Correct piston rings?
04-14-2007, 09:32 PM
#1
Hey Man
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Correct piston rings?
I was going through my rebuild parts order and wonder if I was sent the wrong part. Are NA and turbo piston rings the same? I ordered 951 rings (std.) and the invoice says #951 103 901 02. The boxed rings sent (Goetze #08-323300-00) say they are for the 944, 928 -2.5/5.0L. There are clearly separate part numbers when you order them from places like Paragon and Pelican. Does Goetze make a separate ring set for the 944T and if so what is the number? Could it be Goetze only makes the turbo ring for all applications? This is my 1st 944 refresh and I want to be sure.
Thanks
Thanks
04-15-2007, 10:59 AM
#3
Hey Man
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Originally Posted by 9fitty1
NA rings and Turbo rings are NOT the same.
04-16-2007, 11:52 AM
#4
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I dont have the Goetze box in front of me to compare, but the Porsche part number for Turbo rings is 951 103 901 02. The N/A rings are a 944 103 902 .. part number. I recall my 951 Goetze ring set did say it was also for 928s on the box.
EBS does have and Paragon should have the 951 ring sets.
The N/A rings have a step in the #2 compression ring and the oil scraper ring is 3 parts. The Turbo rings have chrome plating on the top side of the #1 compr. ring, the 2nd compr. ring does not have a step in it, and the oil ring is 2 piece.
EBS does have and Paragon should have the 951 ring sets.
The N/A rings have a step in the #2 compression ring and the oil scraper ring is 3 parts. The Turbo rings have chrome plating on the top side of the #1 compr. ring, the 2nd compr. ring does not have a step in it, and the oil ring is 2 piece.
04-16-2007, 11:57 AM
#5
Race Car
I have the same set of rings mentioned in the original post. I had two sets that came with my rebuild kits (2 of them) from Zims a little over 3 years ago. If they are in fact NA rings, what would be the problems I could/would encounted in my turbo?
04-16-2007, 12:24 PM
#6
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Originally Posted by OriginalSterm
I have the same set of rings mentioned in the original post. I had two sets that came with my rebuild kits (2 of them) from Zims a little over 3 years ago. If they are in fact NA rings, what would be the problems I could/would encounted in my turbo?
Depending on who you ask, the non-chrome plated N/A rings may be prone to cracking in a Turbo application.
04-16-2007, 12:29 PM
#7
Race Car
Originally Posted by Oddjob
Depending on who you ask, the non-chrome plated N/A rings may be prone to cracking in a Turbo application.
Guess it's time for a compression/leak down test and consider this season over before it starts...
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04-16-2007, 12:48 PM
#8
Hey Man
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I was able to confirm this morning that the Goetze part number 08-323300-00 is the corrrect one for the turbo (also 944S and 928S4) despite what the box may say. The Goetze NA part number is 08-520400-10 for the (944 and 924S). Guess a few of us can rest easier now.
Excellent info on the visual ID 
Originally Posted by Oddjob
The N/A rings have a step in the #2 compression ring and the oil scraper ring is 3 parts. The Turbo rings have chrome plating on the top side of the #1 compr. ring, the 2nd compr. ring does not have a step in it, and the oil ring is 2 piece.
Last edited by KuHL 951; 04-16-2007 at 01:09 PM.
04-16-2007, 12:49 PM
#9
Race Car
Originally Posted by KuHL 951
I was able to confirm this morning that the Goetze part number 08-323300-00 is the corrrect one for the turbo dispite what the box may say. The Goetze NA part number is 08-520400-10. Guess a few of us can rest easier now.
04-16-2007, 02:43 PM
#10
There is a severe difference. The 944 rings, which have superceded he 928 100mm rings, so are same thing are cast rings, IIRC, as well, (as mentioned), the oil ring is three parts, and the second compression has a very thin lookiung champher ridge that sits against the bore. If there is a scratch, it will catch the scratch or particle, and I believe it will get damaged.
