Quote Originally Posted by HatchHero
yes fiber reinforced matrix sleeves are a pain but the strongest for NA application.. someone with skill (GOOD SKILL) can hone a h22. only company that i know of is mahle that has pistons that mate with frm!
yea mahle pistons are coated. The reason FRM sleeves are hard to hone is because on top of the fiber material there is a coat of chromoly steel. Thats what the piston rings contact. The FRM itself is too soft. If you hone the chromoly too thin it will wear though to the FRM material and your engine will have massive amounts of blow-by and will lose compression very quickly.