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Re: ? about comparing ride height of linear springs
Posted by BillR [Email] (more from BillR) on Mon, 27 May 2002 16:03:42
In Reply to: Re: ? about comparing ride height of linear springs, Ubipa, Mon, 27 May 2002 11:17:17
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I see what you are trying to do but I think you are mixing your calculations. That is, spring rate is based upon coil diameter, wire diameter, no. of active coils, and the constant (of course, assuming linear rate steel springs). With the calculation, which I don't have handy, you can get your percentage of spring rate difference between two coils but it won't do anything for you on ride height. I'm still trying to figure that one out myself (have never seen a calculation for that though)but you should be able to get an idea if you know what the weight is at each corner of the car.
In regard to active vs. inactive coils, obviously any coil that is stacked with weight on the car is inactive. So those would be any that are in contact with the seats and any that are touching adjacent coils. On stock springs, I would think that this is in the 1.5 to 2 coil range dependent upon the configuration of the seat and whether the last coil is "flattened" a bit to sit on the seat. I usually figure that the first full coil on each end of the spring is inactive and count all the others as active. Interestingly, you will get a bigger difference on rate by changing the wire diameter and I have found that a coil difference usually gives you a difference of about 20% given the normal wire diameter of .5 inch plus or minus a few tenths.
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