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> > Like most metals, machining stainless just requires that you know how to deal > with it. I'm not a machinist, but the place where I used to work had a BIG shop > and did a LOT of work in stainless. There, it was considered run-of-the-mill. > If you're really after tough strong materials, there are steels which are 3 > times the strength of any stainless alloy. > > I was actually making a rather unimportant part on the lathe this afternoon. > The material I had was just hot rolled steel and it was quite awful: soft and > gummy. This makes it hard to get a decent finish. I know I've done much better > with some stainless parts I've made, and, like I said, I'm not a machinist. > > I wish I knew more about this, as it applies to valves, but I really don't. It > may just be that stainless valves are slightly lighter (it is somewhat less > dense) but I don't think the difference is that significant. Valve weight IS > important, however, when you start talking high RPMs and high lifts. > > OTOH, just like steels, there are lots of different stainless alloys. There may > be some that are particularly good for valves. For those who advertise valves, > do they ever mention which alloy they use? > stainless are known for thier ability to take more heat than standard valves. they may be softer at low temps but apparantly when they get really hot they will still work ok. are the standard valved sodium stemmed? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org