Bump steer and other questions - Page 2 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Bump steer and other questions

Oconee Off-Road Now Offering Zone Off-Road Products!!!Warn and Smittybilt Free Shipping OfferRough Country Lift Kits and Parts!

Reply
Unread 07-11-2012, 08:06 AM   #16
Agony Wagon
Anti-Seizeaholic
 
Agony Wagon's Avatar
1995 XJ Cherokee 
 
Join Date: Aug 2008
Location: , Ohio
Posts: 1,621
What does it take to get them the same length? What else do I have to buy???

Agony Wagon is offline   Reply With Quote
Unread 07-11-2012, 08:59 AM   #17
foggybottombob
Registered User
1984 CJ7 
 
Join Date: May 2008
Location: Monument Colorado
Posts: 5,821
Don't worry about that. The effect of unequal length arms will be imperceptible from the picture you showed.
foggybottombob is offline   Reply With Quote
Unread 07-11-2012, 04:50 PM   #18
flying_bosun
Registered User
2006 LJ Wrangler 
 
Join Date: May 2009
Location: 34*24'N, 119*42'W, SoCal
Posts: 3,893
Quote:
Originally Posted by foggybottombob
I don't understand what any of this has to do with a plane as someone mentioned
Since everything else you said is nearly spot-on, I'll not muddy the waters, but will add this to clarify the "shared plane" concept. Notice in diagram 3 below the tb and dl are parallel, but not in the same plane (fore to aft) and not sharing a radial center, so their arcs of travel are not common and bumpsteer is inevitable. I hope it helps. Here's the link for the original thread: http://www.jeepforum.com/forum/f9/tr...tions-1356624/

Quote:
Originally Posted by flying_bosun

At issue specifically was the "parallel" relationship required to avoid bump steer.

We've all heard that the TB and DL must be parallel and it's been suggested that with a DPA this could be accomplished by raising the axle end of the TB or by dropping the TB frame end. Initially this seemed reasonable to me from a geometric stand-point, but upon further examination it turns out not to be the case; the problem is that our axles articulate.

Here are some rough diagrams that may help some to understand what I mean.

image-1665118114.jpg

image-3542679556.jpg

image-804048203.jpg

image-4060269015.jpg


For lack of a better explanation, bump steer occurs when the relative arcs' of travel don't share a (nearly) common center. This is because as the axle articulates, the push/pull forces acting on the axle via the track bar are at times contrary to the push/pull forces acting on the steering knuckle via the drag link.
__________________
[URL="http://www.grimmjeeper.com/gears.html"][COLOR="Red"][SIZE="3"]Gear-Calculator[/SIZE][/COLOR][/URL] [URL="http://www.stu-offroad.com/siteindex.asp"][COLOR="White"][SIZE="3"]Stu Can Help You[/SIZE][/COLOR][/URL] [URL="http://www.berrysprinter.com/jeepparts.php"][COLOR="Blue"][SIZE="3"]Part Names and Numbers[/SIZE][/COLOR][/URL] [URL="http://www.wholesalemopar.com/"][SIZE="3"][COLOR="Red"]Dealer Supplied Parts and ask for "Jeep Club" Prices[/COLOR][/SIZE][/URL]


[QUOTE=Ron Paul]“Liberty is lost through complacency and a subservient mindset. When we accept or even welcome automobile checkpoints, random searches, mandatory identification cards, and paramilitary police in our streets, we have lost a vital part of our American heritage. America was born of protest, revolution, and mistrust of government. Subservient societies neither maintain nor deserve freedom for long.”
― Ron Paul[/QUOTE]

[CENTER][SIZE="5"]"Did [I]you[/I] exchange your walk-on part in the war for a lead role in a cage?"[/SIZE][/CENTER]
flying_bosun is offline   Reply With Quote
Reply

Tags
bump steer , track bar
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.