Quote:
Originally Posted by Jeff Alton
I don't know the history/accuracy of the blue paint tales. But I can say that cylinder scoring is quite common. I would say more common than IMSB failures. We are rebuilding a few scored cylinder motors each year now, and only one IMSB failure (which had an aftermarket bearing- go figure).
We have another 2006 cayman S coming shortly with cylinder scoring, a 997 coming as well shortly. My wife just called a local used car dealer about a 2008 Cayman they had only to find out it has a scored cylinder. I have personally owned 2 cars with scored cylinders (2008 Cayman S and 2005 997 S).
If you are buying one of these cars and purchasing an aftermarket warranty, please make sure the coverage amount per claim will cover the engine rebuild cost. We have seen a couple cases where a client thought he was covered only to find out his warranty did not cover even half of the cost...
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I would bet a new hat that this cylinder scoring issue is not a manufacturing defect of any kind, but would be more likely attributed to disrespectful, less than knowledgable owners with absolutely no "mechanical sympathy". Folks that will be hard on the gas, running right up to redline on a cold motor right after pulling out of their driveway, and that sort of thing. I wonder just what percentage of new Porsches, or new performance cars of any make, suffer this mistreatment. I bet it is a pretty significant percentage.
Maybe Porsche should introduce a cylinder head temperature / oil temperature monitoring system that interfaces with the throttle and ignition. Limit throttle opening and rpm's, gradually increasing both limits as the engine warms up. That would likely really piss off some of their customers, and they would probably try to override it. But, if they did, the warranty is voided. I bet that would clear up a lot of these "defective Porsche" issues.