Good machine shop work is hard to find. Shop around for price on the =
align bore and cam bearing=20
job, but get some references that you can check on as to the quality of =
the work. You don't, I am=20
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=20
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=20
proper size beads and with the correct air pressure, this gives a proper =
uniform surface finish with=20
no stress risers and should stress relieve the surface with out the =
detrimental work hardening.=20
-----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=20
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
>=20
> Hi All,
>=20
> I'm performing a sanity check:
>=20
> TR engine block - align boring for cam bearings...
>=20
> I got a price of $375 for the job.
>=20
> It sounds high... can anybody provide numbers that support this =
price???
>=20
> Oh, and I'm looking for someone to shot-peen some TR6 rods. Any =
pointers?
>=20
> C ya,
> rml
>
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> Bob Lang Room N42-140Q | This space for rent.
> Consultant MIT Computer Services |=09
> Voice: (617)253-7438 FAX: (617)258-9535 |
>
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