namm

i bought a b18c block with darton sleeves however i noticed when i put .010" oversized rings in the bore they dont need filling, they already have a .008" end gap. Can this block still be used with standard 81mm pistons or do I have get oversized pistons too

Adriano

Has the block been used after it was sleeved or is it new? I would recommend getting it over bored or at least get it honed/check to make sure the cylinders wall are round. As for the piston/rings, check the specs with the manufactor and see if it falls withing their specs. Not all manufactor are the same.

Adriano

HiProfile

I'd suggest measuring the bore - pistons need a certain cleanace, depending on the mfg's recommendation. Chances are its been ovaled out. The .010 rings are not a good idea in a stock bore, as Honda rings are low tension, and that would likely put too much pressure on the cyl walls.

namm

I am aware that most piston manufacturers allow .004" piston to wall clearance. I would like to know how much bigger can piston to wall clearances be without causing exesive piston rattle

namm

bump

Muckman

iTrader: (2)

Umm none bigger. really.. no more than .004 bigger than the pistons.
If it is bigger, companies like swaintech offer a moly skirt coating that can be applied extra thick to take up some clearance.

tokesGTR

If the rings are slack with a 81mm piston chances are it could be an 81.5mm bore, .5mm is about 0.0197".

Muckman

iTrader: (2)

Make sure you have the right size rings too.