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YOUR RESEARCH996 blown motor
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Suggestion
Does you car smoke when you start it back up after a hard run on the track?
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Suggestion · Original poster
Not sure of the ultimate cause but I was running R-comps, which may have contributed.
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Suggestion
Sounds like you are having fun with the test drives.
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I considered building it faster but the math really didn't work for me and I personally feel most comfortable with a dry sump oiling system.
Just sold my car as a roller today.
I only had the car a few months, and had done the LNE IMS bearing and X51 baffles. First DE of the year; I heard a bang and coasted to a connector road. Turned out I trailed oil and coolant all over the track.
Brief autopsy by my shop showed thrown rod, cracked block and broken crank. Ugh. Not sure of the ultimate cause but I was running R-comps, which may have contributed. No indications of problems before-hand.
Anyway, disappointing for sure, and just venting here. I plan on getting back into a race car, one with a true dry sump. And meanwhile, consoled myself by putting in an order on a new '13 Boxster S.
This is very sad to hear
This is one of the main reasons that I take my car only once or twice a year to open track. I run it hard, without being abusive and give it plenty of rest between sessions
These cars were made to run, and they are about the best car to do it in
Good luck with the Boxster S
I see plenty of 996 at the track with R compound at the track and no real problem, but I bet that the track configuration plays a role too. if you have long high speed turn where lateral g forces can be maintained for 4 or 5 seconds at time I assume the oil starvation problem could arise.
Lots of horror stories lately on the 996 forum. I'd be curious to know how much you sold the roller for.
IMS uprage is not the ultimate weapon, extended warranties still have a role
Ah that sucks. What track?
I don't know what I would do in your situation but I'd probably spend the money to build it better, faster, stronger. My wife might feel differently though.
It was at High Plains Raceway, no long sweepers. Agree re: warranties! I considered building it faster but the math really didn't work for me and I personally feel most comfortable with a dry sump oiling system. Phil, I'll PM you what my car went for...
My understanding is that oil starvation occurs on long left hand sweepers and the car is on racing slicks. If you were on Nitto or Toyo R compounds, like NT-01 or RA1's, then the odds are that you had a different issue contribute to the failure.
No matter, it still sucks to hear this. Did you consider a new motor, or were you just ready for a new car?
Yup, NT01s. Maybe it was a D chunk or slipped sleeve, not sure. Maybe the new owner will tear into the motor and can let me know.
I considered a replacement motor but I'd really be SOL if it happened again (I know, very unlikely), so decided against it. A Raby motor would've provided good peace of mind but they are... not inexpensive.
On another note, I test drove a Cayman S and literally frightened the sales guy twice, heh heh (he was fairly new to Porsches). I may have to go do "test drives" regularly this summer (July build slot for the S, this is gonna be hard) while I'm sans-Porsche.
Man I am sorry to hear about the blown engine but good to see you moving forward with a great attitude. Sounds like you are having fun with the test drives. The new generation Cayman definitely interests me and I will have to take a look at it down the road.
I noticed the oil pressure needle taking dips last time at the track, and yes, a long lefthand sweeper. Just regular street Pirelli's. Is Accusump the recommended way to go?
I track my 996 also. Based on all the research I have done, engine failures from oil starvation requires 2 things. 1.) Long left hand sweepers. 2.) Using racing slicks. Then enough G force can be generated to completely empty the pickup point. Street tires won't come close to that kind of laterial forces. And neither will DOT R compounds like RA1's or NT-01's.
So unless you are planning on racing slicks, there are cheaper ways to get extra protection / peace of mind. I was lucky and found a RL'er selling a new X51 oil pan. Alternatively, LN Engineering has a deep oil sump kit, and frankly it may be better for DE's than the X51.
I'v data log my oil pressure many times through Cal Speedway's long banked T1-T2. 18 degrees of banking and I'm on slicks and flat out at around 152 in 5th entering the turns. I have the X51 oil pan only and I see only a slight drop in pressure. I see more of a drop hitting the brakes hard on a flat track from anywhere above 100mph. I now keep the revs up as I downshift...
Odd. I've done more than a fair share of DEs on my car over the 8 years and never an issue. I do have an X51 oil pan for a last couple of years, but I also make sure the oil level is always at the top during the course of an event and it almost requires some topping off between 2 days.
Sorry to hear about the attrition.
Does you car smoke when you start it back up after a hard run on the track?
Mine does for about 3-5 seconds and I've been told this can be minimized if I run it with a little less oil. Just curious as to what you see on yours?
Fernando, mine used to smoke after start up also. Replace your AOS when you can. I found that if I did a long cool down or let motor idle for a few minutes after a session I wouldnt smoke as much.
After installing new AOS I have no smoke whatsoever.
I would love any more information on the "oil pressure in the turns" thing. I've watched many 996s during DEs/track sessions and the gauge(s) do dip down to 2-3bar in turns almost regardless of RPM. I don't know the significance of this, or what causes it?
RE: Smoking at start up after track sessions. I've seen several 996s do this and many that don't. I find the failing AOS a plausible explanation but didn't try that.
I will be digging in soonish and will keep you all posted on the findings. I picked up a 3.4 leftover from a 3.6 swap today.... I will do my best to treat that car right.
