Reasons for rings not "Seating"

[old guy]

too smooth?that might be an ra of 4 or 5 with a 5/64 cast ring.typical; finishes these days will have an ra[roughness average]of 8-15 or so with an 18 to 22 degree crosshatch angle,an rk of 20-25 rvk of 40 or less and rpk of 30 or less.point being that the days of backyard stuff are numbered and you will see more and more that just don't work anymore.ring technology has progressed to the point that your engine guy needs to know the type of ring [1/16 ,1.5mm,1mm,nitrided,stainless etc]and the vehicles intended use[na,blower,turbo,street,race]to correctly asess and apply the right wall finish for you.he needs to have good equipment and a profilometer or other device to measure wall finish or the odds of sucess get small...