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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHticking noise during autocross
Reported or suspected cause
oil is retaining air and getting pumped back
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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Reported cause
The real problem is the oil is retaining air and getting pumped back to the lifters.
Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
I obtained service receipts for the valve lifter replacement which were all replaced 2 years ago because the previous owner was complaining about the same issue although, I am pretty sure he was only driving it on the road and not at a track or an autocross event.
Leading evidence: 'oil is retaining air and getting pumped back' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'oil is retaining air and getting pumped back' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace 2 years ago' (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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Reported cause · Original poster
I just went to Calabogie Motrsports Park last Sunday and the problem is still tehre after installing the Mantis Sport oil sump extension kit...
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Performed · outcome unconfirmed · Original poster
I obtained service receipts for the valve lifter replacement which were all replaced 2 years ago because the previous owner was complaining about the same issue although, I am pretty sure he was only driving it on the road and not at a track or an autocross event.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Performed · outcome unconfirmed
I'm on considerably less sticky tires now, but when I ran rs3s I heard it a couple times only when it was very very hot outside at a certain track.
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Suggestion
With this oil in my Turbo the oil pressure characteristics do not appear to change from those I observe when running 0w-40 oil.
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Replace 2 years ago
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Performed · outcome unconfirmed · Original poster
I obtained service receipts for the valve lifter replacement which were all replaced 2 years ago because the previous owner was complaining about the same issue although, I am pretty sure he was only driving it on the road and not at a track or an autocross event.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Don't overfill the engine with oil but do run the oil level at the max level with the max level obtained with the oil up to full operating temperature.
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16 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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Generation: 20261027T005001Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have had my 2000 Porsche 996 C4 for a few months now, and I have recently taken it to an autocross school as well as an autocross race. During these 2 autocross events, I have noticed that after a few runs, the engine starts ticking. It eventually goes away when the engine cools down.
During normal driving, even If I push it, I have never been able to reproduce the ticking sound. I obtained service receipts for the valve lifter replacement which were all replaced 2 years ago because the previous owner was complaining about the same issue although, I am pretty sure he was only driving it on the road and not at a track or an autocross event. When I bought it, at the inspection, I had them change the oil and they put Liquid Molly 0W40. The oil level is almost full (7/8ths). The first time it happened at the autocross school, I added a few 100ml of oil thinking that I was low (I wasn't) but the ticking did go away.
Has anyone ever had this problem? If you did, what did you do to fix it? Thicker oil?
Thanks.
Be prepared to hear diagnosis of everything from scored cylinder(s) to impending engine failure! Whatever you do, don't overfill your oil - it won't do anything to help your situation and it could cause damage. It seems that even though we carry over 9 qts of oil in these motors, if you make a lot of high g type maneuvers (which I guess you could do at an autocross) the oil gets in the upper and outer parts of the motor/heads, potentially leaving other areas drier than normal. The oil also gets really hot and thinner than it might like to be normally (thermal breakdown/shearing). This may be leading to your ticking noise. Keep the oil fresh and keep it clean.
It reads like the engine is telling you it doesn't like auto-crossing.
That is the resulting hot oil, high g forces, high RPMs, aerate and thin the oil to the point one (or more) lifters get aereated oil and this is the result of the ticking.
If you want to continue to auto-cross you can try a "thicker" oil. There is an approved 5w-50 oil (not a typo for 15w-50!). I run this in both my Boxster and my Turbo. You can try this oil but it may not help. With this oil in my Turbo the oil pressure characteristics do not appear to change from those I observe when running 0w-40 oil.
I'm not a fan of oil additives but you can try Swepco 502 oil improver, too.
However, if these work, and there's no guarantee, they are just bandaids. The real problem is the oil is retaining air and getting pumped back to the lifters. The problem is this aereated oil is also gettiing routed to the main/rod bearings. These won't tick, though. One will just fail at some point.
So you need to address the oiling probably by installing a deeper oil sump with *proper* baffling. Whatever oil you end up running be sure it is fresh when you show up at the auto-cross event.
Don't overfill the engine with oil but do run the oil level at the max level with the max level obtained with the oil up to full operating temperature.
If all I wanted to do is autocross, I would probably have better lap times, and be less costly. However, I am planning on bringing the Porsche to a local track...
So, it seems that I need to add baffling to my oil pan to prevent aeration. After doing some research, it seems there are a few options available.
So far, I am leaning towards either the FVD Motorsport oil pan or the Mantis Sport oil sump extension kit. Anyone have any opinions?
With a 30% US/CDN exchange rate, these solutions are starting to get expensive for a few hours of track time here and there... but this is the reason I bought the car.
I was under the impression that the improved baffle design of some of the aftermarket pans was to ensure that the pickup tube remains submerged by controlling slosh, not necessarily affecting aeration.
I have also read that mesh is used in some oil pans to promote nucleation - is that a feature of any of the aftermarket pans?
Nucleation probably isn't the right word, but I couldn't come up with one word that was "like when you stick your finger in a cup of fizzy Coke, but for oil."
At least one other fast 996 at local autox events has this issue too, driver says his car has been like that for years. I'm on considerably less sticky tires now, but when I ran rs3s I heard it a couple times only when it was very very hot outside at a certain track.
Ticking is usually gone after a brief cool down drive. One of the other guys says his does it for a day or two after autox though.
I just went to Calabogie Motrsports Park last Sunday and the problem is still tehre after installing the Mantis Sport oil sump extension kit...
The ticking noise started after my second 20 minute session. By the time I drove back home (about an hour), the ticking went away. So, probably not oil starvation after all... but still concerning.
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