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Old 09-03-2004, 09:11 AM   #1
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Default Making shock absorbers

Does it actually make a difference if the shock piston doesn't extend back to its original length when you press down on it.

Does it mean that it won't function properly if it doesn't.
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Old 09-03-2004, 09:59 AM   #2
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Its called rebound when the shock pushes back out when compressed. It doesn't matter if you have rebound or not, just make sure that its the same from left to right.
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Old 09-03-2004, 10:09 AM   #3
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If you have air in the shock it will rebound and it should not do this.

The little rubber element compensates for the increase in volume due to the shock shaft entering the chamber.

There is air on the other side of the element and this should be allowed to escape so i usually drill a small hole in the top of the shock mount for this

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Old 09-03-2004, 10:14 AM   #4
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I always thought that shock abosbers needed to rebound. Well, my mistake, thanks for the tip.

If that is the case when do you know when you need to reconstruct the shock, ie changing the shock oil.
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Old 09-03-2004, 10:19 AM   #5
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some of them leak after a while so need redress once in a while. I do mine about every 4-5 races.

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Old 09-03-2004, 10:26 AM   #6
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Quote:
Originally posted by ziggy12345
If you have air in the shock it will rebound and it should not do this.

The little rubber element compensates for the increase in volume due to the shock shaft entering the chamber.

There is air on the other side of the element and this should be allowed to escape so i usually drill a small hole in the top of the shock mount for this

Cheers
I have to disagree with you on the air causing the rebound. It seems to be caused by building the shock with pressure in it. If you fill the shock to the very top, set the bladder on top lightly and screw on the top, you will get a lot of rebound. Thats because more oil is getting trapped under the bladder. If you press the bladder down allowing the excess oil to escape before screwing the top on, you will get very little rebound. I have done it both ways and I have checked for air and found none.
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Old 09-03-2004, 09:33 PM   #7
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Quote:
Originally posted by Rapid Roy
I have to disagree with you on the air causing the rebound. It seems to be caused by building the shock with pressure in it. If you fill the shock to the very top, set the bladder on top lightly and screw on the top, you will get a lot of rebound. Thats because more oil is getting trapped under the bladder. If you press the bladder down allowing the excess oil to escape before screwing the top on, you will get very little rebound. I have done it both ways and I have checked for air and found none.
You are correct. You want to make sure that there is no air in the shock and there is no rebound. The less rebound the better. With good quality shocks like the ones I use I have only a couple of mm of rebound on each shock. The shock is meant to dampen not provide force. That is what the springs are for.
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