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<blockquote data-quote="Dieselbenz1" data-source="post: 10458" data-attributes="member: 840"><p>Inlet valve diameter 38mm exhaust 35mm. Material to be removed .3 mm tolerance plus .1 need to verify after removal.</p><p></p><p>Some engines use valves that are hollow and the void is filled with sodium. Sodium boils at around 900 degrees at the seating face of the valve then as the vapor travels up the stem it condenses similar to a mini AC system. This is very effective in removing heat quite often used in preformance engines and air cooled engines. Only problem is if fractured under load they pack a real punch and engine replacement likely results. They are to be disposed of as an explosive device just think pressure cooker without safety valve and 9 times the force. Not meant to be re ground.</p></blockquote><p></p>
[QUOTE="Dieselbenz1, post: 10458, member: 840"] Inlet valve diameter 38mm exhaust 35mm. Material to be removed .3 mm tolerance plus .1 need to verify after removal. Some engines use valves that are hollow and the void is filled with sodium. Sodium boils at around 900 degrees at the seating face of the valve then as the vapor travels up the stem it condenses similar to a mini AC system. This is very effective in removing heat quite often used in preformance engines and air cooled engines. Only problem is if fractured under load they pack a real punch and engine replacement likely results. They are to be disposed of as an explosive device just think pressure cooker without safety valve and 9 times the force. Not meant to be re ground. [/QUOTE]
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