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FRM honing and boring procedure

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Old 02-16-2009, 03:10 PM
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FRM honing and boring procedure

Thought i would post this up as i found it to be very use full and hard to find.

FRM coating is possible to hone-bore but a few specifications have to be met.

let your machine shop know...

They need to use a Silicon Carbite 400-500 grit (recommended 500) stone.
for the apporiate finish, also there needs to be a 60 degree cross hatch.
Hone Head cannot exceed 45-50 rpm and needs 29-43 psi or 200-300 kpa.

For boring the nonferrous metal requires constant attention to detail
and stones must be cleaned every 2 cycles (every 5 for simple honing)
a chemical cleaning is not recommended after honing, v.a.t. clean or glass bead before honing-boring.
after machine work is done clean with soap and water. If using a pressure application do not let pressure exceed 30psi for direct cilinder wall contact.
a 0 weight oil is recommended for initial break in.

Boring limit is .25mm which is hardley anything if your looking to increase displacement by bore you would be better of re-sleeving, as the most you can gain is about 12ccs a 0.6% increase (hardly measurable on a dyno).
i recommended waiting on buying the below mentioned pistons until the machine shop determines how far they will need to go into the block to allow your rings to seat optimally, sometimes just a re-hone sometimes .20-.30 over you will need pistons of the right caliber.

For those of you who managed to escape having to re-sleeve but stil want to run a forged pistion with a raised comp ratio

it is possible with these and ONLY these as pistons known of as of 2-16-09

Remember there are many company's out there that claim there piston will work fine due to there level of silicon impregnitation on the piston skirt, however the number of engines destroyed vastly out numbers the builds that have been claimed to work fine.

someone may want to sticky this.
verified by
a.r.e.a. has the offical T.S.B. released by honda as well.
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