https://dev.z31library.com/index.php?action=history&feed=atom&title=Forums%2FZ31P%2Fz31-performance-upgrade-forums_engine-mechanical-aa%2FPiston_wear 2026-08-15T14:40:09Z Revision history for this page on the wiki MediaWiki 1.43.8 https://dev.z31library.com/index.php?title=Forums/Z31P/z31-performance-upgrade-forums_engine-mechanical-aa/Piston_wear&diff=5118&oldid=prev 2026-05-15T05:11:32Z

<p>Forum archive import (z31performance)</p> <p><b>New page</b></p><div>{{ForumImport<br /> |op_user=Lykoi<br /> |op_date=2011-05-10 02:01:27<br /> |post_count=6<br /> |archive_url=/Z31performance_archive/forum/z31-performance-upgrade-forums/engine-mechanical-aa/14338-piston-wear.html<br /> }}<br /> <br /> &#039;&#039;&#039;Lykoi:&#039;&#039;&#039; &lt;small&gt;(2011-05-10 02:01:27)&lt;/small&gt;<br /> <br /> Well, the deeper I go the more i find. I can&#039;t find a mark or scratch in the cylinder, but this wear is pretty obvious.<br /> <br /> I&#039;ve decided to replace the piston, but i figured I&#039;d throw up the pictures as I&#039;m still not sure what caused this… My bet is carbon is the culprit as most anything else would show on the cylinder wall or the heads.<br /> <br /> (cylinder 5)<br /> <br /> ----<br /> &#039;&#039;&#039;260DET:&#039;&#039;&#039; &lt;small&gt;(2011-05-10 08:53:10)&lt;/small&gt;<br /> <br /> Maybe the engine was &#039;rebuilt&#039; using that piston already damaged?<br /> <br /> ----<br /> &#039;&#039;&#039;Careless:&#039;&#039;&#039; &lt;small&gt;(2011-05-10 08:55:43)&lt;/small&gt;<br /> <br /> ^ agreed. it would be visible on the walls if it was after the fact. although aluminum is much softer than cast iron bores- they would still show scuffing at the very least.<br /> <br /> ----<br /> &#039;&#039;&#039;Shuman47:&#039;&#039;&#039; &lt;small&gt;(2011-05-17 22:38:39)&lt;/small&gt;<br /> <br /> The pistons in my spare engine all had similar wear. The cylinder walls were clearly worn as well. Do your other pistons have wear like that?<br /> <br /> ----<br /> &#039;&#039;&#039;Lykoi:&#039;&#039;&#039; &lt;small&gt;(2011-05-17 22:59:51)&lt;/small&gt;<br /> <br /> {{Quote|user=|}}<br /> <br /> Only place it&#039;s noticeable is the bottom of the cylinder here the grooves show in the carbon buildup. No marks anywhere in the metal of the cylinder wall… And no, cylinder 5 is the only one with any marring.<br /> <br /> ----<br /> &#039;&#039;&#039;Shuman47:&#039;&#039;&#039; &lt;small&gt;(2011-05-17 23:11:20)&lt;/small&gt;<br /> <br /> {{Quote|user=|}}<br /> <br /> Could be this</div>

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