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2006 STS V8 AWD, '95 Ford Ranger
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The picture may be just a little misleading. The major share of cylinder wear occurrs at the very top of ring travel not the bottom which is shown in the photo. I would be interested in seeing and measuring the ring ridge before passing judgement.
 

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The picture is not misleading at all. The discussion was about the original hone marks being visible @ well over 100K miles. Granted, the most wear does occur @ the top of the cylinder, but your looking at over 1/2 of the piston travel here as the piston is bottomed on the head. I hardly think your going to see these hone marks where they are and have a ridge at the top.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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Thanks for finding the way to resurrect the original article. I'll sticky this thread in Northstar for reference.

Please note that the original linked article in Post #23 was NOT written by GM or Cadillac so there may still be errors and subjective presumptions present.


FWIW, some of the longer replies in this thread were posted by a former GM Northstar Systems powertrain engineer.

Here's a more recent picture of a Northstar cylinder wall at 171,000 miles - top of the liner.
 

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