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Spring question ?
- Thread starter bccap
- Start date
mike_of_bbg
Guest
1. Tight ends down
2. Loose ends down
3. Doesn't matter, as long as you're consistent between the two
I'd suggest that 3 is probably right, but I installed mine tight winds down at the suggestion they make less noise that way. How does the spring appear on the fiche?
CruisinFj60
Guest
koolaid_kid
Guest
the rule to remember is that the (tighter) progressive windings are placed at the stationary end. There is always movement anywhere there is spring. the wide windings go where the movement is initiated.
so for convential forks the tight windings are up top. for valve springs they are against the head.
Steve
GS Whisperer
Agemax
Forum Guru
A Progressive spring is not the same as a Dual-Rate Spring. A progressive-wound spring is similar to a dual-rate in that it has an initial and final rate. The drawback of a progressive spring is that the crossover point is not adjustable. How the spring is wound determines the characteristics of the spring. This type of spring is wound with a varying pitch, as opposed to a constant pitch used in linear rate springs. One end has greater distance between the coils than at the other end of the spring. As the coils compress the coils closest to each other touch, (become coil-bound), which effectively reduces the number of active coils. As the number of active coils reduce the spring rate rises or becomes stiffer. Depending on shaft travel of a particular shock, an inappropriate progressive spring can actually cross over the initial rate in pre-load, or not attain the final rate at all. Progressive-wound springs can be a compromise if they are not designed for the specific application
http://www.progressivesuspension.com/?gclid=CKe7-5j1taoCFQgbQgodp1-D6g
Steve
GS Whisperer
Just remember that 20w oil does not hold up the bike or keep the suspension from bottoming.
It only slows down the response to keep it from bottoming as quickly.
I read some tech articles on suspension from a race mechanic, and he suggested using the lightest weight oil that would do the job of damping. Yeah, different bikes, different spring rates, different riders, different tracks all required their own settings for oil level and viscosity, but his theory was to use proper springs to hold the bike up and light oil to keep them damped.
.
7981GS
Guest
Daniel
Really? :-k
I thought that the tight ones compressed first.
.
Actually, all the coils compress together, but the tighter end coil binds first, reducing the effective length of the spring and making it stiffer.
The spring has no idea which end it's being compressed from, the only advantage to putting the tighter coils up top is that reduces unsprung weight by a tiny amount. Completely insignificant effect in a motorcycle fork.
Put them in with the tight end up, down, mixed, whatever, you'll never feel a difference.
Agemax
Forum Guru
how does it do that then? considering the springs are part of the mechanics that all the unsprung weight is attatched to!
how does it do that then? considering the springs are part of the mechanics that all the unsprung weight is attatched to!
The top of the spring is 100% sprung weight, the bottom of it is 100% unsprung. A linear spring has its weight evenly distributed over its length, so 50% of the weight is unsprung. A progressively wound spring has a heavy end though, the one with the tighter coil winding. So if you install it with that end down you might end up with 60% of the total weight being unsprung.
A pair of springs weighs around 35ozs, so 10% of that is 3.5ozs. Compared to the weight of the wheel, tire, brake disks, calipers, fork sliders etc. that's insignificant, less than 1%. Ergo, it doesn't matter which end goes up.
