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  • The shims start to open at 2ips when the rebound clicker is at 10 out.  We refer to the flow area through the rebound circuit as the rebound bleed area.  This rebound bleed area has the most influence on the compression numbers up to about 5ips.  At 5ips, the bleed area is close to maxing out.  That is to say, the flow rate through the bleed area is close to it's maximum, and any further pressure drop (from increase in velocity) will not increase the flow.
  • At 10ips the bleed area is maxed out, and the emphasis for increases to the compression forces shift to the shim stack.
    • This is an good place to see how your piston preload and/or initial stack stiffness is going to control the low speed (ls) damping. 
      • We will consider 5 - 10ips to be the low speed damping velocities.  We highlight 5ips, and refer to this as low speed (ls), but we will often look at both 5 and 10ips.
  • Quick note on terminology:  We call 2 ips the opening speed (os) , 5 - 10 ips the low speed (ls) and 50 ips the mid speed (ms) .  These are generic terms and are simply used to give us a basis for comparison.
  [1024] [1024]    
  Stack 2 Stack 2    
ips
ar lbs co  
ar % co  
   
1
  25  
  25  
   
2os
  42  
  42  
   
3
  61  
  61  
   
4
  80  
  80  
   
5ls
  97  
  97  
   
10
+78 175  
x 1.8 175  
   
20
  307  
  307  
   
30
  425  
  425  
   
40
  530  
  530  
   
50ms
  627  
  627  
   
60
  718  
  718  
   
70
  803  
  803  
   
  • Acceleration rate.
  • As the velocities increase, the compression force numbers increase. 
  • We look at the rate that the damping force increases from speed to speed.  We call this the acceleration rate, or ar for short.
    • We look at pounds force as well as the percentage of change.
  • From 10 - 70 ips the compression force numbers increase with velocities. 
    • Notice at 20 - 70ips the change in force drops off as velocities increase.
  [1024] [1024]    
  stk stk    
  Stack 2 Stack 2    
ips
ar lbs co  
ar % co  
   
1
  25  
  25  
   
2
  42  
  42  
   
3
  61  
  61  
   
4
  80  
  80  
   
5
  97  
  97  
   
10
175  
175  
   
20
+132 307  
x 1.8 307  
   
30
+118 425  
x 1.4 425  
   
40
+105 530  
x 1.2 530  
   
50
+97 627  
x 1.2 627  
   
60
+91 718  
x 1.1 718  
   
70
+85 803  
x 1.1 803  
   
   
 
 
 
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  valving info
valving 001
valving 002
valving 003
valving 004
valving 005
 
  complex stacks
complex shim stacks
 
  more valving info
valving 101
valving 102
valving 103
valving 104
valving 105
valving 106
valving 107
valving 108
valving 109