Hybrid_From_Hell Posted October 12, 2009 Share Posted October 12, 2009 Hmmmm Today I had the wheels off the 90 for a new set of pads, and whilst I was under there I decided to fit the new springs I had, these were to replace what was one there, as the drivers rear had developed a list to that corner, and I guessed the springs had gone that corner, and the other was prob on its way. They were 2nd hand but not too much used when I gotr them, and now they are not made any more, so hence the R&W Threads (which it seems to be fine with), BUT, and this has puzzled me, these springs are exaftly the same (ie not handed) yet when I took the old ones off (one knacked) I fully expected the free length to be less on the kanckered one - BUT - they are EXACTLY the same Is this possible ?, curious really, I expected the knacked one to be shorter, or can it be the free length says the same but some of the internal bouce gasses have escaped form inside the spring ? Any spring gurus out there ? Nige Quote Link to comment Share on other sites More sharing options...
BogMonster Posted October 12, 2009 Share Posted October 12, 2009 Definitely the internal bounce gases Quote Link to comment Share on other sites More sharing options...
rusty_wingnut Posted October 12, 2009 Share Posted October 12, 2009 Crack propagation in action? Quote Link to comment Share on other sites More sharing options...
Godlykepower Posted October 12, 2009 Share Posted October 12, 2009 After a day of business meetings with company Directors, where words like "Synergy" and "Paradigm" and "Harmonisation" get used often.......the best words I have heard all day are "Internal Bounce Gasses" Love it! Quote Link to comment Share on other sites More sharing options...
Ex Member Posted October 12, 2009 Share Posted October 12, 2009 No. It is not possible. The spring rates cannot change. They are fixed. You listing is due to something else. Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted October 12, 2009 Author Share Posted October 12, 2009 Erm Yes Me, being a plank, place both on a flat "Proper" flat surface and boy is there Seems the internal springs gases have escaped, and its got a small leak Nige Quote Link to comment Share on other sites More sharing options...
santalars Posted October 12, 2009 Share Posted October 12, 2009 Common problem. Mostly happens to people who drive more uphill left corners than downhill right ones. The rear drivers side wears out more quickly then. Quote Link to comment Share on other sites More sharing options...
bishbosh Posted October 12, 2009 Share Posted October 12, 2009 the drivers rear had developed a list You got some cream for that Nige??? :lol: :lol: Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted October 12, 2009 Author Share Posted October 12, 2009 Santalars - thats a very good point, I hadn't considered that - and you may be on to something Sir BishBosh, you sir are just being silly useful replys like the ones above should shame you in to posting such nonsense Nige Quote Link to comment Share on other sites More sharing options...
Milemarker Type S Posted October 12, 2009 Share Posted October 12, 2009 The spring rates cannot change. They are fixed. Err... surely they can- steel has elastic limits and fatigue limits. Springs will sag over time (some faster than others)- likewise the properties of the steel in a 'set' of springs may not be identical to start with. I see no reason why two used springs could not have the same free length yet be very different lengths with the same load applied- why not try one of your little experiments Nige- preferably without burning/cutting/ painting yourself (or come to think of it the cat!)!!! Quote Link to comment Share on other sites More sharing options...
Ex Member Posted October 12, 2009 Share Posted October 12, 2009 Err... surely they can- steel has elastic limits and fatigue limits. Springs will sag over time (some faster than others)- likewise the properties of the steel in a 'set' of springs may not be identical to start with. I see no reason why two used springs could not have the same free length yet be very different lengths with the same load applied- why not try one of your little experiments Nige- preferably without burning/cutting/ painting yourself (or come to think of it the cat!)!!! Yes, they can sag. The spring rate, however, cannot change over time. It is impossible. Quote Link to comment Share on other sites More sharing options...
Turbocharger Posted October 12, 2009 Share Posted October 12, 2009 If corrosion took even a very small amount off the diameter of the wire that makes up the spring, the rate would change. IIRC the rate is proportional to the fourth power of the wire radius(?) Quote Link to comment Share on other sites More sharing options...
landroversforever Posted October 13, 2009 Share Posted October 13, 2009 the spring rate is to do with amount of weight it takes to compress the spring one inch, is it not? so surely if the spring is sagging, then the rate has changed? Or am I barking up the wrong tree? Quote Link to comment Share on other sites More sharing options...
Ex Member Posted October 13, 2009 Share Posted October 13, 2009 the spring rate is to do with amount of weight it takes to compress the spring one inch, is it not? so surely if the spring is sagging, then the rate has changed? Or am I barking up the wrong tree? No, it just means it has been permenently deformed. the rate will stay the same. It is a function of the geometry (except free length)and the materials. Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted October 13, 2009 Author Share Posted October 13, 2009 Just to add for anyone interested, mine measured the same, yet later when I shoved them on a decently true surface (my workbench) one spring (the one that was lower on the 90) was obvioyus it had "Banananed" and was curved thus dependant on where you measured it etc you got an OK reading, when placed on a level surface next to each other the difference was obvious <doh> Nige Quote Link to comment Share on other sites More sharing options...
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