that second ring gap is a hair bigger than i have ever used myself
care to share your speed secret ( compression ring flutter at hi rpm ??.let a little oil past to help seal the top ring ??)
I can absolutely tell you that after experimenting on my own engines that assembling one bank after 'dipping' 4 piston assemblies in synthetic 5/40 penrite oil and just adding a smear of mineral penrite 15/40 'running in' oil on the other 4, then doing the 1st 1000km on Delo400 15/40 that all pistons and bores look just the same ! Amazing!Olds455 wrote: ↑Mon Dec 03, 2018 2:56 amWhy is everybody so against the use of synthetic oil? That's factory fill for many, many vehicles for multiple manufacturers. If it's so bad, why don't they all do the initial fills with Dino oil and demand that owners not use synthetic until a specified point? They use it from the moment the engine is assembled and nary a single problem due to using synthetic oil from mile 0. So why the big push to not use synthetic oil? Same reason you guys are so stuck on 70s technology?
Thanks for the follow up
It depends if the nick is below the surface or has a raised edge. If entirely below the surface, it’s not going to cause an issue.65dragster wrote: ↑Mon Dec 03, 2018 2:37 pmUpdate. I found a slight nick in #1 cylinder wall, maybe 1/3 down from top. It is enough to catch a finger nail. The bore-hone is fresh. Not sure what happened or whether to address it. I can post pics, if it is helpful. Run it or take back to machine shop to do another light hone? Thoughts?