17 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRecent UOA
Reported or suspected cause
unknown
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
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Reported cause
It usually means something is wrong but the cause is unknown.
Leading evidence: 'unknown' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'unknown' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Disconnect clutch switch and always start' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
996 has an LN retrofit IMSB installed 3/2019 at 21,700 miles on the clock, car now sitting on 61,000 miles.
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Performed · outcome unconfirmed
The main bearings and rod bearings and thrust bearing is the only place tri-metal bearings are used, the cam bearings or just steel on aluminum, as is all the other bearings with exception of the bushing in the small end of the rod which is bronze/copper..
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Suggestion
Could be main ,rod or thrust bearings, one reason I always disconnect the clutch switch and always start with clutch out.
Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed
The main bearings and rod bearings and thrust bearing is the only place tri-metal bearings are used, the cam bearings or just steel on aluminum, as is all the other bearings with exception of the bushing in the small end of the rod which is bronze/copper..
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17 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T130754Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Interesting! Did you ask him why that is? I had quite a few email conversations with Lake and he is quick to respond to questions. One thing I've noticed is that you also consumed some of the additives that would typically build or see small fluctuations. This might mean that the oil is working harder to protect the engine and is consuming some of the additives. After a bit of a build period, your Moly had a decent drop off. Same goes for Zinc.
'We've been seeing that lately'. This is a red flag for me. I get this from our folks on the line from time to time when I point out new unknown noise in the data. It usually means something is wrong but the cause is unknown. In this case, he further states it is normal on the next test, so, it's likely some noise from the test. Did you drive the car any harder during this interval?
I always drive hard. The 996 has actually sat more than normal, less than 3k miles in 7 months, as I've been driving the 997 as my daily driver. This is my 996's 9th UOA since 8/2019 (covering 32k miles) and Tin has only registered on the past 2. I just got the report back on Saturday and haven't bothered to send Lake an email questioning the Tin level. No idea why some of the additives are showing a drop.
That's what I thought... Maybe ask him what value of Tin would be concerning or what other metals along with Tin would be bad. Agreed that there is no worry.
Not really sure what bearing the Tin would be coming from. 996 has an LN retrofit IMSB installed 3/2019 at 21,700 miles on the clock, car now sitting on 61,000 miles.
Could be main ,rod or thrust bearings, one reason I always disconnect the clutch switch and always start with clutch out. I would wait till next UOA to see a pattern.
Sure, tin is a soft "white metal" and is used as the outer layer on tri-metal bearings along with lead..
A tri-metal bearing has a thick steel backing, then a copper/bronze substrate layer , then a soft white metal layer of tin/lead that faces the crankshaft..
The main bearings and rod bearings and thrust bearing is the only place tri-metal bearings are used, the cam bearings or just steel on aluminum, as is all the other bearings with exception of the bushing in the small end of the rod which is bronze/copper..
The factory IMS bearing is all steel, races, *****, cages ect, some aftermarket bearings have ceramic *****, and some have brass cages ..The IMS Solution is a plain bearing like the crankshaft bearings and it has a soft white metal layer also of tin/lead...
What's strange about the UOA is the while the tin is elevated, the lead is not...( they should go hand in hand since they are mixed metal)
And with the comment that "they are seeing this a lot lately" and " it usually goes away on the next one" makes me believe the tin is not coming from the engine but rather in the oil its'self..
I have read a lot of research papers on "the cleanliness of oil" and there are many many standards for cleanliness and there are "categories of cleanliness " that are very defined in ranges... You would be surprised at how much "unwanted stuff" actually gets into "brand new oil" ......the old saying " cleanliness is next to godliness" is said for a reason...
I�d love to know the size of the batches these contaminants are found in. 2 or 10 thousand cases? A few ppm of silicon or nickel, etc will cause a lot of heart palpitations. For example, I did VOAs for Mobil 5w50 FS2 and Porsche Classic 5w50 at two different labs, with both oils having up to 6 ppm of aluminum and 4 ppm silicon. 6 ppm! That�s considered normal wear for a 3000 mile UOA.
Not a bad idea... I used to start my TR6 with the clutch out because the thrust bearings were known to prematurely wear in those engines. I might do the same with my 996 tonight.
Brotha... what Skip is trying to tell you is... you need to take a deep breath and relax, then drive your Porsche to the closest Waffle House and enjoy some good food and toothless wisdom.
I went to the local Waffle House 2 weeks ago !!!
.. I haven't been there in decades !!!!
A long time friend and fellow 996 owner I have known since he bought his 99 over ten years ago, ( He retired also 5 years ago after a double lung transplant) . He has started helping me built UAOS kits and is helping on the drafting on the UIDS updated baffle...
We were working late on the UIDS baffle at about 11pm he mentions getting something to eat...The Waffle House being the only thing open local ( except Whataburger) we went and had some scattered covered and smothered goodness...lol
