[TheForge] Sodium filled valve stems?

[Andy Vida]

Shannell wrote:
> 
>  >They are used in the exhaust valves of large
>  > aircraft engines.
> 
> And high performance car engines

	I recall them used in auto engines from the 1930s era, but
	am unaware that they are used any longer.  They are heavy,
	comparatively difficult to make, and hazardous when they fail.
	They worked well in aircraft engines because those turn
	relatively low revolutions, like 2000 as opposed to 15000
	and more in some race engines.
--
	-Andy V.
	 Eventide Forge
	 Mad Science Inc.
	 Scottsdale, AZ

	foolish being...
	you can't get away with your snobbery any longer. Your thoughts on life
are 
	only thoughts coming from one person . Your opinion is only one out of
the 
	billions of other minds out there. You may think you can take over the
world 
	Pinky, but you will fail.

			-Seshat McDaniel, the daughter I never had that manages to
				          follow me around the house like a bad cold.