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stugray |
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None ![]() |
I was once told by one of the resident "experts" on this forum (who has not been around lately) that I should replace my sodium filled valves with stainless. However after visiting the local RSR racing mechaninc (who is machining my case and inspecting my heads), HE said that he goes out of his way to FIND sodium filled valves for race engines. He said that on Air-cooled engines, the sodium helps pull the heat from the heads.
Any comments or suggestions regarding sodium vs. stainless? I also heard that a simple change from two-angle to three-angle valve seats can increase flow by more than 20% with no other changes to the heads. Good news is that I should be re-assembling the engine without the deck height problems over thanksgiving weekend. Hope to have it running by Xmas. (IMG:style_emoticons/default/piratenanner.gif) Stu |
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shoguneagle |
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shoguneagle ![]() ![]() ![]() Group: Members Posts: 1,180 Joined: 3-January 03 From: CA, OR, AZ (CAZOR); New Mexico Member No.: 84 Region Association: Northern California ![]() |
I, also, will give you a little hint. STAY WITH THE SODIUM FILLED VALVES!!!! Rsearch it and I believe you will find the sodium provides much better heat transfer than stainless steel. If you have not had any trouble with the sodium ones and they are in good shape, stay with them. Never had any problems with seats or dropped valves on either my 914s or Alfa Romeos. Always rebuilt with sodium ones.
The sodium allows heat to be transferred from the valve edges up the stem via internal stored sodium and out the valve train, or something like that. Itis also used in some solar energy systems as a storehouse of heat until it is needed to generate electricity during the night time. Steve Hurt |
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