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engineer.white · Posted: Tue Jun 30, 2009 9:07 am Post subject: 931 exhaust valves sodium filled?

Are the 931 exhaust valves sodium filled? If not did anyone make them for the 931?
David
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1981 924 turbo/931
1982 924 turbo/931
1986 911 turbo/930

hitbyastick · Joined: 25 Jun 2009 Posts: 51 Location: Livermore, CA

Not an expert, but I believe so.
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1982 Porsche 924 Turbo

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

That is the rumor, but I believe it is largely unsubstantiated at the moment. I'm not aware that anyone has sliced one open.
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erstwhile owner of just about every 924 variant ever made

engineer.white · Posted: Tue Jun 30, 2009 11:25 am Post subject:

Back when I worked on my Saab 99 turbo, the factory manual had disposal directions for the exhaust valves. Drill 1/8" hole axially though the head of the valve into the hollow sodium filled section. Then toss valve in a bucket of water. Did it a few times expecting more excitement, there was only a little bit of bubbling. So anyone have a spare exhaust valve you care to drill a hole in for the sake of science?
David
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1981 924 turbo/931
1982 924 turbo/931
1986 911 turbo/930

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Been done apparently.

In this thread:
http://www.924board.org/viewtopic.php?t=25769&postdays=0&postorder=asc&highlight=valves+sodium+filled&start=0

John Brown wrote:

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

John's oversight was to do the experiment at room temp. Valves must be heated for sodium core to liquefy.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

John Brown · Joined: 07 Nov 2002 Posts: 903 Location: Leesburg VA

Min · Posted: Tue Jul 07, 2009 4:55 am Post subject:

if you still have the cut pieces, you could just heat them with a propane torch

Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

Rich H · Posted: Tue Jul 07, 2009 5:22 am Post subject:

It'll make you jump if you try that.... Chuck it in a bucket of water and it'll fizz.
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

John Brown · Joined: 07 Nov 2002 Posts: 903 Location: Leesburg VA

Am I the only one who finds it remarkable that Porsche would have used sodium valve stems and NOT list same in the tech specs or Turbo repair volume?
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John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82