Author Topic: 5 link rear sandcar suspension  (Read 2756 times)

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Offline BrianN

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Re: 5 link rear sandcar suspension
« Reply #105 on: August 11, 2018, 07:20:36 PM »
Not a perfect triangle. If I would have known the L shape with two links on bottom was stronger, I would have done that. Would have been easier, but I assumed a triangle would be better. With that said, the single link in front of the axle is closer to the bottom. I considered the same idea with the box that you mentioned, but I am going for a different look and idea. Hey, it may fail. Pics are what I did today. Forward links, shock mount, plates, and more gussets yet to come.




Offline dsrace

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Re: 5 link rear sandcar suspension
« Reply #106 on: August 12, 2018, 08:49:43 AM »
looks good!  i personally would lay some 1" to 2" stitch welds on the inside from tube to plate but that's just me.  the bottom of the tires ( front and rear) always see more load than the uppers. your 2 forward link need to be strong as these keep the carrier from rotating not only from driving force but from the load of the shock on the carrier. shock placement over the center of the axle stub is always best but not always obtainable.  what you have built may be strong enough, but, i would probably use 3/4" chromolly heims on that lower link to be safe. i used 5/8" chromolly heims on my 6 link and 5 link builds ( heavy v6 rail especially) but at one point in time i used the standard standard steel on steel heims and they didn't last long. so i strongly suggest lined chromolly heims. do not  and i repeat do not, use aluminum rods on the forward links!!!!!! i have personal experience why we don't!  ;D ;D so save yourself the trouble and take my advice on this one!  the tube and plate idea does look better than a flat square plate btw, but the square plate is, imo , stronger and simpler. now i am not saying that to discourage your idea and build, just saying is all and if you stitch weld the inside i bet yours holds up just fine. if that's all chromolly then my concern would be brittle fractures around the welds unless you anneal it as a whole then heat treat it to an appropriate rockwell rating. honestly i am not even sure you would need to harden it and that would be a question best answered by fabr or fastcorvairs.
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Offline dsrace

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Re: 5 link rear sandcar suspension
« Reply #107 on: August 12, 2018, 09:02:52 AM »
here's why forward links need to be steel not aluminum lol    ;D ;D ;) ;) back in 2008 first and only time i thought i would try them on a heavy rail. works great on light weight bike powered but no so good on heavy rails  ;D















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Online fabr

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Re: 5 link rear sandcar suspension
« Reply #108 on: August 12, 2018, 09:19:21 AM »
I would have it annealed since I saw posted some of it is from 4140 also. If it were all from 4130 and the welds were allowed to air cool slowly in still air  I would just run them but if it does have some 4140 I would recommend annealing the whole thing. 4140 will through harden whereas 4130 will not if welded with argon shielding as should be.

As far as the single bottom link as opposed to double, I would not have done that. Maybe it will be OK but we know for sure double bottom links are best. Your work looks good though. Carry on.

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Offline BrianN

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Re: 5 link rear sandcar suspension
« Reply #109 on: August 12, 2018, 05:06:05 PM »
It is double bottom link. And the parts are far from finished.