PVC pipe bumper? - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 33 Old 08-07-2008, 11:17 AM Thread Starter
winkosmosis
Registered User
 
winkosmosis's Avatar
1999 XJ Cherokee 
 
Join Date: May 2006
Location: Maui, Hawaii
Posts: 3,279
PVC pipe bumper?

I was trying to think of ways to create a bumper that absorbs energy and is easy and cheap to replace. What about a bumper made of, say, 6" PVC pipe? You could use a straight steel pipe as a backing to bolt to the vehicle frame, then overlay it with foam, then cut out a section of the PVC and overlay it on the steel tube.

You could gain ground clearance over a stock bumper, and when you drag it over a rock or something, it will deform but won't dent. If it breaks, take a trip to Home Depot and spend a few bucks for a new bumper. You can't use it for recovery, but that is what hooks are for.

And if you get in an accident, it will absorb some energy, unlike a rigid steel bumper. Easier on your vehicle and the one that you crash into/ crashes into you.

What do you guys think?? Is it feasible?


Atheist Jeep Club member #3
Non-Astrologist Jeep Club member #?
Pull the Socialist Plug on Old People Jeep Club member #1
winkosmosis is offline  
Sponsored Links
Advertisement
 
post #2 of 33 Old 08-07-2008, 12:03 PM
rustywrangler
Got my eye on you.....
 
rustywrangler's Avatar
 
Join Date: Apr 2005
Location: Syracuse, NY
Posts: 18,614
Lawsuit waitin to happen after an accident.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Congenital Heart Disease is a reality for me, BOTH of my children have it. Please read up and become aware for future generations

Lydia Ann-Acquired 08/05/05 Open Heart surgery 08/10/05
Jacob Patrick-Acquired 01/17/08 Open Heart surgery 02/15/08
rustywrangler is offline  
post #3 of 33 Old 08-07-2008, 12:10 PM
Unlimited04
This post/info=my opinion
 
Unlimited04's Avatar
2004 LJ Wrangler 
 
Join Date: Dec 2005
Location: Colorado
Posts: 24,248
PVC will crush and explode under the impact you'd see in a crash. There would be shrapnel of plastic flying everywhere, probably going fast enough to break windows and/or become lodged in someone's flesh, put eyes out, etc.

actually steel is going to absorb energy A LOT better than PVC pipe would. The forces involved in an accident are tremendous... Force = Mass * Acceleration. Use 1/8th wall or 1/16th wall bumpers, they are much thinner than the frame and will bend under force. Thats why the stock bumper is so thin... Fill it with expanding foam insulation if you like. Its all about Elastic Modulus and Young's Modulus.

try steel bumpers with rubber stock absorbers on them, like delivery trucks have:
http://www.mcmaster.com/ctlg/DisplCt...av&ToolsetAct=


Useful Write-Ups:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Fabrication & Build:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Funny:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by Unlimited04; 08-07-2008 at 12:21 PM.
Unlimited04 is offline  
 
post #4 of 33 Old 08-07-2008, 12:45 PM
BESRK
GROUND POUNDER
 
BESRK's Avatar
1980 CJ5 
 
Join Date: Nov 2002
Location: Newport News, VA
Posts: 12,272
You could also line the front of the bumper with thick rubber. That would help for the slow speed "fender benders". You might want to browse around on Mcmaster Carr's site.. they have all sorts of plastic/rubber stuff.

Basically, if it's "cheap" and "effective", the manufacturers would've been doing it already.

'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BESRK is offline  
post #5 of 33 Old 08-07-2008, 02:20 PM Thread Starter
winkosmosis
Registered User
 
winkosmosis's Avatar
1999 XJ Cherokee 
 
Join Date: May 2006
Location: Maui, Hawaii
Posts: 3,279
The rubber pads are a good idea. Low profile bumper + thick rubber = win?

The steel bumpers though.. I've seen pictures posted after accidents, and people are proud of the bumper not taking damage. Then one guy posted a month later saying his frame cracked. It was after a Mustang hit him at 50mph but it looked like his XJ had no damage.

Which bumpers are thin enough to deform and absorb energy?

Atheist Jeep Club member #3
Non-Astrologist Jeep Club member #?
Pull the Socialist Plug on Old People Jeep Club member #1
winkosmosis is offline  
post #6 of 33 Old 08-07-2008, 02:57 PM
BESRK
GROUND POUNDER
 
BESRK's Avatar
1980 CJ5 
 
Join Date: Nov 2002
Location: Newport News, VA
Posts: 12,272
Quote:
Originally Posted by winkosmosis View Post

Which bumpers are thin enough to deform and absorb energy?
The stock ones...

