| [GMCnet] Rear shock calibration [message #110768] |
Tue, 04 January 2011 08:06  |
Gary Casey
Messages: 448
Registered: September 2009
Karma:
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Senior Member |
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The shock absorber calibration on most cars is such that there is much more
damping on rebound than on compression, or "jounce." The purpose is to reduce
the shock transmission to the body when hitting a bump, but still controlling
the body motion. So it turns out that stiff damping on rebound is less
disturbing to the occupants than on jounce. Many shocks are "90/10" or 9 times
the force one rebound as on jounce. Race cars often have 50/50 calibration
because they don't care if the driver complains about the ride. Most shock
valve systems have a combination of check and relief valves to accomplish this.
Question: The rear shocks on the GMC work the opposite of car shocks in that
jounce extends the shock instead of compressing it. Do the manufacturers
reverse the valving to increase rebound damping or do they ignore the difference
and just build a standard shock? I suspect the latter, but I have no idea.
Gary Casey
'73 23' with Bilstein shocks
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