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On 12 Nov 2005 at 12:51, Dave Hall wrote: > Worn guides allow the valve to seat off-square, which I guess increases the > stress on that part of the stem. Certainly that's the thinking behind valve > heads breaking off. Is it a reasonable assumption to expect that some > elongation might occur before fracture? That seems reasonable, but I'm hoping that someone will tell us that under certain circumstances an exhaust valve can actually stretch 4-6 mm without breaking. Personally, I doubt it. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~