I am having my spare block built with oversized pistons. I need to know what grit to finish the cylinders.

 

your machine shop should take care of that....... or are you machining it???

 

I just spent 5k rebuilding my h22a4. I talked to a few people, and all of them said that you can't just overbore those blocks. From what I have heard, the have some special coating on the cylinder walls, which means you have to have the block sleeved. Hope this helps. If I am wrong, please correct me, but this is what a bunch of people including honda techs have told me.

 

I seen a guy that took a hone tool and kept honing the cylinder walls to fit the oversized type s pistons. Is that a bad thing??

 

you know my machine shop has me gettting all the info for the build. my local honda dealer has most of the info, but the don't build motors. they just do head work like head gaskets etc.

I thought that it had to be sleeved also because of the frm lining. but i am using honda stock oversized pistons, which are 0.25 over. Apparently that is not alot to take off the walls. so I am having it done. Hey if honda sells them why shouldn't it be done. it seems that if if was not a good thing to do honda would not sell them.

 

you are right.
Honda sells the .25 overbore so that if there is scaring in the sleeves, you can take .25 off the sleeve to smooth out the imperfections, and replace the pistons. i would ahve my machine do this tho

 

The .25 overbore pistons are for if there's minor scratches in the cylinder walls, or if the block has high mileage and the walls have worn a good bit. When you hone, it takes some material so the .25's don't take much more to make them fit.

I remember seeing the procedure to hone, you use a certain oil and a relatively fine hone.

There's no prob. with honing the cylinders to fit the pistons, as long as he checks the piston to cylinder wall clearances.

 

600 grit non-ferrous stone.If you tried to hone the block with a home hone to fit the over sized pistons,i would doubt the cylinders would still be perfectly round.just spend the extra cash,have someone who knows what there doin do it....unless you plan to be the local mosquito exterminator