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Join Date: Nov 2006
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Intake and Exhaust Valves

Would one of you know what the difference is between the turbo cars intake and exhaust valves and those of the NA cars? When I read the section in Wayne's book, the '78-'89 911 and the '75-'89 turbo valves show the same dimensions. How does one tell except for the part number? I have read where the exhaust valves for both NA and turbo are sodium filled. There is a cost difference.
Thanks.
Old 08-10-2008, 06:59 AM
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sudo apt-get purge 930
 
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Join Date: Jul 2006
Location: Brandon, FL
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I asked this same question a while ago and never got a definite answer other than they handle heat better. I know a very respectable Porsche engine builder that has always used NA valves on the intake but turbo valves on the exhaust on the turbo engines he's built.

Stupid Question???
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Last edited by equality72521; 08-10-2008 at 07:30 AM..
Old 08-10-2008, 07:20 AM
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They are sodium filled
Old 08-10-2008, 10:44 AM
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I read where the exhaust valves are sodium filled and how to identify that they are, and that they are for the NA engines as well.
Old 08-11-2008, 12:43 PM
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