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Cylinder Valves
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[QUOTE="terry hay, post: 695375, member: 48273"] Drehwurm As with the garden hose analogy, the smaller the port the greater the velocity of the discharge. The port diameter certainly affects damping,in fact this damping is known as velocity squared damping. Double the velocity, four times the damping. Triple the velocity, nine times the damping. So the influence of the port diameter at high speeds can be dramatic. Particularly when you consider that oil is a non-compressable fluid. I guess you would have to determine terminal velocity of the port before you you could truly measure total shim deflection. All the while, prior to terminal velocity, the discharge velocity is always increasing relative to pressure. If you were to pinch the hose further away from the nozzle, the same hydraulic principal applies. Only now you are adding an extra stage. Large piston to small piston to large piston. With a fork cartidge we deal with the parameters we are given and the shimstack becomes our tuning variable in the majority of cases. If you choose to you may vary those parameters by opting for different pistons with different flow rates. [/QUOTE]
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MX, SX & Off-Road Discussions
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