 Fire-rings?? Not the camping kind..., small steps in the cylinders. |
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| Britain Smith |
 Oct 27 2003, 12:32 AM
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#1
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Nano Member  Group: Members Posts: 2,354 Joined: 27-February 03 From: Hillsboro, OR Member No.: 364  |
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... More pics of the cylinders... (IMG:http://www.britainsmith.com/Porsche/TurboMotor/Cylinders/images/130_3061_JPG.jpg) |
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| Brad Roberts |
Oct 27 2003, 12:35 AM
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#2
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
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.
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| Britain Smith |
Oct 27 2003, 12:51 AM
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#3
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Nano Member Group: Members Posts: 2,354 Joined: 27-February 03 From: Hillsboro, OR Member No.: 364 |
Did you look at any of the other pics on my website...I included a link above.
-Britain |
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| Brad Roberts |
Oct 27 2003, 12:57 AM
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#4
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Yes.. and THEN I replied. It doesnt show what we need.
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| Britain Smith |
Oct 27 2003, 01:00 AM
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#5
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Nano Member Group: Members Posts: 2,354 Joined: 27-February 03 From: Hillsboro, OR Member No.: 364 |
Alright, I will do that tomorrow.
For the time being...does anyone else have any idea? -Britain |
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| Brad Roberts |
Oct 27 2003, 01:02 AM
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#6
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
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).
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| GWN7 |
Oct 27 2003, 01:38 AM
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#7
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King of Road Trips Group: Members Posts: 6,280 Joined: 31-December 02 From: Winnipeg, MB, Canada Member No.: 56 Region Association: Northstar Region |
Isn't that what they call the extra copper gasket? Like a head gasket, but it goes on the cylinder?
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| Britain Smith |
Oct 27 2003, 12:50 PM
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#8
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Nano Member Group: Members Posts: 2,354 Joined: 27-February 03 From: Hillsboro, OR Member No.: 364 |
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 |
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| TimT |
Oct 27 2003, 03:17 PM
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#9
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
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. |
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