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  #1  
Old 04-23-2018, 02:47 PM
KarTek's Avatar
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Shock Absorber Question for You Jeanius' Out There

Folks,

I was wondering, out of curiosity, do regular shocks have any internal bump stops in the compression and rebound direction?

Most vehicles I've seen, have compression bump stops on the frame and the shock seems to be what stops the suspension from extending beyond a certain point.

This is shocks only, not struts.

Thanks!

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Old 04-23-2018, 03:35 PM
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Shocks have specs on compression and extension limits. Go beyond that and start hurting the shock. The geometry of the suspension movement limits usually prevents this.
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Old 04-25-2018, 12:03 PM
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So, letting the shock internals be the stop on compression is definitely a bad idea.

Isn't the shock limiting extension a fairly normal practice since the shock is actually retarding the movement as well?
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  #4  
Old 04-25-2018, 05:50 PM
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First off the max force in extension is weight at 1 G. Second most springs limit extension. A lot of custom stuff ( think lifted 4WD trucks) employs limit straps.
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Old 05-10-2018, 12:42 AM
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First off, 1G is acceleration, not force. The force exerted is the unsprung mass * G, plus the spring rate * length of compression. The downward acceleration of the wheel and hub can actually be greater than 1G, because the spring adds to the total force applied to the assembly. But the downward force is resisted by the viscosity of the shock fluid flowing through the valve, so it's probably much less than 1G in any specific example.

All the Mercedes suspensions I've ever owned are limited by the struts, not the springs. On bump, the external bump stop prevents the strut from bottoming and crushing the valve. On rebound, there's an internal mechanism (mechanical or hydraulic, depending on design) which snubs downward travel. The rubber mounts also help cushion both bump & rebound.

Shocks would be the same, except the snubbing mechanisms for bump can be internal.
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Old 05-10-2018, 04:51 PM
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Quote:
Originally Posted by Mxfrank View Post
First off, 1G is acceleration, not force. The force exerted is the unsprung mass * G, plus the spring rate * length of compression. The downward acceleration of the wheel and hub can actually be greater than 1G, because the spring adds to the total force applied to the assembly. But the downward force is resisted by the viscosity of the shock fluid flowing through the valve, so it's probably much less than 1G in any specific example.

All the Mercedes suspensions I've ever owned are limited by the struts, not the springs. On bump, the external bump stop prevents the strut from bottoming and crushing the valve. On rebound, there's an internal mechanism (mechanical or hydraulic, depending on design) which snubs downward travel. The rubber mounts also help cushion both bump & rebound.

Shocks would be the same, except the snubbing mechanisms for bump can be internal.
You might want revisit science.

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