[000Racer]

Awful lot of scuffing in the bore.
Re- hone it and chamfer the bottom of your bores smooth....
Let me guess, you got a full round design piston?
Put the extra weight you need in the wrist pin, minimum H13 pin with at least .220 Wall thickness.

 

[000Racer]

I agree, point it you can't really tell anything by looks. A lot of people think they have a great hone job by the looks and we are dealing with microns.

Yeah, 100 micro inches is .0001
I've been running stuff with 110 RVK and make more power and pull more vacuum.

 

[000Racer]

It takes good equipment but with the new coatings and ultra thin rings it gets very specific on the finish. I recently went from a diamond rough/ diamond finish to a diamond/cbn combo. The naked eye can't tell the difference bet the finish is much better when I measured it. Seems no to have as much rpk.

You'd be surprised what you can get away with, and I can achieve the same thing with my abrasive stones.... Recently did one with .9 .9 .2mm ring pack... Rvk was 100
Rpk was 15... Bitch made a lot of power, no smoke.... Shit ton of vacuum....
That profilometer is a pain in the ass. Never get the same reading twice even in the same spot not moved.

 

[000Racer]

Last on I did....
80 RVK, 14 RPK, 34 RK, sealed up right away, 22" vacuum.