Quote:
Originally Posted by husker boxster
The new design IMSB has a much lower failure rate than the IMSB used from 2000-mid 2005. As usual, there are no solid numbers to go off of, but the consensus is the new design fails at a 1% rate vs the old at 10%.
That's why the IMS lawsuit only includes Boxsters to mid-2005. The new design does not fail enough to be included. Caymans were not part of the lawsuit because they all have the M97 engine.
So if you sweat over a 1% chance of something failing, then get a 987.2.
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Yes but once out of warranty, there's no cost-effective way to replace the new IMSB short of splitting the engine apart yourself. And no 1% bearing lasts forever, even if you remove one of the seals to allow for more oil flow. And this is not just any old bearing like those in your wheels...
general mechanical engineering principles would suggest that a service-able bearing should be replaced at a regular interval. I'm baffled as to what Porsche's "plan B" was here for out-of warranty cars. the Willy Wonka ever-lasting engine bearing? If you get rid of cars every year or two, unlikely to be issue.
Whereas with the old IMBS bearing, it's a very straightforward extraction everytime you change the clutch. Or, if you go with the LNE solution to replace the old bearing type, you eliminate the whole bearing issue just like the 987.2.
In other words, if you intend to own a 987.1 Cayman, Boxster or Carrera with the new m97 bearing long-term, you've got a problem with no solution ahead of you. Best to save up for the 987.2 Cayman/Carrera/Boxster or score a better deal on a 987.1 Boxster/Carrera which has already had the IMBS addressed (the sure bet way you know if it has a serviceable bearing or not). Don't know where that leaves the 987.1 Cayman since I gather the last of the old style IMSB's were gone by late 2005.