Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: Norm on April 06, 2012, 01:45:14 PM

Title: Rear shocks position
Post by: Norm on April 06, 2012, 01:45:14 PM
Just fitting merc back axle to Xj and was wondering what the reason for fitting shocks one in front and one behind rear axle is ?  :017: Can I just mount them in the behind position with no detrimental effects ? Thanks.
Title: Re: Rear shocks position
Post by: wildwood on April 06, 2012, 02:18:13 PM
I can only think its a nod to some sort of axle wrap control..... But then they do it on TJs as well and they got no leaves to wrap.......
I'd go for it as I always thought it daft and that they should be in front of the axle :icon_super:
Title: Re: Rear shocks position
Post by: Nosebolt on April 06, 2012, 02:28:42 PM
double your chances of getting it right, fit twin shocks one pair in front and one pair behind  :icon_twisted:
Title: Re: Rear shocks position
Post by: Norm on April 06, 2012, 04:05:44 PM
Front it is then,thanks for the info  :icon_biggrin:
Title: Re: Rear shocks position
Post by: isle of man on April 06, 2012, 05:23:43 PM
I don't wish to contradict but it's normally the rear edge.

Why not mount it like the Toyota's pointing inbound - lots of flex that way? Just bouncing ideas.
Title: Re: Rear shocks position
Post by: Norm on April 06, 2012, 07:09:17 PM
I don't wish to contradict but it's normally the rear edge.

Why not mount it like the Toyota's pointing inbound - lots of flex that way? Just bouncing ideas.

Lol,very good. Now I'm confused,what would be the difference front versus back ? While I'm here and talking rear axle,would air be capable of holding dogs on diff lock that whas ment to be hydraulic ? It operates it fine,just not sure it would hold them when giving it a bit of pain ?   :icon_twisted:
Title: Re: Rear shocks position
Post by: isle of man on April 06, 2012, 07:15:58 PM
Just look at the ark and decide what is best for your application.
Title: Re: Rear shocks position
Post by: Dave69 on April 06, 2012, 09:38:37 PM
As long as you have a DAMPER at each end of the axle point vertical theres no point redesigning the ark. They are there only to stop axle patter driven from road bumps
Title: Re: Rear shocks position
Post by: willo on April 07, 2012, 11:34:13 PM
I don't wish to contradict but it's normally the rear edge.

Why not mount it like the Toyota's pointing inbound - lots of flex that way? Just bouncing ideas.

 :iagree:
Title: Re: Rear shocks position
Post by: Warthog on April 08, 2012, 12:11:47 AM
Just fitting merc back axle to Xj and was wondering what the reason for fitting shocks one in front and one behind rear axle is ?  :017: Can I just mount them in the behind position with no detrimental effects ? Thanks.

GEEK MODE ON:

They are actually aranged that way to help with twisting of the axle and in the event of tire spinning they will help to subdue some of the "tire hop" that may happen. In a properly set up rearend there shouldn't be any horizontal movement seeing as the axle is bolted to a specific spot on the springs. Also it helps to stop some twisting if one side of the axle hits a hole the the other doesn't. if they were both on one side the axel would tilt or "twist" and could possibly damage your universal joints and cause major problems.

To prevent axle hop especially on washboard surfaces. Leaf springs are prone to hop.
If the shocks are mounted on the same side of the axle the springs 'cycle' because of the mass of the axle and the road's impact at the same time at each tire.
There are two solutions:
Increase the shock's damping and the overall ride suffers or
Decrease the damping and install on opposing sides of the axle for a smoother ride.

GEEK MODE OFF:
Title: Re: Rear shocks position
Post by: Dave69 on April 08, 2012, 08:36:36 PM
(https://birtydastards.com/frm/proxy.php?request=http%3A%2F%2Fwww.fastcompany.com%2Fpics%2Fmultisite_files%2Fpics%2Fimagecache%2Fslideshowlarge%2Fslideshows%2Fkryten1.jpg&hash=cdf233bc7a61d61b302c54e0eaacc9e62de56f3f)
Title: Re: Rear shocks position
Post by: Lornaben on April 08, 2012, 09:19:45 PM
 :hysterical:
Title: Re: Rear shocks position
Post by: Warthog on April 08, 2012, 09:32:49 PM
(https://birtydastards.com/frm/proxy.php?request=http%3A%2F%2Fimg.photobucket.com%2Falbums%2Fv11%2FTenbulls%2FKryten-kryten-19990766-450-338.jpg&hash=14988d1a9e313e5264290b8ae69da76e1753c9f3)

 :003:
Title: Re: Rear shocks position
Post by: bigjeepzj on April 08, 2012, 10:26:17 PM
 :hysterical:
Title: Re: Rear shocks position
Post by: Dave69 on April 09, 2012, 09:17:23 AM
gave it serious thought about using that picture but it wasnt the appropriate choice