Penske Racing Shocks 8760 Series - Manual (Page 7)

7
8100 Series Compression Adjuster
The 8100 compression adjuster is located in the remote reservoir
assembly. The remote reservoir serves as an extension of the shock
absorbers vital elements: oil and nitrogen. The remote reservoir
theory allows for the use of increased volumes of oil and nitrogen
while allowing for smaller shock packaging. Increased nitrogen
volume is essential for consistent damping forces throughout a long
race and extreme conditions.
In the compression mode of the shock absorber, fluid is forced into
the remote reservoir in direct proportion to the area of the shaft
entering the shock body. As fluid enters the reservoir, it must pass
through the compression adjuster. Inside the compression adjuster is
the CD drum. The CD drum has (6) settings, numbered (1-6), with
number one setting (the largest hole) being full soft and number six
(the smallest hole) being full firm. As fluid is forced through the CD
drum (Figure 1), it is metered through one of the preassigned orifices
in the drum; it then enters the reservoir body,moving the floating
piston. The floating piston is designed to separate the fluid and
nitrogen, eliminating any chance of aeration.
In the event of high speed shaft velocities, fluid passing through the
hole in the CD drum could pack-up, causing an increase in damping
forces, due to the fact that fluid can no longer pass through the hole.
In this event, the fluid forces open the blow-off valve (Figure 2). The
blow-off valve makes a more linear damping curve.
Note: The remote compression adjuster is a fine tuning device for the
main valving located inside the shock absorber.
Figure 1
Figure 2