02GF74 Posted September 28, 2006 Share Posted September 28, 2006 I have a coil, 7.5 turns, 291 mm (11 1/2 in) long, wire dia. 10 mm, and I.D 70 mm (2 3/4 in). It has stamped JW on it. It was fitted to that most respected of British supercars: the Triumph Dolomite Now I am guessing Rover/Triumph/BL/Whoever would not be making their own coil springs but buy them from a spring manufacturer so in theory there is a whole plethora of springs in this size (coil diameter). The JW is either the manufacturer or more likely a code for the spring rate. Does anyone know of a website - spring makers etc. that can give the spring rate for this spring, ideally using the 2 letter code? Or a website with spring data that I can use to extrapolate the rate? Alternatively, is there a formula that calculates spring rates - I think I have all the data except for the material; but let's assume it is regular springy steel stuff. Ta. Quote Link to comment Share on other sites More sharing options...
David_LLAMA4x4 Posted September 28, 2006 Share Posted September 28, 2006 Try 'Springcoil' of Sheffield....... can't find their number right now but Karl Grimm is the bloke you need to speak to...... David LLAMA 4x4 New Online Store Quote Link to comment Share on other sites More sharing options...
MogLite Posted September 28, 2006 Share Posted September 28, 2006 Assuming its not progressive Measure the height of the spring Add a known weight Measure again Do basic maths For the known weight, you might find yourself and the bathroom scales appropriate. If you can find a fat burd to help you out - your results will be more accurate, and you might have some fun Quote Link to comment Share on other sites More sharing options...
02GF74 Posted September 28, 2006 Author Share Posted September 28, 2006 yeah, I'ver done the standing on them - not as easy as you may think as it is very instable (used a full herry can each side to support it). anyways, I get between 125 and 150 lbs/in; I would like to know what they are meant to be though. another way was to put it on top of scales on a drill press and measure that way. -------------------------------- now to give a bit more of the picture. The second test was to measure the other spring fitted to car in free air and "when on the ground" (i.e. jack up under axle until chassis is hust off the stand). Free length = 291 Fitted length = 250 (I have thought how can measure this better) Compress by = 41 Change in length when loaded 15 mm Total change in length = 56 mm using 150 lb/ins, supported weight = 150 kg using 125 lb/ins, = 125 kg From SVA, rear axle = 282 kg. Or 141 kg per side. Now english axle, brakes, shafts etc is gonna be about 50 kg, wheel + tyre is 15 kg (my estimates) or about 40 kg per side. So adding the unsprung mass, then I get 190 or 165 (cf measured 141). close but still a few kgs out. The point of all this is to see what is needed to get the rear end lower. There is a rubber buffer between bulkhead and top of spring shroud with 2 shaped washers that I reckon removing will give me about 25 mm - it is bad idea to do that as the top of the spring will move against the bulkhead but I could fit a thinner rubber buffer? (or I could cut the top of the mount and use a plate held by bolts that can be raised/lowered to adjust ride height) Basically I think the set up in shock/spring is good enough so no need for new springs or shocks. Comments? Quote Link to comment Share on other sites More sharing options...
LR90 Posted September 28, 2006 Share Posted September 28, 2006 I'd do a quick search or pm Red90. Pretty sure with the info on number of coils, wire diameter and spring diameter there will be a stock calc to give you the spring rate. Quote Link to comment Share on other sites More sharing options...
Bush65 Posted September 30, 2006 Share Posted September 30, 2006 I have a coil, 7.5 turns, 291 mm (11 1/2 in) long, wire dia. 10 mm, and I.D 70 mm (2 3/4 in).It has stamped JW on it... John Wile (not sure if spelling is correct) were spring manufacturers. Quote Link to comment Share on other sites More sharing options...
02GF74 Posted September 30, 2006 Author Share Posted September 30, 2006 managed to get a spring calculator - if t here is demand, I'll post it on monday. do JW is manufacturere hmmm. Quote Link to comment Share on other sites More sharing options...
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