Sodium Valves? |
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Sodium Valves? |
stugray |
Nov 18 2012, 12:45 PM
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#1
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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 |
HAM Inc |
Nov 18 2012, 08:11 PM
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#2
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
QUOTE As far as 3 angle valve guides. The three angles are fairly normal in production cars now. Not true, I see many modern heads, and I can say that the one and two angle cut is still prevalent. Even the latest DFI 9A1 Porsche uses them on the exhaust, though the intake is more sophisticated than that. The Cayenne V8 only has 2 angles on in and ex seats. Honda, mazda, bmw, vw, porsche, mitsubishi all still use very simple one and two angle seat profiles. And most 4 valve heads are designed with throat size/valve size ratios high enough that there is no way a total of 5 angles can be squeezed in. |
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