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Re: [T3] Stretching valve stems?


> The sodium valves are mostly empty, with just a bit of solid sodium in them.
At
> operating temps, the sodium boils and carries heat very effectively to the top
> (stem end) of the valve, where it condenses. It then runs back down to the
head
> end by gravity and the shaking of the valve.

Ah, ISTR doing some calculations on such heat pipes with water inside, to
calculate the thermal 'conductivity' of the system.  Can't remember if it worked
out better than solid or not, though.  Steam transfers a lot of heat, so I guess
it's probably better.

Dave.
UK VW Type 3 & 4 Club
http://www.hallvw.clara.co.uk/
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