

The advantage of a progressive spring is that it can provide a variable ride quality-softer when the suspension is at a normal ride height, and stiffer as the spring is compressed, such as when the suspension is being pushed hard through a corner.

What is the stiffness of spring?

When a coupling experiences a load in a direction that places it in tension or compression, its spring stiffness comes into effect. This is usually described by using Hooke’s Law. This law relates the force and displacement of a spring using its spring constant. This value varies for different materials.

How much spring pressure do I need?

Engine TypeSeat PressureOpen PressureStock Small Block120 – 145 lbs.260 lbs. minimumModerate Performance Small Block300 – 360 lbs.High Performance Small BlockUp to 425 lbs.Stock Big Block130 – 165 lbs.280 lbs. minimum

What can happen if value spring tension is too low?

Low Valve spring tension will cause valve float and reduce rpm, miss firing , popping in intake manifold or exhaust. If valve spring tensions are very low or broken valve stem Retainer keys can Disengage valve stem grove and drop out of guide damaging or Destroying engine.

What is spring index and spring rate?

The spring index is the relationship between the mean diameter and wire diameter. The equation is shown below. This is a very important relationship to consider for manufacturing ease and cost control. As a general rule, the index should be above 3 and less than 20.