Originally Posted by ap72
I appreciate you being civil about the ring issue, but all of the data collected by all of the major car manufacturers shows that you're wrong. They're switching to thinner rings for a reason- more power, better sealing, less bore wear, and as a result better emissions. Many of them are also switching to steel rings (a lot of foreign cars have used steel rings for decades).
The singular advantage thicker rings have is cost. for sbc's a cast iron 5/64ths ring set is still the cheapest set by a LONG shot.
This is true but it's all being accompanied with changes to better materials inclusive of the ring, piston and bore, reloacted ring positions and changes not only to oils but lubrication systems as well. So retrofitting this technology into old engineswill take a coordinated effort to make changes that let this modern stuff survive. It just might not be possible to get away with in a thin wall gray iron block without some "Rocket Science" changes to the bore materials and a heavy duty redesign to some details of the lubrication system like indexed squirters onto the underside of the piston. This can easily take you down a crazy road that the average hobbest hot rodder that comes here for help probably doesn't have enough VISA card limit to be able to afford this modern stuff.
But by any current standard the 5/64th ring package is way obsolete. But there must be a bazillion leftover pistons that were originally made back in the 1970's still on the market with this groove width. If your not turning over 6000 RPM, feeding the thing laughing gas or methanol these old rings will still get the job done for the average guy's budget.