ok so am replaceing the piston rings on my b18b and on the top of the piston it has .8 on every piston, i done some research and found that it means that my pistons are 81.08 but cant find any info on what rings to use with this poston so do i just use the stander size or over size .25 or .50 any info will help thanks

 

Get the std (standard size) for 81mm, you will be fine.

 

81.08 is not a size. If you haven't replaced the pistons then they are standard size 81mm and call for 81mm rings.

 

So what dose .8 on the top of the pistons mean???

 

No idea. Are the pistons stock? Do you have a picture?

 

 

If you havent bored out the block you will need standard size. Ignore those numbers.

 

That is usually just to designate that that piston was for a USDM engine, etc. As everyone else has stated: if your engine has never been apart then use the standard size rings. Should rehone the cylinder too.

 

Ok thanks for the info
What rings do you guy recommend? Is ther any good aftermarket ones? This is my daily driver about 40 miles a day I drive it normal no racing or bashing on it thanks for any input

 

OEM all the way. Make sure you or whoever is building your engine measures cylinder specs to make sure you are within service limits. And always check ring end gap.

 

And also make sure who ever builds it doesn't put like a 240grit hone job on it. That is way too rough for the thin honda piston rings. I think factory service manual calls for something like 400grit but don't quote me on that. I sent a block off to get honed one time and it came back with about a 200grit job. Had to send it back to be redone. Somewhat my fault for not mentioning what grit to hone it at, but the machine shop was cool and took care of it free of charge.

 

Yes the OEM service manual calls for 400 on the final hone.

 

I have nipping piston rings on my built b18c and they rev to 9 rpm every day with no problems. But if u have cash then I would go with OEM.