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INTRODUCTION
TECHNICAL
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With
OTHER rocker arm manufacturers, and especially with the most promoted
"shaft" rocker manufacturer, rockers have been "fit" to "heads." What's
the difference? The difference, is that Jim Miller has always, always,
always, since 1973 designed rocker arms to fit ENGINES! If you don't
have the accurate specs of the engine, having only the "head" means
nothing.
Today,
more sophisticated ways to develop designs are used, from the days when a Mutoh
draft table was the only way. But computers only speed the process. The above
"exploratory" drawing of the Chevrolet SB2-2, done from this basic layout, is
how all critical motion tangent points are determined from the perspectives Jim
has used for 25+ years. Mass and shape of the rocker bodies from this point on
is simple. Solid modeling follows in placing all components in an assembly. Mass
weight, moment of inertia, rocker side thrusts, lifter preloads and many other
critical facts are determined and modified long before any metal is ever cut.
But it all starts here, the old fashioned way, as it has for 30 years. The
ENTIRE engine. The heavily advertised "shaft" rocker arm company
designs rockers from ONLY measuring "heads." MEI designs for the entire valve train
of the
engine! The difference, is PUSHROD Geometry. We call this "Design
Geometry," and no other company knows more about this than MEI;
we developed it.
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MEI's "C6" for the
SB2-2 NASCAR. The simple, but highly detailed and precise 2-D CAD drawing (top)
is only the first step of many, flowing through a variety of software. From
"exploratory" to "production." CAD, Solid
Modeling (above), Kinetic Motion analysis, DNC/CAM manufacturing...all make the process
flow smoothly. But the fundamentals have never changed. The concepts of "Design
Geometry™" was founded on this simple
process, that became the foundation of MID-LIFT geometry: measuring the entire
engine's valve train from the cam to the valve.
Using the exact pushrod attack angles as they
operate with the valve.
Choose
the LINKS above that you need. Each choice gives you another option of choices
for each section of tech. The CYLINDER HEADS section, is fundamentals we use for
valve train design, that help us avoid the problems associated with choosing
valve lengths, pushrods, rocker studs and other parts which are routinely
selected at random. Hopefully these standards will help you avoid the same.

MILLER PRODUCTS GROUP
1777 Blount Rd. #501
Pompano Beach, FL 33069 USA
954-978-2171
MID-LIFT" & "PRO-SHAFT" are ® Registered Trademarks
of MILLER ENGINEERING INC; Copyright © MMIII - MMX JM Miller
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