What did you do with your 4runner today?

[emelianenkov]

My friend works as a structural welder. I'm not claiming anything but I know it's designed well.

Cbi has their shackle points welded to the face of the bumper, mine are TIG welded to the winch plate. It's strong

 

[aha2988]

My friend works as a structural welder. I'm not claiming anything but I know it's designed well.

Cbi has their shackle points welded to the face of the bumper, mine are TIG welded to the winch plate. It's strong

not trying to bust your balls here but it's not necessarily the manner in which the recovery points are welded on to the bumper; however, more so the manner in which the load forces are transferring back into the frame of the vehicle.

If you are only bolting to the factory bumper mounting flanges with the 4 bolts per side then you are not creating any stronger of a recovery point than the factory bumper bar would be with recovery points welded to that.

Also the factory frame rails are designed to crush similar to an accordion so if you arn't plate welding those back solid then you still have the same ramming effect as the factory bumper bar. (that goes for any aftermarket bumper though)

 

[c_mack9]

Dude. You should know better than to argue with an engineer. Just smile, nod, and walk away.

 

[ThePMFG]

Ordered an RCI steel front skid plate.

 

[emelianenkov]

Dude. You should know better than to argue with an engineer. Just smile, nod, and walk away.

Yeeeeeep.

 

[JB40]

This whole thing was over engineered and is STURDY! But that's how I prefer it, it makes me incredibly confident with my bumper. I know it'll stand the test of time, impact, and stress from winching/recovering.

You say it's over engineered? What type of engineer are you? And can you post up your stress/strain analysis and your testing process? I am curious as to the type of testing is done on these bumpers. Also would like to see the how/where frame stress transferred under flex versus the OEM bumper. If you have load information under winch load that would be beneficial too.

Eh. I'm no engineer but his claim of the bumper standing the test of time, impact, and stress from winching/recovery is probably accurate when compared to the factory bumper.

Much of your debate is focused on how much better it isn't for recovery and impact and you cite frame rail reinforcement,etc. That is assuming that the frame rail is the weakest link. I can tell you from experience that the bumper bends before the frame rails "crush similar to an accordion". Whether that is a good or bad thing is up to the owner to decide, but I'd rather have a bent bumper than frame rail, so I guess the benefit is in the eye of the beholder.

:hug:

 

[aha2988]

Eh. I'm no engineer but his claim of the bumper standing the test of time, impact, and stress from winching/recovery is probably accurate when compared to the factory bumper.

Much of your debate is focused on how much better it isn't for recovery and impact and you cite frame rail reinforcement,etc. That is assuming that the frame rail is the weakest link. I can tell you from experience that the bumper bends before the frame rails "crush similar to an accordion". Whether that is a good or bad thing is up to the owner to decide, but I'd rather have a bent bumper than frame rail, so I guess the benefit is in the eye of the beholder.

:hug:

well i was the one that cited frame rail reinforcements but you didn't quote me so i feel left out now..

The connection point between the bumper and the frame rails does become the weakest link in a recovery situation. your not going to pull 3/4" shackle mounts from the gusset welds on the face of a 3/16 plated bumper reinforced back to the bumper mounts, but you may.. just may pull the 11gauge plate that the bumper stud mounts are holding the bumper to welded on the end of each frame rail. This is why Shrockworks, ARB, as well as CBI create additional bolting locations for there bumpers that tie in further back on the frame.

And if the frame rail didn't need to be stiffened to handle harder impacts I doubt ARB would go to so much engineering trouble to create bolt on brackets that prevent the frame rails from crushing as easily during a front impact. You dont see many other fabricating companies offering this extra strength because it becomes a liability issue when you alter the functionality of a safety feature..

yes a steel plate constructed bumper is obviously stronger than the factory bumper bar that's not really a question here.

 

[momo.75]

....op2:

 

[emelianenkov]

What have I started... Oh dear god...

 

[AfroWookie]

Got these beauties delivered today. Shocks should be delivered soon and then I'll be impatiently waiting time off from work to do the install

 

[momo.75]

Got these beauties delivered today. Shocks should be delivered soon and then I'll be impatiently waiting time off from work to do the install

Woot!

 

[ebg18t]

My friend works as a structural welder. I'm not claiming anything but I know it's designed well.

Cbi has their shackle points welded to the face of the bumper, mine are TIG welded to the winch plate. It's strong

I believe in your post you claimed it was "over engineered". This would indicate it was "engineered". Engineers by nature use "data" to substantiate a claim of "over engineered".

Not actually analyzed but it's built stronger than cbi

Kind of a bold & broad claim. Any data other than a particular weld to substantiate?

 

[emelianenkov]

The materials it's made of and how it was built.

I've smashed into quite a few things already and haven't dented it yet.

Anyway, he builds bumpers and stuff for a living, so he knows what he's doing. I've been welding for 2 days. I'm pretty good at TIG welding because of my soldering experience

I'm not an engineer nor do I plan on being one. I don't find the joy in nit-picking minute details. Maybe I'm missing something here?

 

[ebg18t]

The materials it's made of and how it was built.

Can you post a link the ASTM E8 details for the material that you & CBI used? I am curious to see the difference.

 

[CC4R]

Cleaned up the headlights with the 3M headlight restoration kit from my work

 

[JB40]

well i was the one that cited frame rail reinforcements but you didn't quote me so i feel left out now..

Feeling better now?

Haha.

And true about mistaken identity. And your points are well made and understood. And I agree with whomevers assessment that the poster is just happy about his fabbed bumper, even if it doesn't have the "engineering" of an experienced supplier. Thanks for the clarification.

 

[momo.75]

Can you post a link the ASTM E8 details for the material that you & CBI used? I am curious to see the difference.

........eep:

 

[emelianenkov]

Can you post a link the ASTM E8 details for the material that you & CBI used? I am curious to see the difference.

I can throw around abbreviations as well.

I have no ****ing idea. Move on

 

[ebg18t]

I can throw around abbreviations as well.

I have no ****ing idea. Move on

It is the material strength sheet (most steel companys can supply it when you buy the material). We use it to help in determining which steel we spec in projects.

Bottom line: don't make claims about products unless you have information to support it. It comes off as if you discount/discredit those of us that have engineering backgrounds that are required to use 'facts' to make claims.

 

[emelianenkov]

I'm not trying to discount anyone, I'm just stating that it's built strong and differently than some commercial brands in ways that we feel are better than the others. I never claimed to be an engineer or anything else. That's just blowing shit out of proportion.

If the fabricator cared enough about proving on paper that the bumper is stronger instead of using real world results, he would pay for testing. I've used the bumper quite a bit with only positive things to say. I've hit trees and rocks on trails with no denting or deformation.

You don't always need a fancy overpriced piece of paper to know how to build something sturdy..