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The Terminator
Engine/Tuning
Looking for opinions on piston ring gap
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<blockquote data-quote="MalcolmV8" data-source="post: 15263695" data-attributes="member: 8854"><p>It's very hard for me to know for sure. Same shop machined and honed my block as before and he's done many others for me and been in business many years doing hundreds, probably thousands of others. Not to say mistakes don't happen but if my hone wasn't good and the rings didn't seat why did the top gapless ring seat so well? It has 0% leak down. I've never seen a ring seal so well in all my life.</p><p></p><p>I'm certainly not a ring expert which is why I've spent literally hours and hours reading articles, threads and other info I can find online trying to understand and educate myself in the process. I've found more than one article that explains how the 2nd ring's function is 85 to 90% oil control. This leads me to believe it's an important part of oil control and that the oil rings themselves cannot alone handle it.</p><p></p><p>Interestingly enough in the process of searching I found some articles referencing a production issue Chevy had at one time with their LS engines consuming oil. They changed the 2nd ring to a Napier design and it cured it. That right there tells me the oil control rings alone cannot cope with all the oil. Obviously they play an important roll but are not the soul source of oil control.</p><p></p><p>The valve stem thing is what Total Seal says. I agree deceleration from high RPMs will pull a very high vacuum. They say even higher with a gapless ring. Who knows. As for my seals, originally I had what ever the shop doing the head work put in there. Second time around I put in Felpros. No change in oil consumption.</p><p></p><p>I went ahead and ordered a new set of rings. The exact same thing I ordered when originally spec'ing out this motor actually before Total Seal convinced me to convert them to gapless. We'll see how it goes non gapless this time.</p><p></p><p>BTW didn't we cover the copy / paste thing prior to posting lol <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> this site locks up a lot on posting, it's a good save.</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 15263695, member: 8854"] It's very hard for me to know for sure. Same shop machined and honed my block as before and he's done many others for me and been in business many years doing hundreds, probably thousands of others. Not to say mistakes don't happen but if my hone wasn't good and the rings didn't seat why did the top gapless ring seat so well? It has 0% leak down. I've never seen a ring seal so well in all my life. I'm certainly not a ring expert which is why I've spent literally hours and hours reading articles, threads and other info I can find online trying to understand and educate myself in the process. I've found more than one article that explains how the 2nd ring's function is 85 to 90% oil control. This leads me to believe it's an important part of oil control and that the oil rings themselves cannot alone handle it. Interestingly enough in the process of searching I found some articles referencing a production issue Chevy had at one time with their LS engines consuming oil. They changed the 2nd ring to a Napier design and it cured it. That right there tells me the oil control rings alone cannot cope with all the oil. Obviously they play an important roll but are not the soul source of oil control. The valve stem thing is what Total Seal says. I agree deceleration from high RPMs will pull a very high vacuum. They say even higher with a gapless ring. Who knows. As for my seals, originally I had what ever the shop doing the head work put in there. Second time around I put in Felpros. No change in oil consumption. I went ahead and ordered a new set of rings. The exact same thing I ordered when originally spec'ing out this motor actually before Total Seal convinced me to convert them to gapless. We'll see how it goes non gapless this time. BTW didn't we cover the copy / paste thing prior to posting lol :) this site locks up a lot on posting, it's a good save. [/QUOTE]
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Looking for opinions on piston ring gap
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