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<blockquote data-quote="RobinHood" data-source="post: 10460" data-attributes="member: 696"><p>Rolls Royce used sodium filled exhaust valves for improved valve temp control as early as 1929 in their engines that were used in the Supermarine Spitfires which took part in the Schneider Trophy Races in Europe. Not sure who first came up with the idea, but they are very common in aviation piston engines.</p><p></p><p>0.3mm (0.012”) is possible to grind off the head of the valve. It could be done with a fixture in a spindexer and a surface grinder or holding the valve in a chuck of a lathe and using a toolpost grinder. Ideally, the work would be done on a cylindrical grinder.</p><p></p><p>I take it that you don’t have adjustable tappets to set your valve clearance that way?</p></blockquote><p></p>
[QUOTE="RobinHood, post: 10460, member: 696"] Rolls Royce used sodium filled exhaust valves for improved valve temp control as early as 1929 in their engines that were used in the Supermarine Spitfires which took part in the Schneider Trophy Races in Europe. Not sure who first came up with the idea, but they are very common in aviation piston engines. 0.3mm (0.012”) is possible to grind off the head of the valve. It could be done with a fixture in a spindexer and a surface grinder or holding the valve in a chuck of a lathe and using a toolpost grinder. Ideally, the work would be done on a cylindrical grinder. I take it that you don’t have adjustable tappets to set your valve clearance that way? [/QUOTE]
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