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2011-2014 Mustangs
2011-2014 Mustang Talk
Boss 302 vs 5.0 difference
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<blockquote data-quote="seank" data-source="post: 12440399" data-attributes="member: 137223"><p>Some information I found on hollow/sodium filled valves, while looking into how they were made because I didn't know. Pretty interesting.</p><p></p><p>Hollow valves</p><p></p><p>Hollow outlet valves are mainly used for lowering the temperature in the particularly vulnerable fillet area and are additionally filled with sodium. A desired and positive side effect is a reduction in weight. Hollow, unfilled inlet valves are only used for this reason of mass reduction. In order to achieve a temperature decrease for valves, the skirt that is drilled hollow is filled with sodium by approx. 60 % of the volume and closed by a friction welding procedure. Sodium melts at 97.5 °C, has a density of 0.97 g/cm³ and is a very good heat conductor.</p><p></p><p>During engine operation the sodium becomes liquid and is moved backwards and forwards in the skirt by the inertial forces. This is also called “shaker effect” in this context. In this process, the sodium transports a proportion of the heat generated during combustion from the valve head to the skirt area. Here, the heat is dissipated via the valve guide. Temperatures on the valve head can thus be decreased from 150° C to 80° C.</p></blockquote><p></p>
[QUOTE="seank, post: 12440399, member: 137223"] Some information I found on hollow/sodium filled valves, while looking into how they were made because I didn't know. Pretty interesting. Hollow valves Hollow outlet valves are mainly used for lowering the temperature in the particularly vulnerable fillet area and are additionally filled with sodium. A desired and positive side effect is a reduction in weight. Hollow, unfilled inlet valves are only used for this reason of mass reduction. In order to achieve a temperature decrease for valves, the skirt that is drilled hollow is filled with sodium by approx. 60 % of the volume and closed by a friction welding procedure. Sodium melts at 97.5 °C, has a density of 0.97 g/cm³ and is a very good heat conductor. During engine operation the sodium becomes liquid and is moved backwards and forwards in the skirt by the inertial forces. This is also called “shaker effect” in this context. In this process, the sodium transports a proportion of the heat generated during combustion from the valve head to the skirt area. Here, the heat is dissipated via the valve guide. Temperatures on the valve head can thus be decreased from 150° C to 80° C. [/QUOTE]
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Boss 302 vs 5.0 difference
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