sodium-cooled exhaust valve

sodium-cooled exhaust valve
The exhaust valves of some high-performance engines are filled with sodium to improve the heat dissipation from the valve stem to the valve guide, since the exhaust valve is subject to higher thermal loads than the intake valve

Dictionary of automotive terms. 2015.

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  • exhaust valve — [1] The valve through which the burned fuel charge passes on its way from the cylinder to the exhaust manifold. It is driven by the camshaft. When comparing an exhaust valve with an intake valve in the same engine, the part of the exhaust valve… …   Dictionary of automotive terms

  • sodium-cooled valve — 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… …   Dictionary of automotive terms

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