![]() The damping force is going to further increase because the oil's true dynamic viscosity (kinematic * density) is also higher generating higher viscous losses through the flow circuitsīut the values of kinematic viscosity printed on the side of the bottle are going to be identical!īecause of the kinematic viscosity definition, cSt values of oil viscosity is a really poor way to spec a suspension fluid. The damping force from the high density oil is going to be higher because the oil weighs more So if you compare two oils with identical values of kinematic viscosity but one oil has a higher density the actual damping force produced by a shock is going to be different for two reasons: Oil density changes become even more hideous when you understand the definition of kinematic viscosity used to report cSt values of oil viscosity. Differences in oil density translate directly into damping force differences. Obviously it takes a higher pressure drop to push a heavier, higher density, fluid through a flow restriction. Something that does not get talked about much is the density of suspension oils from manufacture to manufacture vary quite a bit. Centistoke (cSt) is not a measure of true viscosity:
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