carbide cylinder bore conversion (Bore Tech)

[Bruce Plecan]

-----Original Message-----
From: Marc Piccioni <mpiccioni at attcanada.net>
To: 'diy_efi at efi332.eng.ohio-state.edu' <diy_efi at efi332.eng.ohio-state.edu>
Date: Sunday, January 10, 1999 1:50 PM
Subject: RE: carbide cylinder bore conversion (Bore Tech)


>It would be interesting to take cylinder leakdown measurements at a regular
interval and determine ring seating/wear rates.
>
>----------
>From: Greg Hermann[SMTP:bearbvd at sni.net]
>Sent: January 10, 1999 10:00 AM
>To: diy_efi at efi332.eng.ohio-state.edu
>Subject: Re: carbide cylinder bore conversion (Bore Tech)
>
>>On Sat, 9 Jan 1999 14:02:03 -0700 bearbvd at sni.net (Greg Hermann) writes:
>><snip>
>>>Saw an ad in a pals copy of "Vintage Views", a vintage motorcycle racing
>>>as'sn. newsletter. It is some sort of a proprietary carbide conversion
>>>which they do to the surface of the cast iron. They mention thermal and
>>>friction advantages as well as "incredible" bore life.
>>>
>>>Regards, Greg
>>
>>Getting rings to seat must be "incredible", too :)
>>
>>Would you use cast iron, chrome, or molybdenum rings with a carbide bore?
>>
>>
>>Ray Drouillard
>
>I talked to Bore Tech about a year ago, Ray. They want the bores finished
>to their final size before you send them to them, and they want them
>POLISHED to about an 8 u-inch finish--no cross hatch pattern stuff!!!
>Obviously, this is a whole different ballgame from what we are used to!
>Chrome rings are supposed to be the ticket--clearly they are the hardest
>and longest wearing. My plan is to use forged pistons (from 2618 Al) and
>have them hard anodized about .002" thick, so as to get both high strength
>and excellent wear resistance (as well as the thermal advantages of the
>hard anodizing). Not common knowlege, but Cummins hard anodizes at least
>part of the pistons in some of their high horsepower 855's!
>
>Bore Tech claims that the rings will seat OK with conventional use, my plan
>is to come up a stray cylinder liner (from something else) which can be
>finished to the correct bore, and also carbide treated.  Then use the liner
>and an old piston (or make something) as a lap and a holder for the new
>rings, and hand lap the rings to pre-seat them prior to assembly of the
>motor.

I'd think prelapping them, and then plating would be the answer.
That way any machining errors are corrected, first, and then the
plating would be uniform, in thickness.  Anyone know for sure if the
final machining on rings for the OD is grinding?????.
Bruce
>
>Regards, Greg
>>
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