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RE: [evolution-disc.] Re: modifying OEM shocks

To: "'Rob Foley'" <RobertJFoley@compuserve.com>, <TeamZ06@aol.com>
Subject: RE: [evolution-disc.] Re: modifying OEM shocks
From: "Eric Salem" <eric@mail.brown911.com>
Date: Mon, 11 Mar 2002 21:18:55 -0600
Isn't the class called Stock?

How's this for a rule: If the OEM manufacturer no longer makes the part,
then and only then, can you use a non-OEM shock. 

Saves people money. Shortens the rule book. 

-----Original Message-----
From: owner-autox@autox.team.net [mailto:owner-autox@autox.team.net] On
Behalf Of Rob Foley
Sent: Monday, March 11, 2002 8:59 PM
To: INTERNET:TeamZ06@aol.com
Cc: Evolution Discussion; autox@autox.team.net
Subject: [evolution-disc.] Re: modifying OEM shocks


This is all 100% technically correct, and I can say that as a P.E. with
fluids and flow knowledge.  I'm staying away from the secret handshake
stuff at the end that I have deleted in the reply text re-post,  but
really, does anyone think that given the possibilities and potential
performance improvement, that someone out there wouldn't do something?
And just like everybody with a Z06 ran to get Koni 28's and Penskes,
there'd be a stampede on attempted tweaks like these in one manner or
another.  

Rob

Message text written by INTERNET:TeamZ06@aol.com
> 
As someone who works in the metal fab business, no hole drilling is
required. 
 You just put the shock body in a lathe and cut the shock open along the

original weld seam, then weld it up along the same seam.  Opening up any

shock can easily be made to look OEM by any halfway decent metal
fabricator.

Orifice flow can be greatly affected by whether the leading edge is
sharp or 
gently rounded.  Proving anything would be purely subjective.  Measuring
very 
small orifices will require controlled-temperature conditions and very 
exacting, calibrated measurement tools.

Heat treating and other methods can impact disc deflection, as can a
slight

tightening/loosening of the disc pack which would be hard to detect.  
Measuring slight variations in parobolic disc curvature is not easily 
obtained.

Internal gas pressure can be determined, but relative to what tolerance
spec? 
 How do we differentiate between intentional pressure reduction and
leaking

gas seals?

IMO a simple visual inspection alone will not be sufficient to detect
cheater 
shocks.  Trying to establish tolerances for mechanical measurement on
the 
wide variety of OEM applications is not within the realm of reality.  
Enforcement of OEM-only shock rules has already proven to be unworkable 
within our own club.  Why are people trying to lead us down a path that
our

club already knows will lead to a dead end?  

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