First time I heard of this theory... IMS - 986 Forum - The Community for Porsche Boxster & Cayman Owners

mikefocke · 01-28-2017, 04:25 PM

Quote:

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 · 01-28-2017, 04:41 PM

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 · 01-28-2017, 06:10 PM

Quote:

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.