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Day at the track ended early...smoking engine….AOS?

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Old 03-21-2019 | 01:13 PM
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Originally Posted by docmirror
Well, my friend, I'm sorry to give the bad news, but if this is the yellow aero coupe - then the patient is done for. Just PM me where I can pick up the rusty, non-running hulk, leave the keys and pink slip on the seat and wave goodbye. I'll handle it from here...



<serious> Hope it goes ok. Sounds like a lot of oil got packed up in there, and overwhelmed the ability to separate, then dumped a bunch into the intake and through the top end.
Yep....as blue chip says....old news and old thread. KABOOM was two years ago....sorry to disappoint but car is healthy with a 997S engine and an additional 100hp😀
Old 03-21-2019 | 05:00 PM
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Yes, I was aware. Just trying to horn in on a most excellent C2 in the proper color. I gave it a go...
Old 03-21-2019 | 05:08 PM
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Did you pop the plenum apart to see if you have any oil pooled in the common oil pool points? If so, you may want to get that drained out - there's theoretically enough oil volume to hydrolock the engine, though smoky puffs is probably a much more likely result...
Old 03-21-2019 | 07:16 PM
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Originally Posted by docmirror
Yes, I was aware. Just trying to horn in on a most excellent C2 in the proper color. I gave it a go...
Lol....nice try😁
Old 03-23-2019 | 01:29 PM
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Originally Posted by lowpue
That is what i thought and then ....KABOOM! At my next track day....😢
What was the reason for the kaboom?
Where there any warning signs while on the track that you can look back on?
Old 03-23-2019 | 04:19 PM
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Have you looked into the Motorsports AOS,? I can run full dipstick with no issues on my FSI 4,0 Stage III. I know they are expensive, but they work.
Old 03-25-2019 | 11:29 AM
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Originally Posted by NYoutftr
What was the reason for the kaboom?
Where there any warning signs while on the track that you can look back on?
Every now and then i saw a puff of smoke on the track coming out of a turn once or twice per lap....everyone said its aos...too much oil. so net track day i lowered oil level to half. Same symptom and kaboom on a long right sweeper. one of My rod bearing had disintegrated. Crank shaft for that piston was completely worn.
Old 03-25-2019 | 11:58 AM
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Originally Posted by lowpue
Every now and then i saw a puff of smoke on the track coming out of a turn once or twice per lap....everyone said its aos...too much oil. so net track day i lowered oil level to half. Same symptom and kaboom on a long right sweeper. one of My rod bearing had disintegrated. Crank shaft for that piston was completely worn.
Were you running a deep sump prior to the kaboom? Racing oil? Just curious.
Old 03-25-2019 | 04:08 PM
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Everyone answered your question already but FYI there was a TSB from Porsche on this about reducing the oil level from 9.25 to 8.75 and then performing a DME program to ensure the low oil light doesn't come on.
Old 03-25-2019 | 04:40 PM
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Originally Posted by lowpue
Every now and then i saw a puff of smoke on the track coming out of a turn once or twice per lap....everyone said its aos...too much oil. so net track day i lowered oil level to half. Same symptom and kaboom on a long right sweeper. one of My rod bearing had disintegrated. Crank shaft for that piston was completely worn.
Where you doing any oil analysis on the car before this happened?

What was determined that caused the bearing failure?

How many miles on the motor?
Old 03-25-2019 | 08:14 PM
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Most likely oil starvation. Those long right sweepers and oil pressure drop I saw on my car is the reason I don’t track my car any longer. Porsche 996 = racecar, not.
Old 03-25-2019 | 08:42 PM
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Originally Posted by murphyslaw1978
Most likely oil starvation. Those long right sweepers and oil pressure drop I saw on my car is the reason I don’t track my car any longer. Porsche 996 = racecar, not.
yep, oil starvation was the cause on the 54k miles car. Of those miles probably 20% was track miles. it had no deep sump.
Old 03-25-2019 | 08:49 PM
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Originally Posted by thurstonpowers3
Everyone answered your question already but FYI there was a TSB from Porsche on this about reducing the oil level from 9.25 to 8.75 and then performing a DME program to ensure the low oil light doesn't come on.
YES !! There was also a "new style" dipstick that was longer and the "full" mark was .5 liter lower and required a reprogramming of the cluster, to keep from overwhelming the AOS during high G forces. I think a better solution would have been keeping the oil out of the AOS in the first place. With all the track starvation issues that we are seeing, I'm wondering if SOME people are using the "new style " dipstick and programming and also lowering the level to half full, resulting in being a full liter low on oil?
Old 03-26-2019 | 02:40 PM
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Originally Posted by lowpue
yep, oil starvation was the cause on the 54k miles car. Of those miles probably 20% was track miles. it had no deep sump.
Wow
10k for track miles that is a lot for a street car
Did you do all of those?
Old 03-26-2019 | 04:22 PM
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Originally Posted by NYoutftr
Wow
10k for track miles that is a lot for a street car
Did you do all of those?
no....previous owner did most of those track miles....i had car since 47k for past 7 years....i have primarily been using car for track. over the four years everything has been replaced. time every mechanical thing has been replaced



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