Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 25. MECHANICAL (STi) 11. Sodium-filled Exhaust Valves

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11. Sodium-filled Exhaust Valves


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W1860BE.book Page 16 Tuesday, January 28, 2003 11:01 PM




                                           SODIUM-FILLED EXHAUST VALVES
 MECHANICAL


 11.Sodium-filled Exhaust Valves
 Each exhaust valve contains pure sodium in its hollow stem. Sodium has high thermal conductivity.
 The entrapped sodium will liquefy at high temperatures and move inside the stem as the valve is
 operated. Thus the sodium will effectively transfer heat from the valve head to the valve stem, con-
 tributing to cooling down the valve head faster.




                                                          (1)
                                                                             ME-00750


                       (1) Pure sodium




                                                                ME(STi)-16



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