there are all kinds of dyno's...
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there are all kinds of dyno's...
I would be willing to bet that most all coilover springs have changed height/rate/frequency after 10 races. I do not have access to a smasher, I am just applying common sense. Many spring manufacturers(american foundry conmpany incorporated) claim that there springs are guranteed to not loose over a certain amount of height over the springs life. I am almost sure that these companies make a living off of the fact that almost nobody bothers to check there springs rates as they age. SWIFT
Maybe Mastersbilt can explain it to me better. How much does it really matter if your smashing and resetting springs each night/week for track conditions or different track? So it now takes 1/8 of a turn more to get your numbers where you want them. Maybe if your running weekly at the same track and do not have to adjust anything then yes over time I could see where it might catch up to you.
all springs have a cycle life , I will use a valve spring for example , I have had valve springs hold there specs for a long time , then all of a sudden they will drop like 20lbs seat pressure , after that , they drop rapidly , your talking about thousands and thousands of cycles here , it would take a bunch of races for a coil suspension spring to do this , unless poor manufacturing is involved .....
What machine would test the rebound rate, Frank/Bubba is referring to?
You would need to fixture the spring to a plate and impact it with a dropped mass. Then you need a high speed camera to count the oscillations over time. Any type of contacting displacement transducer could affect the frequency and require a way to calculate the effect. If the resistance is low enough, compared to the springs' rate, it can be ignored.
How concerned should be be if the springs are losing their rebound rate? Sounds like average Joe couldnt test these springs and we're left to the manufacturers recommendations!
Does Bubba Gale have the same credibility issues?
I'm imagining a suspension spring in place of a valve spring with a proportionate size.
A valve spring being around 2" tall and around 1.55 in diameter, scaled up a percentage to fit between the axle and frame. Say 500 percent?
If you also scaled up the valve, lifter, keepers, retainers, ect... including what it asked to do, basically a gigantic valve spring and the supplied the same Cycles/time/heat I think you'd find the same thing happening.
A spring is a spring....Valve springs just live much harder lives but they will both eventually suffer the same fatigue.
some valve springs hold there pressure but will break when cycled out , others just loose pressure , and loose it quick when cycled out , guess you will never really know what happens to a spring in the suspension case .