4 link anti squat - 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
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 10-16-2008, 03:21 AM
Registered User
 
Join Date: Oct 2008
Location: UK
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
4 link anti squat

Hi all,

I am new on here but I have a question relating to anti squat on a 4 link live axle car. I understand the theory of having the arms converge etc to induce some anti squat and therefore improve traction under acceleration but I have a general question.

Is it better to have the convergence point close to the ground and further forward or higher and further back? I have done some calculations for my car and the figures turn out higher are with the convergence point further forward and lower to the ground. However, my concerns relate to the fact that to achieve this, the lower arms need to point downwards to the chassis which in theory will induce squat. Is this correct or am I wrong?

Perhaps my calculation method is wrong but I used one that I found on here

%Anti Squat = 100 / (IC Height / IC length from rear axle centre line) / (Cof G height / overall wheel base length)

Is this correct?


Many thanks

John

    Advertisement

Last edited by John Loudon; 10-16-2008 at 05:15 AM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-16-2008, 03:58 AM
Registered User
 
Join Date: Oct 2008
Location: Colorado
Posts: 22
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
4-link

In chassis engineering handbook, under 4 link without a pan hard bar, the top links are horizontal to the ground, with the bottom ones angled upward and pointing inward to a convergent at about the output area of the transmission. Both show the same length.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-16-2008, 06:51 PM
Member
 
Last wiki edit: Vacuum brake bleeder set up
Join Date: Nov 2003
Location: So Cal
Posts: 1,245
Wiki Edits: 8

Thanks: 0
Thanked 0 Times in 0 Posts
When you screw with stuff like that there are a bunch of extra things you need to think about.

Here is a little spreadsheet that I (with help from some others) put together to work out some of the numbers.
http://mysite.verizon.net/triaged/fi...rLinkV3.1d.zip

If the convergence point (aka IC or Instant Center) is too close to the rear wheels you can get brake hop problems. Milliken & Milliken say shorter than 60" is too short.

The more you angle the links up (lower on axle and higher on chassis) the more roll oversteer you get. Some roll understeer would be better.

Play with it, do some research, see where stuff fits, and build it
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-17-2008, 01:48 AM
Registered User
 
Join Date: Oct 2008
Location: UK
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks all. I will play with the figures

John
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 10-17-2008, 06:11 PM
Registered User
 
Last photo:
Join Date: Jun 2008
Location: USA
Posts: 1,172
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
Member Billy Shope on this site is a chassis engineer and has a website dedicated to your question, and much more. Explained in simple language.

Check with billyshope on this site, and here is a link to his website.
http://home.earthlink.net/~whshope/
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 10-18-2008, 07:00 AM
Registered User
 
Join Date: Oct 2008
Location: UK
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks - I have been in touch with Billy who has proved invaluable as has his website utilities.

John
Reply With Quote Quick reply to this message

Recent Suspension - Brakes - Steering posts with photos

Quick Reply
Message:
Options

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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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
89 dodge dakota anti lock and brake light on notmrgoodwrench Suspension - Brakes - Steering 14 06-05-2006 08:41 PM
Project Journal link not showing up 78novaman Hotrodders Site Suggestions and Help 11 07-23-2005 09:06 AM
Jon-Smilies link 5.0Towncar Hotrodders Site Suggestions and Help 5 03-03-2003 10:33 PM
4 link vs. triangulated 4 link. rear suspension bentwings Suspension - Brakes - Steering 4 11-23-2002 12:44 PM


All times are GMT -6. The time now is 03:16 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.