Rear ICONS & mounts...

[justvettn]

I just remember someone had a shitfit because he posted it.

---------- Post added at 09:10 PM ---------- Previous post was at 08:57 PM ----------

The problem is happening with the Fox shox as well

 

[skyscraper]

Looks like these two examples were running 3.0's without bump stops... I wonder how much of a factor those play and would they have prevented torn mounts?

 

[vince7870]

Bigger shocks....more force! Again I believe a stronger bracket should developed as a replacement by someone or at very least get the duck plates offerred in a previous post

 

[Huck]

I believe the guy that had the issue with the fox's had one seize up. IIRC.

for the other ones that claim "weld failure" i bet if you looked at what was left on the truck the weld bead and some material next to it would be still on the truck and in tact.

Ill post up some stress analysis photos later today to show how much of a difference grinding makes.

 

[Goofball]

Looks like these two examples were running 3.0's without bump stops... I wonder how much of a factor those play and would they have prevented torn mounts?

Im with scraper on this one. Noticed that as well.

 

[Huck]

So here guys, Ran the analysis to show the difference between grinding and stock to show how much weaker the material gets.

So the following photos show stress in each component.

This is the stock bracket with 3500 lb of force on it. way more than the shock should ever transfer.

Green shows the fixtured reference, ie welded area. Purple shows the force direction.



Ignore color as being good or bad, i didnt take the time to set the scale for stress. blue is no stress, as it changes green is more stress, red is even more.

Here is what you had after your ground it.



As you can see, when you grind it the stress in the material goes up.

Here is a safety factor. Anything that has more stress then a safety factor of 2 turns red.

Stock
[URL=http://s1275.photobucket.com/user/Lukers_Ivaska/media/stock_sf_zps995e02d7.jpg.html][/URL]


Ground


As you can see, where your's broke is exactly where the analysis shows it gets weaker due to your grinding job.
@MTUH3 can confirm as well and so can Donk and YJ, we are all engineer's

 

[justvettn]

Most Rip right off at the welds weather they had grinding or not, his seems to be the exception so far and brock in the middle, which is better than ripping clean off.

 

[Huck]

Only ones that ripped with fully functioning shocks that have been reported on FRF are icons.

the guy with the fox had a whole shock sieze up, nothing you can do about that.
also icon's are the only ones that require grinding.

The fox bodies are clearanced for the bracket, and the kings have enough room.

 

[skyscraper]

Most Rip right off at the welds weather they had grinding or not, his seems to be the exception so far and brock in the middle, which is better than ripping clean off.

Show me a picture of where the welds failed. I'm curious to see those.

Huck: nice analysis. Any of us in the know knew why these failed just from the pics, but at least there's no question now, for those who are skeptical.

Remove material, remove strength.

 

[vince7870]

Pretty gnarly info there huck. Thanks.

Be curious to see if anyone with the new fox 3.0's adjustable rear shock stiffened up and take the same hit I did(very deep sharp pothole thT didn't even get into bumpstop travel) Ground or unground the force of the new bigger 3.0 shock stiffened up May also pop a stock mount due to forces unforeseen by stock shock engineering. My brain looks at stuff especially when a failure occurs and wonders how it could be improved or avoided. Maybe I missed my engineer calling in life. If were gonna play hard and there seems to be an issue with the icon mounted, a possible solution could be a stronger mount attached to a solid square bar. But as your trying to say I believe is the vehicle was designed for one thing and we've done something else so beware?

Point taken,,,,,now how do we make it better?

From my understanding the 3.0's your running with their accomodateing mounting point are soft in valving. Again I had my shocks stiffened up for road use and smacked a huge hole, I would probably never go offroadng on the setting the were on.

So here guys, Ran the analysis to show the difference between grinding and stock to show how much weaker the material gets.

So the following photos show stress in each component.

This is the stock bracket with 3500 lb of force on it. way more than the shock should ever transfer.

Green shows the fixtured reference, ie welded area. Purple shows the force direction.



Ignore color as being good or bad, i didnt take the time to set the scale for stress. blue is no stress, as it changes green is more stress, red is even more.

Here is what you had after your ground it.



As you can see, when you grind it the stress in the material goes up.

Here is a safety factor. Anything that has more stress then a safety factor of 2 turns red.

Stock
[URL=http://s1275.photobucket.com/user/Lukers_Ivaska/media/stock_sf_zps995e02d7.jpg.html][/URL]


Ground


As you can see, where your's broke is exactly where the analysis shows it gets weaker due to your grinding job.
@MTUH3 can confirm as well and so can Donk and YJ, we are all engineer's