LN Eng retrofit post mortem
06-23-2011, 10:05 AM
#17
Rennlist Member
My car bought at 66K miles 4 years ago is one of the most reliable cars ever owned. I would buy the car with the dry engine over your #1 color combo. Example: I wanted black interior but settled for gray instead in a silver car.
06-23-2011, 10:12 AM
#18
Former Vendor
The person who experienced the AOS failure was at sea level where vacuum is the highest. The AOS can easily created enough vacuum on the crankcase to effect the oil being picked up in the sump in some driving conditions. While under deceleration the manifold pressure is as high as possible. The situation can also very easily end up creating aerated oil, which has no film strength.
We have seen this exact same thing occur many times, and like I said it happened to my own engine in 2009. Its the only mode of failure that I have ever directly experienced with my own Porsches.
I could not agree more in SOME instances. Our old test car was unreal, from start ups in 10F temps that took the car to redline (immediately)until it boiled over to running it for 4 hours straight on the chassis dyno till the exhaust system got so hot that the bolts holding the exhaust flanges together popped in half. That engine is still alive.
With proper preventive maintenance and a pro-active mindset the engines can live a super life and take tremendous abuse. Of course, just like with any engine, a hell of a lot of it is dependent upon luck.
We have seen this exact same thing occur many times, and like I said it happened to my own engine in 2009. Its the only mode of failure that I have ever directly experienced with my own Porsches.
These engines are stronger than you think....
With proper preventive maintenance and a pro-active mindset the engines can live a super life and take tremendous abuse. Of course, just like with any engine, a hell of a lot of it is dependent upon luck.
06-23-2011, 10:15 AM
#19
Burning Brakes
Not sure I understand what data you're looking for.
As somebody who has nothing to sell, to gain or to lose from anybody choosing to worry about the IMS bearing, let me also tell you that I'm driving an original bearing'ed 159k mile 996, which is my 3rd with over 90k miles (all on original bearings).
Also replaced a "perfect" factory bearing for somebody else. Through my work with other shops, I've seen 3 failed 996 motors (i'm seeking them out, and it's been somewhat rare to find one), none of them were an IMS issue. Also from my experience, I'd recommend a car that had a factory re-man'd engine, since the most likely issues w/these cars will not be catastrophic, instead things like AOS, starter, alternator, hoses, etc. will need replacement over time, which are all updated and newer in the case of an updated motor.
As somebody who has nothing to sell, to gain or to lose from anybody choosing to worry about the IMS bearing, let me also tell you that I'm driving an original bearing'ed 159k mile 996, which is my 3rd with over 90k miles (all on original bearings).
Also replaced a "perfect" factory bearing for somebody else. Through my work with other shops, I've seen 3 failed 996 motors (i'm seeking them out, and it's been somewhat rare to find one), none of them were an IMS issue. Also from my experience, I'd recommend a car that had a factory re-man'd engine, since the most likely issues w/these cars will not be catastrophic, instead things like AOS, starter, alternator, hoses, etc. will need replacement over time, which are all updated and newer in the case of an updated motor.
06-23-2011, 10:21 AM
#20
Burning Brakes
After reading your post(s) I don't think 996's are the right car for you.
06-23-2011, 10:48 AM
#21
Racer
Among the other early warnings provided by the "Guardian" are AOS and water pump issues on the list ?
06-23-2011, 11:13 AM
#22
Addict
Rennlist Member
Rennlist Member
Everyone who is freaked out about a 996 needs to remember that most of us don't log into this board (or any other) and post, "Omigosh everyone, guess what happened to me today? I took the car to work then took my wife to dinner in it and it DIDN'T BLOW UP!!!"
We usually only post here if there is a problem. So reading this board too much may lead you to believe that 996s suck and are completely unreliable. Keep in mind Porsche built a ton of these things and most of the owners don't even know about Rennlist, yet these cars continue to run on a daily basis. So take forums and the posts on them with a grain of salt. Sure there will be a risk since this is a car that is around 10 years old, but prepare yourself for the risk, be proactive with preventative maintenance and go out and enjoy yourself in your truly awesome vehicle.
Remember life isn't worth living if you're not going to take some risk for satisfaction!
We usually only post here if there is a problem. So reading this board too much may lead you to believe that 996s suck and are completely unreliable. Keep in mind Porsche built a ton of these things and most of the owners don't even know about Rennlist, yet these cars continue to run on a daily basis. So take forums and the posts on them with a grain of salt. Sure there will be a risk since this is a car that is around 10 years old, but prepare yourself for the risk, be proactive with preventative maintenance and go out and enjoy yourself in your truly awesome vehicle.
Remember life isn't worth living if you're not going to take some risk for satisfaction!
06-23-2011, 12:25 PM
#24
Hey Jake...can you answer a question for me?
How does the Cup AOS differ from stock? It's over 10 times the price...I was just wondering how it's better than the stock unit. Looking at photos, it just looks larger...but there has to be more than that.
Secondly, would the Cup AOS provide any more "long term" security over the stock AOS? (if indeed it is larger capacity) Or is it only advantageous in a true cup car?
Sean
How does the Cup AOS differ from stock? It's over 10 times the price...I was just wondering how it's better than the stock unit. Looking at photos, it just looks larger...but there has to be more than that.
Secondly, would the Cup AOS provide any more "long term" security over the stock AOS? (if indeed it is larger capacity) Or is it only advantageous in a true cup car?
Sean
Is there a convenient line or some place we can tap a vacuum sensor into to monitor irregularities? Dunno, just thinking out loud...
06-23-2011, 01:28 PM
#26
Burning Brakes
Will the IMS Guardian alert us of these failures too?
06-23-2011, 01:53 PM
#27
Former Vendor
Guys,
foor the last few days I have been in my office working on the paperwork side of the IMSG and have been by the computer for 14+ hours a day..
Thats not the case today, the rest of this week, or next week as I have a lot to get done in the lab before we close the entire week of the 4th for our summer shutdown.
I'll pop in when I can, but I have actual work to do after I finish my Lunch..
foor the last few days I have been in my office working on the paperwork side of the IMSG and have been by the computer for 14+ hours a day..
Thats not the case today, the rest of this week, or next week as I have a lot to get done in the lab before we close the entire week of the 4th for our summer shutdown.
I'll pop in when I can, but I have actual work to do after I finish my Lunch..
06-23-2011, 03:39 PM
#29
Former Vendor
06-23-2011, 05:37 PM
#30
Racer
Thread Starter
