The difference between the two spring height figures is 2.44 inches, which yields a product of 1,220 when multiplied by the spring rate of 500 lb/in. This spring needs to reach a solid height of 3 inches, therefore having to travel 2 inches. Well – going back to your rate of pay, if you make $10 per hour and only work for 15 minutes, don’t you want to make $2.50? To calculate the working load of how much force you’ll need in order to reach a solid height of 3 inches, you’ll have to multiply the distance traveled by the spring rate as shown in the following formula and diagram. 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.The units of measurement of rate in the English System are, lbf/in (pounds of force per inch) or N/mm (newtons per millimeter) in the Metric System. Linear vs. ProgressiveA linear spring has the same spring rate throughout its compression range. I’m Low Spring Rates. Progressive-rate springs have a variable spring rate that increases as the spring is compressed. The constant of a whole spring is force per unit length of extension the rate constant will be F/L/L so force.

“Linear rate springs” have one defined spring rate per inch of deflection throughout most of their range of deflection. But what these rates don’t tell you is that the chassis is already sitting at the 170# rate at loaded height. Spring rate, also known as spring constant, is the constant amount of force it takes a compression or extension spring to travel a proportionate amount of distance. Spring Load This example shows you how spring load works and how it is derived from spring rate. High Rear Spring Rates: If the spring rate at the rear of the car is too high, the car tends to have oversteer handling characteristics, especially on throttle applications at corner exits. To figure out the Spring Rate you start by compressing the spring about 20% of the available distance of the spring and measure the height (Load Length 1) and the Load 1 in (lbs/inch) or (N/mm). As illustrated in the image above, when a spring is deflected beyond a certain point, some of the coils begin to touch each other and then the spring rate rises just as your rate of pay rises after 40 hours. The higher the spring rate, the stiffer the spring. The tyre will be more prone to wheel spin also, which reduces grip levels and increases wear rates. Well the same is true of springs. This means the “working spring rate” is actually 170# to 225#. This spring needs to reach a solid height of 3 inches, therefore having to travel 2 inches. If we find the calculated Spring Rate with a 2.0Hz front and 1.8Hz rear Suspension Frequency yields spring rates that we feel are a bit too high or low, we’ll adjust SF to coincide with our years of experience choosing and testing spring rates on a wide range of track cars and race cars. If the spring rate is 10 pounds per inch and the spring is only half an inch long, maybe it can only be deflected a quarter of an inch. Rock shocks used to label their high speed rebound as end stroke rebound, but even that was a misnomer because shaft speed is ultimately dictated by the amount of low speed rebound. Changing the rate of your valve springs can be used to fine tune performance based on your expected rpm range. 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.