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RE: Align Boring for Cam Bearings

To: "'DLDEAD@worldnet.att.net'" <DLDEAD@worldnet.att.net>,
Subject: RE: Align Boring for Cam Bearings
From: Gernot Vonhoegen <gernot.vonhoegen@stir.ac.uk>
Date: Mon, 16 Nov 1998 11:55:48 -0000
Absolutely, I normaly hate "me too answers" but this one is really a case
where you have to agree.

> ----------
> From:         SOLOW GREG[SMTP:gregmogdoc@surfnetusa.com]
> Reply To:     SOLOW GREG
> Sent:         Saturday, November 14, 1998 10:16 AM
> To:   'DLDEAD@worldnet.att.net'; Bob Lang; triumphs@autox.team.net
> Cc:   fot@autox.team.net
> Subject:      RE: Align Boring for Cam Bearings
> 
> 
> Good machine shop work is hard to find.  Shop around for price on the
> align bore and cam bearing 
> job, but get some references that you can check on as to the quality of
> the work.  You don't, I am 
> sure want to end up with a ruined block.  As to shot peening, I certainly
> don't recommend doing that to any standard English con rods.  When we were
> racing a Lotus Super 7 in the early 70's, the only rods that ever came up
> not passing magnaflux inspection were shot peened .  On two occasions when
> a crank broke and bent two rods each time into pretzels, the rods still
> passed a mag inspection  after the blow up. These rods had not been shot
> peened.   I would much rather have a rod bend than have it break.  My
> theory ( and I am certainly open to better information) is that standard
> English rods are in an "as forged" condition, which is pretty soft.  Shot
> penning work hardens the surface of the rod.  Under 
> high rpm inertia loads the rod wants to stretch, the inside metal is not
> hard enough to resist the load and stretches.  The outside that has been
> shot peened is very hard and will not stretch, so it cracks.  If the rods
> were heat treated to the proper overall hardness before the shot peening,
> then they would probably come out strong and tough as we would like them
> to be.  I like to smooth all of the irregularities from the surfaces of
> the rods and then GLASS PEEN them. If done with the 
> proper size beads and with the correct air pressure, this gives a proper
> uniform surface finish with 
> no stress risers and should stress relieve the surface with out the
> detrimental work hardening. 
> 
> 
> -----Original Message-----
> From: DAN DURYEE [SMTP:DLDEAD@worldnet.att.net]
> Sent: Friday, November 13, 1998 9:51 PM
> To:   Bob Lang; triumphs@autox.team.net
> Cc:   fot@autox.team.net
> Subject:      Re: Align Boring for Cam Bearings
> 
> Hi Bob,  I had a cam seize in the block several yrs. ago. in the GT-6. I
> got
> cam bearing from Ken (BFE)  and had them installed here in Denver, cost
> was around $250. Most any good engine builder should have a shot -peener.
> Dan 
> SDS Racing
> 
> ----------
> > From: Bob Lang <LANG@ISIS.MIT.EDU>
> > To: triumphs@autox.team.net
> > Cc: fot@autox.team.net
> > Subject: Align Boring for Cam Bearings
> > Date: Friday, November 13, 1998 10:02 AM
> > 
> > Hi All,
> > 
> > I'm performing a sanity check:
> > 
> > TR engine block - align boring for cam bearings...
> > 
> > I got a price of $375 for the job.
> > 
> > It sounds high... can anybody provide numbers that support this price???
> > 
> > Oh, and I'm looking for someone to shot-peen some TR6 rods. Any
> pointers?
> > 
> > C ya,
> > rml
> >
> --------------------------------------------------------------------------
> --
> ---
> > Bob Lang            Room N42-140Q          | This space for rent.
> > Consultant          MIT Computer Services  |        
> > Voice: (617)253-7438        FAX: (617)258-9535     |
> >
> --------------------------------------------------------------------------
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