Larry asked me to forward this to the VR Digest as he wasn't able to.
Last year, someone directed me to the Comp Cams site & I have since had a
discussion with them confirming the zinc problem.
Norm Sippel
-----Original Message-----
From: lwdent [mailto:lwdent@wildblue.net]
Sent: Thursday, January 03, 2008 8:47 PM
To: twobees@sprynet.com
Cc: lwdent; Vintage Racing Digest
Subject: Re: [Vintage-race] What Oil Do You Use?
Here is the site for LN Engineering and their complete discussion on
why oils have changed and why conventional oils are no longer good
for our racing engines.
www.lnengineering.com/oil.html
Due to emissions needs the heavy metals have been removed, and these
are the components that give good cam break in and long cam life.
Why do you think that many of the major car mfg's have gone to roller
tappet cams in their new V8 engines. It ain't to save production
costs, it's to save warranty costs for wiped cam lobes. DUH!!!
Crane makes a break in additive that is necessary if you are going to
use conventional oil. It also aides cam break in and life with synth
oil. It can be obtained from Jeggs.
CompCam also has a very good paper in their web site concerning oils
and additives. Cam life is the real problem cause a lobe can be lost
in the first few minutes of operation of a new motor if the heavy
metals are not in the oil.
If you want to use oil, not synth, use Shell Rotella. It is a diesel
formulation and still has the right stuff. Lots of others do not.
Norm, I did a great deal of research on all this 6 months ago and
offered to do an article in your new mag about it but never heard
from you on the offer. HUM!!!
Your friend is living in the past. He is dead wrong!!!!! He will pay
for his ignorance with premature cam failures sometime. Perhaps not
this engine, but certainly one in the future.
This is not a case of "lets all pool our ignorance", as we so often
do. Crane Cams and CompCams, two of the MAJOR cam manufacturers,
both agree that there is a big potential problem with the latest
formulation of standard oils with the latest designation. I forget
what that is, but I knew when I offered to do the article.
Bottom line is, it ain't the oil thats going to kill your cam early
in life, it's the lack of proper additives, Zinc and Phosphorous.
CHOW
Larry Dent
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