'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BESRK is offline  
post #7 of 33 Old 08-07-2008, 03:36 PM
Unlimited04
This post/info=my opinion
 
Unlimited04's Avatar
2004 LJ Wrangler 
 
Join Date: Dec 2005
Location: Colorado
Posts: 24,248
Quote:
Originally Posted by winkosmosis View Post
Which bumpers are thin enough to deform and absorb energy?
this is what the stock bumpers are designed to do. notice the fronts have rubber bumpers, and the rears have a "crush zone" on a TJ. On XJ's they have "impact quality foam" front and rear with a plastic sleeve, just like almost every other vehicle made since the mid 80s.


Useful Write-Ups:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Fabrication & Build:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Funny:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Unlimited04 is offline  
post #8 of 33 Old 08-07-2008, 03:44 PM Thread Starter
winkosmosis
Registered User
 
winkosmosis's Avatar
1999 XJ Cherokee 
 
Join Date: May 2006
Location: Maui, Hawaii
Posts: 3,279
Quote:
Originally Posted by Unlimited04 View Post
this is what the stock bumpers are designed to do. notice the fronts have rubber bumpers, and the rears have a "crush zone" on a TJ. On XJ's they have "impact quality foam" front and rear with a plastic sleeve, just like almost every other vehicle made since the mid 80s.
I meant aftermarket steel bumpers.

How much energy can the stockers actually absorb though? They aren't required by federal regulation to absorb anything, because the XJ is classed as a light truck right?

Atheist Jeep Club member #3
Non-Astrologist Jeep Club member #?
Pull the Socialist Plug on Old People Jeep Club member #1
winkosmosis is offline  
post #9 of 33 Old 08-07-2008, 04:46 PM
Unlimited04
This post/info=my opinion
 
Unlimited04's Avatar
2004 LJ Wrangler 
 
Join Date: Dec 2005
Location: Colorado
Posts: 24,248
Quote:
Originally Posted by winkosmosis View Post
I meant aftermarket steel bumpers.

How much energy can the stockers actually absorb though? They aren't required by federal regulation to absorb anything, because the XJ is classed as a light truck right?
no. all bumpers on vehicles in the US are required to survive a 5mph impact into a concrete wall with no damage (aside from a scratched finish).

pretty much the entire point to aftermarket bumpers is beefing up the front or rear end for off-roading, they don't care about crash testing. however, some are crash tested to work with airbags, and the ARB front bumpers are only ones that are that I know of. think about it - hitting a tree, rock or resting on your bumper in a breakover angle situation would destroy a stock setup, or any setup ment to collapse, but beefy bumpers are designed to armor the vehicle from damage.


Useful Write-Ups:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Fabrication & Build:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Funny:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Unlimited04 is offline  
post #10 of 33 Old 08-07-2008, 05:05 PM Thread Starter
winkosmosis
Registered User
 
winkosmosis's Avatar
1999 XJ Cherokee 
 
Join Date: May 2006
Location: Maui, Hawaii
Posts: 3,279
Quote:
Originally Posted by Unlimited04 View Post
no. all bumpers on vehicles in the US are required to survive a 5mph impact into a concrete wall with no damage (aside from a scratched finish).

pretty much the entire point to aftermarket bumpers is beefing up the front or rear end for off-roading, they don't care about crash testing. however, some are crash tested to work with airbags, and the ARB front bumpers are only ones that are that I know of. think about it - hitting a tree, rock or resting on your bumper in a breakover angle situation would destroy a stock setup, or any setup ment to collapse, but beefy bumpers are designed to armor the vehicle from damage.
No, all vehicles aren't required to have 5mph bumpers. The regulation only applied to passenger cars, and they were required to hit an immovable object at 2.5mph. They consider that equivalent to hitting a parked moveable car at 5mph. NOW the regulation is 2.5mph, not 5mph. So that means hitting an immovable object at 1.25mph

http://www.nhtsa.dot.gov/Cars/Proble...per/Index.html

Quote:

49 CFR Part 581, "The bumper standard," prescribes performance requirements for passenger cars in low-speed front and rear collisions. It applies to front and rear bumpers on passenger cars to prevent the damage to the car body and safety related equipment at barrier impact speeds of 2 mph across the full width and 1 mph on the corners.
Quote:


