Specifically sodium-filled in a misnomer, they should be called Sodium-cooled valves...
An exhaust valve with a hollow stem that is partially filled with metallic sodium. When the valve gets hot enough (138°C), the sodium melts and moves up and down in the valve stem. The sodium absorbs heat from the hot valve head and carries it away to the outer part of the stem and then into the valve guide in the cylinder head and next to the cylinder head itself. This circulation cools the valve head and thus the valve is allowed to run at a lower temperature.
Simple...
How2 - explain sodium filled valves...
Moderator: Robsey
How2 - explain sodium filled valves...
Elwood Blues: "Our Lady of Blessed Acceleration, don't fail me now!"
Gaz loses sleep for my car and helps me with parts at ungodly hours of the day. Awesome
Gaz loses sleep for my car and helps me with parts at ungodly hours of the day. Awesome
Re: How2 - explain sodium filled valves...
you have too much time on your hands
now running a swedish vauxhall...
the old cav vid
http://www.youtube.com/watch?v=YYC4wHjqAhw
the new saab vid
http://www.youtube.com/watch?v=h-K5L6UDGFk
the old cav vid
http://www.youtube.com/watch?v=YYC4wHjqAhw
the new saab vid
http://www.youtube.com/watch?v=h-K5L6UDGFk
Re: How2 - explain sodium filled valves...
far far too much...
Elwood Blues: "Our Lady of Blessed Acceleration, don't fail me now!"
Gaz loses sleep for my car and helps me with parts at ungodly hours of the day. Awesome
Gaz loses sleep for my car and helps me with parts at ungodly hours of the day. Awesome