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<blockquote data-quote="PeterT" data-source="post: 10456" data-attributes="member: 22"><p>We probably have some automotive experts (not me) but I'm going to guess valves are pretty hard as the seats are always ground not turned. It could be expected the top of the stems is similar if they contact rockers or lifters. In a lathe environment I can visualize holding the stem in a split cylindrical collet of sort so only the end portion is sticking out of chuck. Then a toolpost grinder ran across the end. 0.3mm is about 12 thou so it wouldn't take many passes & leave desirable finish. Turning this off accurately & with proper finish even with carbide tool tip might be dicey but its just a guess. The chuck & spindle ID would have to be able to accommodate the diameter of valve itself so something to check. There may be a better method using a dedicated surface grinder and maybe more consistent lengths. Also examine any kind of chamfer or radius the current stem top has, you would want to replicate that.</p><p></p><p>homebrew solution</p><p><a href="http://www.mtfca.com/discus/messages/29/35243.html?1200779946" target="_blank">http://www.mtfca.com/discus/messages/29/35243.html?1200779946</a></p><p></p><p>(sodium filled valves are for increased heat transfer under higher temperature conditions)</p></blockquote><p></p>
[QUOTE="PeterT, post: 10456, member: 22"] We probably have some automotive experts (not me) but I'm going to guess valves are pretty hard as the seats are always ground not turned. It could be expected the top of the stems is similar if they contact rockers or lifters. In a lathe environment I can visualize holding the stem in a split cylindrical collet of sort so only the end portion is sticking out of chuck. Then a toolpost grinder ran across the end. 0.3mm is about 12 thou so it wouldn't take many passes & leave desirable finish. Turning this off accurately & with proper finish even with carbide tool tip might be dicey but its just a guess. The chuck & spindle ID would have to be able to accommodate the diameter of valve itself so something to check. There may be a better method using a dedicated surface grinder and maybe more consistent lengths. Also examine any kind of chamfer or radius the current stem top has, you would want to replicate that. homebrew solution [URL]http://www.mtfca.com/discus/messages/29/35243.html?1200779946[/URL] (sodium filled valves are for increased heat transfer under higher temperature conditions) [/QUOTE]
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