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914World.com _ 914World Garage _ Fire-rings?? Not the camping kind...

Posted by: Britain Smith Oct 27 2003, 12:32 AM

Has anyone heard of something call a fire-ring?

I have the aluminum 98mm cylinders with small steps in the top lips. I have been told that they are for fire-rings to allow for expansion of the heads and cylinders when heated. I also believe that they are used on later 964/993 motors, but I am not sure. Can anyone provide me with some info on these? There are more pictures than this one on my website...

http://www.britainsmith.com/Porsche/TurboMotor/Cylinders/index.htm

IPB Image

Posted by: Brad Roberts Oct 27 2003, 12:35 AM

Take a black marker and "paint" the lower lip so I can use a pointer and 'point' out what your talking about. It doesnt show up in the pics very well.

B

Posted by: Britain Smith Oct 27 2003, 12:51 AM

Did you look at any of the other pics on my website...I included a link above.

-Britain

Posted by: Brad Roberts Oct 27 2003, 12:57 AM

Yes.. and THEN I replied. It doesnt show what we need.

B

Posted by: Britain Smith Oct 27 2003, 01:00 AM

Alright, I will do that tomorrow.

For the time being...does anyone else have any idea?

-Britain

Posted by: Brad Roberts Oct 27 2003, 01:02 AM

Its 11'o clock at night and I asked this question on Pelican over a year ago with the same pics.. nobody knew what the hell I was posting (not even Jakester).

B

Posted by: GWN7 Oct 27 2003, 01:38 AM

Isn't that what they call the extra copper gasket? Like a head gasket, but it goes on the cylinder?

Posted by: Britain Smith Oct 27 2003, 12:50 PM

I found out that they are actually called Niresist head seals and used on 964 turbo motors. I also determined that they are typically made out of stainless steel.

-Britain

Posted by: TimT Oct 27 2003, 03:17 PM

Nirosist rings

Also used on Hiperf 930s, a groove is cut into the top of the cylinder, and another groove it cut in to the head. then the ring is fit and everything is torqued up, forcing the ring home (its kind of an interference fit). It helps keep compression gasses in the cylinder.