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Original Message
Interesting Question
By John - 08/03/2004 9:37:14 PM; IP 142.177.6.165
This is what I found looking up on the internet....

"The exhaust valve stems are sodium filled for optimum cooling. Sodium, when related to valves refers to the stem
of the valve being hollow and filled with metallic sodium. This trick goes
back to high performance aviation engines. Sodium is a dense metal that
melts at temps near the combustion temp of a gasoline engine. When cool, it
is a solid that gravity will force to the head of the valve. As it heats up,
it changes to a vapor and absorbs heat due to "Heat of Vaporization". As a
vapor it rises within the valve stem to the guide area where it transfer the
heat to the head and then cools to a liquid, runs down and the process
repeats. This lowers the temp of the valve head."

I would assume Sodium was the best choice without much thought of longevity as they were meant for racing engines. Though Porsche has used them for street cars. Alfa Romeo also I hear.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=22308&Reply=22308><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor22308" onclick="return false;">How much hp were lightweight valves worth on a CJ</a>&nbsp;-- <font color=#0000ff>blinker, <i>08/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=22308', contentMargin: 60, icon: $('anchor22308') }); </script>  How much hp were lightweight valves worth on a CJ -- blinker, 08/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=22313&Reply=22308><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor22313" onclick="return false;">RE: Nothing.</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>08/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=22313', contentMargin: 60, icon: $('anchor22313') }); </script>  RE: Nothing. -- Gerry Proctor, 08/03/2004
 Lightweight valves -- Travis Miller, 08/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=22316&Reply=22308><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor22316" onclick="return false;">Why Sodium?</a>&nbsp;-- <font color=#0000ff>Bill Howell, <i>08/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=22316', contentMargin: 60, icon: $('anchor22316') }); </script>  Why Sodium? -- Bill Howell, 08/03/2004
Collapse <b>Interesting Question</b>&nbsp;-- <font color=#0000ff>John, <i>08/03/2004</i></font>Interesting Question -- John, 08/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=22318&Reply=22308><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor22318" onclick="return false;">RE: Interesting Question</a>&nbsp;-- <font color=#0000ff>Travis Miller, <i>08/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=22318', contentMargin: 60, icon: $('anchor22318') }); </script>  RE: Interesting Question -- Travis Miller, 08/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=22320&Reply=22308><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor22320" onclick="return false;">Does this means</a>&nbsp;-- <font color=#0000ff>pop428, <i>08/04/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=22320', contentMargin: 60, icon: $('anchor22320') }); </script>  Does this means -- pop428, 08/04/2004
 My problem is my CJ has them -- blinker, 08/04/2004
Collapse <a href=../ForumFE/reply.aspx?ID=22323&Reply=22308><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor22323" onclick="return false;">RE: To the contrary.</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>08/04/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=22323', contentMargin: 60, icon: $('anchor22323') }); </script>  RE: To the contrary. -- Gerry Proctor, 08/04/2004
 I have a full set of NOS light weights : ( n/m. -- pop428, 08/04/2004
Collapse <a href=../ForumFE/reply.aspx?ID=22328&Reply=22308><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor22328" onclick="return false;">RE: To the contrary.</a>&nbsp;-- <font color=#0000ff>Travis Miller, <i>08/04/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=22328', contentMargin: 60, icon: $('anchor22328') }); </script>  RE: To the contrary. -- Travis Miller, 08/04/2004
Collapse <a href=../ForumFE/reply.aspx?ID=22331&Reply=22308><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor22331" onclick="return false;">RE: Replace the guide.</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>08/05/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=22331', contentMargin: 60, icon: $('anchor22331') }); </script>  RE: Replace the guide. -- Gerry Proctor, 08/05/2004
Collapse <a href=../ForumFE/reply.aspx?ID=22350&Reply=22308><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor22350" onclick="return false;">ABout how long does it take to..</a>&nbsp;-- <font color=#0000ff>blinker, <i>08/06/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=22350', contentMargin: 60, icon: $('anchor22350') }); </script>  ABout how long does it take to.. -- blinker, 08/06/2004
 RE: ABout how long does it take to.. -- blinker, 08/06/2004
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