Sodium Valves? |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Sodium Valves? |
stugray |
Nov 18 2012, 12:45 PM
Post
#1
|
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 |
ConeDodger |
Nov 18 2012, 02:19 PM
Post
#2
|
Apex killer! Group: Members Posts: 23,623 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California |
In theory. The sodium does keep the heat out but I would answer the question this way; 40 year old sodium valves - bad. New - good. Finding them? Not so easy. So there you have it. SS is probably a close second.
Also, is yours a race engine? VW purposely made the later engines run hot with the cam they used. You can probably change cams and take more heat out of the equation than the sodium filled valve stems. What could go wrong? Drop a 40 year old valve in your new heads, destroy a head and piston and more than likely a cylinder. |
Lo-Fi Version | Time is now: 17th June 2024 - 10:37 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |