Quote:
Originally Posted by Brad Roberts
Stop and go traffic kills the IMS bearing (after the grease leaves the bearing)
The constant in and out of the variocam on the passenger side of the engine stresses the IMSB.
Variocam comes in between 2850-3000 rpm. If you drive above this or below this, you have less chance of failure (we see no failures in the race cars as we are constantly above 3krpm)
People in LA going from zero to 40 to zero to 40 to zero to 40 in 1st gear, stress the IMSB BIG time. Each time the chain gets loaded in the 2850-3000 rpm.
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Gotta be honest Brad, I can't see that being a major factor in reality.
I'm not disputing the engineering argument. But very frequent transition past that rev range will be normal for the vast, vast majority of road-going Boxsters. And the vast majority of that vast majority doesn't suffer IMS bearing failure. So it can't be that critical.