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AJS Porcupine History
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<blockquote data-quote="Magnetoman" data-source="post: 97183" data-attributes="member: 2806"><p>Pure silver has a thermal conductivity roughly 2x higher than pure Al, which is why an engineer thought to use it. Silver actually isn't all that expensive (today, if an Ag head weighed 5 kg the cost of the material only would be $2.5k), and no matter what it could be returned to a smelter at the end of the season and melted down, so cost wasn't a factor. Unfortunately, materials science was and the engineer with the clever idea to use it had missed that class in his studies. </p><p></p><p>Pure silver is soft so it has to be alloyed to make it hard enough to be useful, but alloying lowers the thermal conductivity. By the time enough alloying elements had been added to the silver to make it hard enough for holding valve guides and seats in place its thermal conductivity had been reduced to be close enough to that of Al alloys that there was no advantage to using it.</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 97183, member: 2806"] Pure silver has a thermal conductivity roughly 2x higher than pure Al, which is why an engineer thought to use it. Silver actually isn't all that expensive (today, if an Ag head weighed 5 kg the cost of the material only would be $2.5k), and no matter what it could be returned to a smelter at the end of the season and melted down, so cost wasn't a factor. Unfortunately, materials science was and the engineer with the clever idea to use it had missed that class in his studies. Pure silver is soft so it has to be alloyed to make it hard enough to be useful, but alloying lowers the thermal conductivity. By the time enough alloying elements had been added to the silver to make it hard enough for holding valve guides and seats in place its thermal conductivity had been reduced to be close enough to that of Al alloys that there was no advantage to using it. [/QUOTE]
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