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<x-charset iso-8859-1>Hello- > My impression is that the convex lifters wear concave quite quickly and then > stop wearing (with good lifters, that is.) This is still slow enough that you > don't notice it at adjustment time. Once the lifter stops being convex and goes flat, it begins to drastically step up the amount of wear on the camshaft. By the time it's concave, there are some MAJOR problems. The study of tribology tells us that only convex lifters can be hydrodynamically lubricated by an oil film. This was the fatal flaw of VW's T4 engineering - they used flat lifters. That was dumb. So, since they couldn't lubricate, they went concave very soon, and proceeded to munch on camshafts all day long. Not pretty. Replacement with good convex units and a good cam typically eliminates the problem, in solid or hydraulic applications. Take care, Shad Laws LN Engineering - Aircooled Precision Performance http://www.LNengineering.com ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe </x-charset>