carbide cylinder bore conversion (Bore Tech)

[Marc Piccioni]

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.

Regards, Greg
>
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