Actually, he's quite correct. I have two solutions for that--a ready-to-go
set of standard rockers and a set of replacement tips for the rollers. The
tips are fixed inserts that duplicate the ends of the stock rockers. The
benefit then becomes simply having aluminum rockers with needle bearings
instead of bushings. I'm going to run them past the HMSA tech guys and see
what they say. At worst, it's a 30 minute job to replace the rocker assembly
and readjust the valve lash for any organization that won't allow them.
Truth of the matter is, I don't expect any performance increase at all--my
cam is staying the same. Just a reliability improvement.
Bill Babcock
Babcock & Jenkins
_____
From: Group44TR7@aol.com [mailto:Group44TR7@aol.com]
Sent: Thursday, January 13, 2005 11:49 AM
To: Bill Babcock
Subject: Re: TR4 rocker ratio
Bill
I was told recently by an engine builder that most vintage groups do not
allow the use of roller rockers. Since I know that you race with one of the
ones that has the stringest requirments about alot of other aspects of the
car, it sounds like her incorrectly advised me. Its getting so you just
don't know who to believe.
Cary
In a message dated 1/13/2005 10:57:59 AM Pacific Standard Time,
BillB@bnj.com writes:
It might seem like I'm overly focused on this issue, but I'm getting ready
to add roller rockers to Peyote, so I'm studying up on how to get the
geometry just right. I did finally find somewhat of a reference. In Rick
Voegelin's book on engine blueprinting he says the theoretical ratio
differs from the actual due to manufacturing tolerances, the deflections in
the drivetrain, and the complex motion of the rocker as it sweeps across the
valve stem. Sounds right that it's all three of those things.
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