How long do stock springs last?
02-10-2007, 11:20 AM
#3
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A loooooong time. Expecially mine, which have been in a box for many years. Not sure why I keep them....maybe a return to the Paris-Dakar Rally?
02-10-2007, 11:59 AM
#4
RL Technical Advisor
Originally Posted by 95 C4 993
Just wondering
As far as I'm concerned, indefinitely.
I've never seen a set break or sag, unlike some of the aftermarket stuff.
02-10-2007, 12:17 PM
#5
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Originally Posted by Steve Weiner-Rennsport Systems
Hi Carter:
As far as I'm concerned, indefinitely.
I've never seen a set break or sag, unlike some of the aftermarket stuff.
As far as I'm concerned, indefinitely.
I've never seen a set break or sag, unlike some of the aftermarket stuff.
Yes, another one of my over thinking about upgrading something in my vehicle.
I think Im either:
HD's and Row M033's-have nasty speed bumps and steep entries in a lot of places around SLC. I think that would give me the comfort a good set up.
HD's and Row M030-2nd choice
PSS9's----could scratch 1 and 2 and go this route.
Paper, sicissors , rock!!
02-10-2007, 12:26 PM
#6
Nordschleife Master
I do think the springs have a wear life. I'm in the process of working with some of my 964 Cup Car guys and this winter have tested the springs and they aren't the same left to right and they don't match the factory rating any longer, they aren't even close. The spring length is different too indicating that they have sagged. Take it for what its worth, this has been my experience with these particular cars.
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02-10-2007, 04:48 PM
#9
Rennlist Member
A spring will last indefinitely as long as the magnitude and frequency of its compression/extension cycles stay within the elastic limits of the particular steel alloy: street cars rarely exceed these limits.
Geoffreys comment is entirely accurate, although it may be more reflective of the extreme duty cycles of competition cars. In the case where rapid cycling ( = higher internal thermal loading) and greater compression apply, there can be progressive changes to the metallurgy .... which results in ' spring droop'
Some of the aftermarket progressive springs ( vs. 'linear') are designed to have several coils in close contact at static load - and use a constant diameter wire in making the coils: this only leaves a few of the coils to do the majority of the load carrying in normal compression - and the coils in 'bind' are likely only in play after an extension. A spring of that type may well fatigue more rapidly.
The ROW MO30 springs are a very well made progressive, utilizing both variable coil spacing along with a progressive reduction of the coil wire diameter - this helps to keep the entire length of wire in play at all times, and look like they will last a very long time ...
Geoffreys comment is entirely accurate, although it may be more reflective of the extreme duty cycles of competition cars. In the case where rapid cycling ( = higher internal thermal loading) and greater compression apply, there can be progressive changes to the metallurgy .... which results in ' spring droop'
Some of the aftermarket progressive springs ( vs. 'linear') are designed to have several coils in close contact at static load - and use a constant diameter wire in making the coils: this only leaves a few of the coils to do the majority of the load carrying in normal compression - and the coils in 'bind' are likely only in play after an extension. A spring of that type may well fatigue more rapidly.
The ROW MO30 springs are a very well made progressive, utilizing both variable coil spacing along with a progressive reduction of the coil wire diameter - this helps to keep the entire length of wire in play at all times, and look like they will last a very long time ...
