Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I've noticed lately, hard stainless steel slick finished liners being used with rubber O-rings as that combo doesn't go thru a break-in....I would think metallic piston Rings would break-in better with traditional cross-hatch honed, iron cyl Liners...Once you get 'er runnin steady & clean, maybe fab up some tuned exhaust headers & a tuned Ram intake manifold !!  That motor got a tach yet ? ......tom.