well my car started misfireing so pulled the plugs and cyl 2,3 were oil soaked did a leakdown and the heagasket was blown on 2,3 so pulled the head today and on cyl 2 theres a chip at the top of the sleeve were the heagasket was blown look closer and it looks like the frm material is coming off at the top of every cyl., i had it bored to 87.25 and honed for the mahle pistons at a local machine shop is this from them honing it wrong or what could make this happen? it feals like concrete on the top of the sleeves any that can give me accurate info please help

 

anyone?

 

post pics.

 

cant upload right now but wilk asap, pulled the pistons out above the first oil ring to the top of the pistons are scared from the material coming off of the sleeve wtf the only thing i can figure is they honed it more on the top and took off to much material some one please help

 

That is what happens when you bore FRM sleeves. The problem is you do not know how much coating is on the cylinder. In stock form it is already fairly thin. When the block was bored it probably removed too much coating. You still can sleeve the block and use any forged piston.

 

i know its still sleevable but im trying to figure out if the machine shop screwed the walls up, it has less than 900 miles on the build and the pistons are trash now so if its there falt i want them to take care of it

 

isn't 87.25 pushing it on an H22?

Could be a combination of boring the block incorrectly and adding all the extra heat and pressure of an FI motor.

Did the machine shop know that FRM sleeves are not your average sleeve? There is a service bulletin from Honda that has instructions on how to bore the sleeves. It almost sounds like boring the block is a last resort.

 

87.25 is still within the service limit of the H22 block. im actually hoping to drop my block off in a few mins to get honed for a set of oversized mahles. i already had one shop take the block and then call me back 30 minutes later to tell me they cannot do it after all. but i wound up getting connected with some serious automotive ballers in the process so it wasnt all bad. what piston to wall clearance did you get?

 

there are to many conficting statements on this forum
i thought the H22 H23 COULD NOT be bored or honed?? due to fiber reinforced walls

 

I believe there's a special kind of cutting device(stone?) that has to be used on frm sleeves and not to many shops have it. I've heard of people ordering it from honda, hope this helps, Maybe instead of mid's from darton you can get some new liners.