In general you can expect the nitriding to improve the crank strength by at
least 25% and in the case of the TR-6, 50%. The wear factor improve a lot
and generally a great thing worth whatever the cost ( almost). (Well,
almost)
----- Original Message -----
From: "Jack W. Drews" <vinttr4@geneseo.net>
To: <SpiwakD@aol.com>; <fot@autox.team.net>
Sent: Friday, November 08, 2002 4:37 PM
Subject: Re: crank hardening
> I have my cranks nitrided by a company in Michigan that nitrides about 250
> cranks a week. They do all of Callies, Crowers, etc so it seems that they
> should know what they are doing. They use a gas ion nitriding process
which
> imparts the nitrided surface through a gaseous atmosphere. The crank is
> heated to about 400 deg, sufficiently below the temp at which other grain
> transformations or hardening characteristics take place.
>
> I can't say for a fact that the nitriding helps eliminate crank cracking
> since I know of at least one nitrided crank that broke, although the
> failure could have been partly attributed to another cause. It certainly
> helps with wear, and my nitrided camshaft shows no wear even after five
> years of use.
>
> The last crank I did was $150. PACK IT CAREFULLY. Insure it. UPS lost one
> of mine. ouch.
>
> Contact info:
>
> Advance Heat Treat Corp.
> 1625 Rose Street
> Monroe MI 48162
>
>
>
> phone 734-243-0063
>
>
> At 06:57 PM 11/4/02 -0500, SpiwakD@aol.com wrote:
> >Amicis
> > I have removed my stock crank to be turned and would like to do
> >whatever the latest is in hardening. It has been magnafluxed and
> >cryo-treated. What improvements can be done and where? A company in Ca is
> >doing "wedging" of TR cranks. Is this of use? My car is a TR3.
> > Dave
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