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On Fri, 2005-10-28 at 12:34, Jim Adney wrote: > > Not quite true. The damping material is still oil, they'er just using the > compressed N2 to keep the oil under compression so it won't cavitate, and to > keep the shock from sucking air in around the shaft seal. > > There's a LOT of misunderstanding about this, but the best way to think of > these would be to start describing them as gas over oil, rather than just > "gas." > > There is no way that gas alone could give enough friction here to be useful. > > BTW, I was surprised to find that the damping piston in these is sealed against > the wall of the cylinder with a metal ring that is just a small piston ring. I > was expecting a rubber O-ring, but that wouldn't last. The steel ring, running > immersed in oil, lasts a long time. This is what I meant. That gas filled shocks are gas over oil, and that the gas was under pressure. -- Russ Wolfe '71 FB AT '66 FB MT '64 T34 (not running) '65 T1 (not running) '05 KIA Sorento SUV russw@classicvw.org http://www.classicvw.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~