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Bore Scoring

Indischrot

Spa-Francorchamps
Joined
3 Dec 2020
Messages
310
How worried should you be about bore scoring on a 957 Cayenne GTS?

I came across this on Rennlist and was wondering how accurate it is...

The very first thing you should do is check to see if the VIN you are looking at is on the list.. If it is, don't walk, run.

Here is the list from the TSB of engines through 2014 that have the newer structurally honed cylinders. Note that my 2008 that had a failure was not one of these, and smooth-honed.

"Only engines with structurally honed cylinder liners are used in vehicles as of the shown engine numbers:
References:
92AAH1, 92AA11, 92AAL1, 970110, 970111, 970120,
970121, 970410, 970411, 970420, 970421, 970430,
970431, 970440, 970441, 970450, 970451, 9PAAH1,
9PAAH7, 9PAAI1, 9PAAL1, 9PAAL7, 9PAAN1, 9PAAS1
Model year as of 2008"


Could the VIN be the signs of an engine that may end up with bore scoring??
 
All I know is that apparently the Turbo's V8's don't suffer from this due to an oil spray feed to the underneath of the pistons.

Could this be another IMS type problem, where cases were a lot lower than the Internet makes it sound?
 

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