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  • This is how how a crank dyno works.  [Scroll down for video]
     
  • Video showing a dyno run from 5 thru 50 ips (inch per second).
  • Scroll down for additional video links.
 
 
  • Here are are two additional videos.
  • This first video shows the dyno performing the seal drag and gas test.

  • The seal drag is first.  This measures the amount of drag from the shaft seal and piston band. 
    • The shaft moves from 6 o'clock (BDC) up to 9 o'clock for the seal drag test.  At 9 o'clock the stroke becomes very slow and seal drag test is performed.
    • Then the shaft moves to 3 o'clock and repeats the process. 
      • The program calculates the 'seal drag' from these two readings.
  • Immediately after the seal drag test, the dyno performs a gas test.
    • The shaft moves into the 9 o'clock position, comes to a stop, pauses and then takes a reading on the load cell.
    • Then the shaft moves to 3 o'clock and repeats the process.  The program calculates the 'gas force' from these two readings.
      • The gas force is the force exerted on the shaft from the nitrogen charge.
    • After the gas test, the dyno performs 5 ips run.
  • FIRST VIDEO --->   [shock dyno test, seal drag and gas test]
 
  • This second video shows the dyno performing our standard dyno run that produces the compression and rebound force numbers.  We dyno test all shocks at the following velocities.
    • - - dyno test velocities = inch per second (ips) - -
    • 1 ips
    • 2 ips
    • 3 etc
    • 4
    • 5
    • 10
    • 20
    • 30
    • 40
    • 50
  • The dyno runs these 10 tests consecutively (one right after the other). 
    • The first test is 1 ips.  The second test is 2 ips. 
    • You can hear the difference in the motor as the speeds increase.
  • SECOND VIDEO --->  [shock dyno test, 1 thru 50 ips]