I'm in the process of building up a H23 Vtec but I'm confused about the honing of FRM.

This service bulletin:
SB618958 #18939

1990-2001 Prelude – Honing Fiber Reinforced Metal (FRM) cylinders 2000-01 S2000

All S2000 and 1990 and later VTEC and SI Preludes have Fiber-Reinforced Metal (FRM) cylinder liners. FRM honing is not required unless the cylinder has deep vertical scratches that run the length of the bore. Cylinders with light colored spots or flaking cannot be corrected by honing and must be replaced.

To hone FRM liners, perform the following:
· Use a rigid hone (not a ball hone) with GC-600-J or finer stones for nonferrous
metals. The honing pressure should be 200-300 kPa (2-3 kg-cm2, 29-43 psi).
· Use an oil type honing oil.
· Hone at 45-50 rpm to a 60 degree-crosshatch pattern.
· Do not stroke the hone more than 20 cycles.
· After honing, thoroughly clean the engine block of all metal particles by
washing with hot soapy water, then dry and oil them immediately. Never use
solvent; it will only redistribute the grit.
· Some light vertical scoring and scratching is acceptable if it isn’t deep enough
to catch your fingernail, and doesn’t run the full length of the bore. (rm,sn)


It states that 90+ VTEC/SI Preludes do not require honing. But does this mean with original rings or with new ones? I do not see any vertical lines or gouges on the cylinder walls.

Thanks

Ken

 

I would LOVE to know this too, mabe i will get some Type-S pistons. I just dont like the Honeing part.

 

Unless your block has only run low miles, your cylinders are probably glazed. Definitely, get a hone if your piston-wall clearance is ok. Otherwise, you should overbore and use .25mm+ pistons.

 

they wont seat right without a honing and you get bad compression and oil burn

I also rather be safe than sorry and not expensive to get done if you know the right builder.

 

i dont think that it is completely necessary but it would be a good idea.

 

its necessary if you want it to seal correctly. New rings means it needs to seat correctly. and it will not seat correctly on worn cylinder walls.

 

anyone know where in north carolina i can get this done