Quote:
Originally Posted by Arn0
Sosidge, the value on the chart are approximation as the italic figures are, let say, guessed value so all values will change slightly but you got the rough idea, the range of value. That is the reason of the draft version.
I did some math and the theorical "leak" between piston and body is around or smaller that one smallest hole. So one third or less of the oil by-pass the piston oil, bigger the hole, smallest the rate.
I forget to mention the model is valid for laminar flow and so give the damping coefficient at "low" pistion motion, you need to use Reynolds number here so the suspension geometry to sort ot the Reynolds and so on you enter something with various parameters. So, as Ferret ask for, it can be considered as static damping. As already mentioned, fluid behave differently depending speed, temperature... so the damping coefficient will be different at high speed suspension movment.
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Since I am not a graduate engineer (although I wish I was!) this goes a little over my head...
I did do a little calculation myself, purely on the surface areas, and it seems to me that a difference in diameter of 0.13mm between piston and body (as you measured on the Kyosho) gives a surface area roughly equivalent to 2x 1.1mm piston holes.
I assume that the calculation for laminar flow is a lot more complex than simply surface area where oil can pass?
So, to ask in complete laymans terms...
Do you think that the pistons you have measured make any significant difference to low-speed damping?