First time I heard of this theory... IMS

[356Guy]

It comes down to risk tolerance. Since there is no definitive cause/s the only prevention is some sort of replacement or upgrade program. Some people can sleep without having the upgrade done and others can't. I wish I were of the later type. I suppose many are oblivious to the issue which is even better. I'm trying to buy a car with the upgrade or at least one priced well enough that it makes sense to get it done. Its interesting to note that all the sellers I've communicated with so far don't believe the upgrade is necessary

[JFP in PA]

Originally Posted by 356Guy

Its interesting to note that all the sellers I've communicated with so far don't believe the upgrade is necessary

Probably because they personally have not experienced the loss associated with one failing. When you have to face an owner and tell them that they are facing spending more on his or her dream car than it is actually worth because of a failure, you begin to understand the reality of an IMS failure.

[jaykay]

I was an early adopter.....it's almost time to retro fit the dual row, retro fit if corrosive wear is an issue....Is it? Fresh Motul oil every winter storage; <5000km intervals. I am way under mileage wise.

IIRC one car in the facility undergoing the operation had a failed bearing come out while there...was able to play with failed bearings at the desk....it does happen.

The information I have for five chains: Driving style affects actuation of the vario cam solenoids which affects radial load the ims bearing. The load ramps up every time you drop below 3K as the solenoids phase the cams for low rpm operation. This increased cyclical load could contribute to other factors, precipitating a failure

[paulofto]

Nothing like an IMS or oil post. Over 30 entries in 24 hours!

Although it has been discussed in countless threads the IMS issue is always a good read.

BTW, had mine done at ~84,000KM (~52,000M) along with clutch, flywheel and RMS. The original bearing came out 100% fine but doing the work was the best peace of mind money can buy.

[jaykay]

Originally Posted by paulofto

Nothing like an IMS or oil post. Over 30 entries in 24 hours!

Although it has been discussed in countless threads the IMS issue is always a good read.

BTW, had mine done at ~84,000KM (~52,000M) along with clutch, flywheel and RMS. The original bearing came out 100% fine but doing the work was the best peace of mind money can buy.

......it is wintertime no one is out driving

[Nine8Six]

Originally Posted by jaykay

......it is wintertime no one is out driving

LOLOLOL I'll revise my "odds" mathematics... completely forgot about that

[mikefocke]

Originally Posted by 356Guy

It comes down to risk tolerance. ... Its interesting to note that all the sellers I've communicated with so far don't believe the upgrade is necessary

Now if I were selling a car and it didn't have something, what would I tell you about the importance of that something?

[boxxster]

Don't know if there is any truth to this, but I was told by a tech at the local porsche dealer that the m96 does not like to be stalled and that stalling these engines is hard on the IMS bearing. I forget how he explained it but essentially the more you stall your car the higher the chance of IMS failure. Again, I can't substantiate any of this, its just another theory (of many) that I've heard.

[JFP in PA]

Originally Posted by boxxster

Don't know if there is any truth to this, but I was told by a tech at the local porsche dealer that the m96 does not like to be stalled and that stalling these engines is hard on the IMS bearing. I forget how he explained it but essentially the more you stall your car the higher the chance of IMS failure. Again, I can't substantiate any of this, its just another theory (of many) that I've heard.

There have been a lot of possible theories mentioned in this respect; low miles, lack of aggressive driving, running the engine at 3,200 to 3,400 RPM for prolonged periods, and so on. I'm not sure how pertinent any of these ideas really are, or how much data is available to support them.

As a technician, you learn not to place a lot of credibility in unconfirmed operating parameters, and to focus on identifiable or confirmable commonalities in failures, such as the difference in failure rates between the single and dual row units, or off center case openings, which were also a major issue in the early RMS failures on the M96.

[356Guy]

Originally Posted by Nine8Six

Also, Jeff, has anyone (or yourself personally) ever asked a Porsche Eng/official what could be the reason(s) behind the failure? ....

prohibited I would think

Originally Posted by mikefocke

Now if I were selling a car and it didn't have something, what would I tell you about the importance of that something?

Oh I get it