YOUR RESEARCHWhat are Squiggly Lines in Cylinder Walls
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I had a bore scope done on a 2000 996 engine with about 60K miles. The photos (attached) shows squiggly lines on four of the six cylinder walls. There was no bore scoring seen on any cylinder and the compression leak-down showed no leakage. We assumed, therefore that these were not cracks. But what are they? Is this a cause for concern? Could it be a ticking time bomb? Any thoughts would be greatly appreciated. Photo 1 Photo 2 Photo 3 Photo 4
They sure look like cracks... Hoping someone here with more expertise chimes in with good news for you!
That looks like a cracked cylinder to me
Here you go.
Not cracks, just squigley lines and they r very normal. Your bores look great.
De Jeeper Do you know what causes these lines? Chuckben
Quotes source post: 19110871
No but i assume the plating process as they r in every motor u have seen pics of. Maybe @Charles Navarro can help?
I did get input from LN Engineering (Jud, Charles & Jake): This is a normal occurrence in these engines and is nothing to worry about.
Huh, I'd be very interested in knowing what causes them. My logic was that there's a crack in the surface lining, probably not through the whole cylinder wall - a shallow crack would allow for material to deposit in there (like a tattoo ), making it visible.
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