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Author Topic:   bending front steering arms
cozmiccowboy
Dirt Newbie

Total posts: 2
posted September 08, 2001 12:14 AM
Anyone heard of heating and bending the front steering arms? I heard of bending the rt (Passenger Side)one out towards the wheel and the left (drivers Side) one in towards the frame to get better ackerment. Anyone tried it? Any sucess with it?

awkwardjeff
Dirt Freak

Total posts: 224
posted September 10, 2001 10:24 AM
COZ, I bend the steering arms down 3/8 inch to correct the bump steer. This is the proper amount if you run stock lower ball joints, and stock tie-rods, in the stock location.
Bending the arms in or out is the WRONG way to correct ackerman. because as you turn one direction you create toe-out but as you counter steer you create toe-in, this makes the car very unstable on exit. Bend the steering arms down to correct bump-steer, running a different drag-link and tie-rods is the best way to correct ackermen.

This information can be used on any frame, but the measurements given are for the small metric frames.

c21
Dirt Full Roller

Total posts: 29
posted September 10, 2001 03:27 PM
Bending arms out is ok(don't bend either arm in). Shortening arms is a problem on dirt (creates toe-in during countersteer), but is considered OK on asphalt. Bend right (or right and left) steering arm(s) out 1/4" to 3/8". Bending arms to correct Bumpsteer issues is something I would only consider after exhausting all drag-link & idler/piman arm combo solutions.

awkwardjeff
Dirt Freak

Total posts: 224
posted October 03, 2001 10:54 AM
Just wondering why you think it's okay to bend the arms out but not in? I understand the pivot points and the timing issue of the points going over center in the arc of travle........I just don't understand why you wouldn't think bending them out would hurt the steering. But you believe bending them in does hurt.

Just your thoughts to help me understand if maybe I'm missing something........thanks


Jeff

c21
Dirt Full Roller

Total posts: 29
posted October 03, 2001 03:03 PM
Jeff, sounds like you may have given this topic more thought than I have.
My understanding of the dynamic relationship of front end components may be more primitive than yours.
First let me start by saying that I used to bend arms to modify ackerman, but found the gains (for me) did not justify the bother involved in making all of my spares the same. This is also why I do my bumpsteer correction with changing/relocating my draglink and tie rod assys exclusively.
But ... to answer your question .. I was under the impression that bending the steering arm(s) out (towards the tire)causes that wheel to turn out faster and in slower (relative to the other wheel), but other-wise doesn't "hurt" the steering and .. bending it in has exactly the opposite affect (taking out ackerman rather than adding it).
For anyone trying to follow this thread who would like a picture of what I am talking about: Imagine a straight line drawn from the inner tie rod mounting point on the drag link to the lower ball joint. Now imagine the outer tie rod hole in the steering arm, the farther that hole is from the imaginary line you drew the less steering (on that wheel only)you get for a given amount of draglink motion. So .. by bending the arm out you effectively shorten it when the wheel turns out and lengthen it when the wheel turns in. I hope that makes sense.
If this doesn't answer your question, or if it creates more (or if you think my grasp is only half-baked) please let me know.
c21

[This message has been edited by c21 (edited October 03, 2001).]

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