No. The Federal bumper standard does not apply to vehicles other than passenger cars (i.e., sport utility vehicles (SUVs), minivans, or pickups trucks). The agency has chosen not to regulate bumper performance or elevation for these vehicle classes because of the potential compromise to the vehicle utility in operating on loading ramps and off road situations.
Quote:
The agency concluded that reducing the impact speed from 5 mph to 2 front and rear impact speed best satisfied the statutory criteria that the bumper standard "seek to obtain maximum feasible reduction in costs to the public and to the consumer." The agency also concluded that reducing the impact speed to 2 mph and eliminating the Phase II damage criteria would not have an adverse effect on safety as measured by the number of crashes, deaths or injuries that occur annually.
Ironically, I think PVC can easily meet the weak 1.25mph standard... Auto industry lobbyists "for the lose"

Atheist Jeep Club member #3
Non-Astrologist Jeep Club member #?
Pull the Socialist Plug on Old People Jeep Club member #1
winkosmosis is offline  
post #11 of 33 Old 08-07-2008, 06:36 PM
Matt Gertsch
www.lp.org
 
Matt Gertsch's Avatar
1999 XJ Cherokee 
 
Join Date: Jan 2005
Location: Nor Cal
Posts: 8,854
This is one of those things that I'll use my standard statement: feel free to kill yourself, but don't take others out in the process.

Derpy Hooves for President in 2012
Matt Gertsch is offline  
post #12 of 33 Old 08-07-2008, 07:24 PM
BESRK
GROUND POUNDER
 
BESRK's Avatar
1980 CJ5 
 
Join Date: Nov 2002
Location: Newport News, VA
Posts: 12,272
I'll take a stout bumper over a "crushable" bumper anyday of the week... I hit rocks alot more than I hit other vehicles.

At slow speeds, a crushable bumper on a Jeep might help some. A head-on into something at 60mph in a Jeep and I don't think it really matters what type of bumper you have.

My biggest fear (while driving my Jeep) is getting "T-Boned" in the side..

'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BESRK is offline  
post #13 of 33 Old 08-07-2008, 09:04 PM
Unlimited04
This post/info=my opinion
 
Unlimited04's Avatar
2004 LJ Wrangler 
 
Join Date: Dec 2005
Location: Colorado
Posts: 24,248
Quote:
Originally Posted by winkosmosis
They aren't required by federal regulation to absorb anything, because the XJ is classed as a light truck right?
you clearly know the answer already so why ask?

Quote:
Originally Posted by BESRK View Post
My biggest fear (while driving my Jeep) is getting "T-Boned" in the side..
ditto. thats where the cage and rockers come in handy


Useful Write-Ups:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Fabrication & Build:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Funny:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Unlimited04 is offline  
post #14 of 33 Old 08-07-2008, 09:17 PM Thread Starter
winkosmosis
Registered User
 
winkosmosis's Avatar
1999 XJ Cherokee 
 
Join Date: May 2006
Location: Maui, Hawaii
Posts: 3,279
Quote:
Originally Posted by Unlimited04 View Post
you clearly know the answer already so why ask?


ditto. thats where the cage and rockers come in handy
I don't know the answer. My license plate doesn't say Texas Truck on it. The feds could easily classify it as a car.

Atheist Jeep Club member #3
Non-Astrologist Jeep Club member #?
Pull the Socialist Plug on Old People Jeep Club member #1
winkosmosis is offline  
post #15 of 33 Old 08-10-2008, 11:20 PM
neatocj
Registered User
 
neatocj's Avatar
1981 CJ5 
 
Join Date: Jun 2008
Location: el paso, texas
Posts: 1,080
Heres my solution. Remove the whole front bumper and watch where you are going. PVC eh thats a big mess to clean up.

Your not pushing the limits of your jeep until your on your side, then something breaks and it's time to go home.
'70 Camaro - Almost Done
'81 Cj-5 - SOLD
'06 MegaCab Cummins- Great White
neatocj is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
run just a test pipe? 800dollarjeep Engines & Drivetrain 2 03-20-2012 06:56 PM
can you weld aluminum pipe to a stainless steel pipe? TXjeepTJ Fabrication Shop 16 03-05-2008 07:44 PM
Pipe Strength MeCasa Fabrication Shop 6 04-15-2006 08:27 PM
pipe bend this MyJeepisthebest Fabrication Shop 0 09-07-2005 02:47 PM
what size pipe T odd's J eep Fabrication Shop 3 02-09-2005 10:23 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome