NC280z Posted April 14, 2020 Report Share Posted April 14, 2020 Hey all, I decided to sneak an inspection camera into my Z's engine during some routing tune-up procedures and found a nick in the cylinder wall of the #3 piston, near the top of the bore. Attached below is a photo of the damage. The car idles well and draws a steady 20" of vacuum once warmed up, though I've not yet done a compression test to see if this damage has affected the engine overall. I also searched the bore for any foreign objects and couldn't find anything, so I'm not certain what would have cause this damage. Is this something I should be concerned with and address quickly? Quote Link to comment
banzai510(hainz) Posted April 14, 2020 Report Share Posted April 14, 2020 As the day I’m Hawaii drive till Broke Quote Link to comment
datzenmike Posted April 14, 2020 Report Share Posted April 14, 2020 My $50 Z24 engine. Ran perfectly last time I ran it. I wouldn't give it another thought. The mark comes up higher than the top ring so probably a small chunk of carbon rubbing. Quote Link to comment
NC280z Posted April 14, 2020 Author Report Share Posted April 14, 2020 I appreciate the quick responses! I tend to drift towards the worst-case scenario when I notice things like this. I had a machine shop bore and hone the engine, and I reassembled/refreshed the engine with new internals about 7 years ago and never noticed the damage during the reassembly process. During today's inspection I also noticed deposits on all of the pistons (see below), but all of them have this same even coating of deposits, which I'm guessing is normal for an engine like this. My idle AFRs are between 12.5~13.5, so a bit rich. N42/N42 with flattops, so compression is around 9.69~1 and it's happiest when on the rich side. Quote Link to comment
banzai510(hainz) Posted April 15, 2020 Report Share Posted April 15, 2020 If you have a carb I run a cup of water thu it on a hot day and hope the steam clean will flake off the carbon pour a little at a time and rev the motor Quote Link to comment
Stoffregen Motorsports Posted April 17, 2020 Report Share Posted April 17, 2020 I have found that happiness in car ownership comes with a certain amount of ignorance. If you can learn to ignore things which are not affecting how a vehicle runs or drives, it's best to ignore them. There's an old saying that goes something like this - worry is a debt paid in advance on something that may never happen. Quote Link to comment
datzenmike Posted April 17, 2020 Report Share Posted April 17, 2020 Yeah, turn the radio up louder. Quote Link to comment
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