Sodium filled valves are used fairly extensively on bigger piston type
aircraft engines. It's purpose is to aid in the dissipation of heat from
that portion of the valve that is in the combustion chamber (valve face)
up through the valve stem into the rocker space where the valve stem
contacts moving oil which scavenges the heat and transports it to the
oil cooler or other cooler parts of the engine.

No reason to think it wouldn't be desirable on smaller engines as well.
Even our beloved Wasserleakers.

John Rodgers
88 GL Driver

Dave Baker wrote:

> Sodium-filled valves.  There's a neat concept.  Can anyone tell me why
> they would want to do this? Dave in KC (who is learning tons of new
> stuff from the members on this list!)85
> Westy http://members.fortunecity.com/davebaker1/westy/westy.htm

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