The 951 rings have the assembled oil ring, and both compression rings are much more robust looking.
There is also a price difference when you look at places like paragon products.
The 951 rings have the assembled oil ring, and both compression rings are much more robust looking.
There is also a price difference when you look at places like paragon products.
04-16-2007, 06:51 PM
#11
Three Wheelin'
I remember the na rings being thinner for top and middle. Maybe I am just thinking of the spacing between them though? Anybody know for sure? If not I will go out to the garage and measure.
04-21-2007, 11:18 PM
#12
Drifting
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I would be interested to know what the end gaps are. I have the same Goetze rings with that same part number. My bores are standard (100.01) and I just put the #1 and #2 rings in the first bore and they are measuring more than the spec in the manual for new, which is 0.20 to 0.40mm. The wear limit is 0.8. They are coming out between 0.4 and 0.54. I can't understand why.
Oddjob, i saw some posts of yours that you had the same situation and you used the rings since they were under the wear limit. Any problems?
Oddjob, i saw some posts of yours that you had the same situation and you used the rings since they were under the wear limit. Any problems?
04-22-2007, 03:05 AM
#13
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Originally Posted by Alpine951
I would be interested to know what the end gaps are. I have the same Goetze rings with that same part number. My bores are standard (100.01) and I just put the #1 and #2 rings in the first bore and they are measuring more than the spec in the manual for new, which is 0.20 to 0.40mm. The wear limit is 0.8. They are coming out between 0.4 and 0.54. I can't understand why.
Oddjob, i saw some posts of yours that you had the same situation and you used the rings since they were under the wear limit. Any problems?
Oddjob, i saw some posts of yours that you had the same situation and you used the rings since they were under the wear limit. Any problems?
06-04-2007, 07:16 PM
#14
FYI, there seems to be some old information in this thread. After researching this issue, it would appear that Goetze now manufactures only one set of rings for all of the 944 cars (they may have made some different sets in the past, but now there is only one). Here is the info from my supplier:
Thanks,
Wayne
The below piston ring is all we carry for ALL 944 applications. It has been superseded 3 times and in 1997 (blue numbers) it was combined from 3 numbers to just one. There maybe some of the old numbers being sold at some of the suppliers mentioned in that thread, but they are discontinued numbers and I would not know what is supplied in those cases.
Hope that helps.
Line: POR Part: 944-103-902-82 Mfg ID: 42 GOETZE
Mfr: 42 GOETZE Mfg Country: GERMANY
Mfr Part#: 08-323300-00 OEM ID:
Alt.Part#: OEM Country:
*----- Description -----* *----- Applications --------------
1. Piston Ring Set 924S (4 Per Car)
2. Standard (100.00 mm) 928 from '85 (8 Per Car)
3. 1.5 - 1.75 - 3 mm 944 thru '88 (4 Per Car)
4. 944S (4 Per Car)
5. 944 Turbo (4 Per Car)
_________________________________________________________________
Superceded by On Prior Part Number
1 11/19/97 92810390604
2 11/19/97 92810390620
3 3/27/01 92810390622
4 5/21/02 92810390628
Hope that helps.
Line: POR Part: 944-103-902-82 Mfg ID: 42 GOETZE
Mfr: 42 GOETZE Mfg Country: GERMANY
Mfr Part#: 08-323300-00 OEM ID:
Alt.Part#: OEM Country:
*----- Description -----* *----- Applications --------------
1. Piston Ring Set 924S (4 Per Car)
2. Standard (100.00 mm) 928 from '85 (8 Per Car)
3. 1.5 - 1.75 - 3 mm 944 thru '88 (4 Per Car)
4. 944S (4 Per Car)
5. 944 Turbo (4 Per Car)
_________________________________________________________________
Superceded by On Prior Part Number
1 11/19/97 92810390604
2 11/19/97 92810390620
3 3/27/01 92810390622
4 5/21/02 92810390628
Wayne
