0Import RP

iTrader: (7)

Or at least according to this article:

http://en.wikipedia.org/wiki/Honda_B20A_engine

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">These sleeves are so strong that they often do not lose their factory cross-hatching marks after 200,000 miles! A lot of B21A1 engines burn oil and have low cylinder compression numbers because the FRM material is so strong that is tears up piston rings. Good news though, you can usually replace the piston rings without any honing to the sleeves and go another 100,000+ miles without any sleeve wear.</TD></TR></TABLE>

Yes this is about a B21A engine, but the FRM is the same stuff used in our H'series engines too. What do you think? Discuss.

I have a '95 H22A1 that has only 85k on it...wonder if maybe I should just use the proper A or B sized Type-S pistons for each cylinder instead of going with the .25mm overbore size...

Don Jefe

That "definition" goes against pretty much what is thought, and taught about, regarding frm sleeves, and from what i've seen, this guy couldnt be anymore wrong.

B/H motor regardless, I would need to see some SERIOUS, and EXTENSIVE proof in order to believe this.

prelittlelude

i would check the whole cylinder wall for out of roundness and egging, if the whole cylinder is within spec and up and down the bore in all 360 degrees i too have heard of honda shops just droping new pistons and rings in with no hones..

edit: it comes down to the condition of the cylinders, if they are out of spec then a hone might fix it, if they are way out, a bore then hone is needed.

alphajesse

A block with FRM will have much more ring wear than cylinder wear, but only an idiot wouldn't hone when replacing pistons and rings.

h22pwr

The Honda TSB on FRM honing procedures says that honing is ony required if there is damage to the cylinder walls.

Eddiebx

i dont kown about not loosing the crosshatchign after 200k. all the jdm blocks i've pulled apart were smooth as a baby's butt, and those have definitley under 100k

Honda318dx

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alphajesse &raquo;</TD></TR><TR><TD CLASS="quote">A block with FRM will have much more ring wear than cylinder wear, but only an idiot wouldn't hone when replacing pistons and rings.</TD></TR></TABLE>

Thats funny. I've seen more damage done to FRM sleeves by people who try to hone/bore them, and do it incorrectly. If the cylinders look good, I'll just pop new rings in, seems to work very well for me.