Sway bar cold or warm bend? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Suspension - Brakes - Steering
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 10-03-2008, 11:00 AM
staleg's Avatar
Registered User

Last journal entry: Hand brake
Last photo:
Join Date: Dec 2005
Location: Norway - Europe
Age: 50
Posts: 918
Wiki Edits: 0

Thanks: 3
Thanked 15 Times in 13 Posts
Sway bar cold or warm bend?

Yes, I know this have been discussed in earlier post. I just want to share my practical, newly earned experience...
Today I was going to fit a wrecking yard sway bar to my hot rod. The sway bar was from a Volvo 240 series, solid steel, 19,5 mm in diameter and app 2,5" too narrow, so I wanted to stretch out the bends on each side with app 1,75". Not very much, in other words.

I've always thought cold bending would be the best to be sure the metal not would change.

At my job we have a manual operated hydraulic press I used. I bent a little at the time, to ensure I didn't bent it too much. First side went well. On the other side the bar suddenly snapped off!

A "bang" and there it was in two pieces, 19mm straight off!

Luckily i had welding glows on (I held on one of the ends while I bent it) and the pieces didn't fly around. And I don't think there was any loose, small fragments either.
Why did this happen? Was the sway bar forged? And if so, does that mean I just can get another one and warm bend it instead?

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 10-03-2008, 01:11 PM
powerrodsmike's Avatar
Hotrodders.com Moderator
Last wiki edit: Make a fiberglass fan shroud
Last journal entry: Next.. ..Bagging the king B (barge)
Last photo:
Join Date: Jan 2005
Location: gilroy, california
Age: 56
Posts: 4,104
Wiki Edits: 161

Thanks: 0
Thanked 3 Times in 3 Posts
At the point where it broke, was there evidence of a crack that had already been there?

Rust and dirt stains partway into the mating surfaces of the section that broke apart is the giveaway.

Forged parts usually have what looks like a mold parting line, but thicker.

Although I read the previous discussion, it seems like unless there was a previous crack, that swaybar might have been hardened in some way.

Volvo does things differently than most other car manufacturers...I mean that in a good way.

Later, mikey
my signature lines...not really directed at anyone in particular..

BE different....ACT normal.

No one is completely useless..They can always be used as a bad example
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-03-2008, 02:18 PM
staleg's Avatar
Registered User

Last journal entry: Hand brake
Last photo:
Join Date: Dec 2005
Location: Norway - Europe
Age: 50
Posts: 918
Wiki Edits: 0

Thanks: 3
Thanked 15 Times in 13 Posts
Unfortunately I left the broken piece at work, but I will take a photo and post it on monday. The brekage surface looked very clean. No rust, traces of previous cracks or "dirty sports" in the metal etc.

Since I'm working in a chain factory, there are people at my job with good knowlegde in steel types, hardening, etc. I will discuss it with them.
I will also check this out on the Swedish hot rod discussion board. Maybe some of them have used Volvo sway bars (Swedish hotrodders use lots of other Volvo parts) and know what's the correct way (or if there are a correct way) to bend them.

After all I'm glad the thing snapped off. The other arm, that I bent first and that did not snap off, is probably weakened, since I must have been very close to the brakiong point when I bent that one too.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-06-2008, 10:41 PM
aosborn's Avatar
Registered User
Last wiki edit: Suspension: designs, shapes, sizes Last photo:
Join Date: Oct 2008
Location: Lakewood, WA
Posts: 621
Wiki Edits: 7

Thanks: 0
Thanked 18 Times in 17 Posts
re: Sway bar cold or warm bend?

Sway bars or anti-roll bars are indeed heat treated. They are very typically made of the same material and are heat treated like coil springs. They have to be heat treated to obtain the characteristics to perform the function they were designed for.
Reply With Quote Quick reply to this message

Recent Suspension - Brakes - Steering posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sway bar ? buford 8 Suspension - Brakes - Steering 2 03-04-2007 05:25 AM
Sway bar dimensions? staleg Suspension - Brakes - Steering 6 02-26-2007 11:26 AM
Sway Bar bushing blues bowtyebob Suspension - Brakes - Steering 6 11-27-2006 05:58 AM
rear sway bar DeathByGreaser Transmission - Rearend 2 02-07-2003 02:25 PM
Sway Bar Installation...do it. F-1Rodder Suspension - Brakes - Steering 3 09-19-2002 03:01 PM

All times are GMT -6. The time now is 04:52 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.