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Old 11-20-2003, 08:23 PM
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bump steer

Hello, I came across a term I'd never heard before."bump steer". I've got an Austin A40 2door that I'm building as a 60s gasser/street.I've got a straight axle for it and came across this term.Sounds like something I should be aware of.What is it?what does it do?Do all straight axle systems do this?

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Old 11-20-2003, 09:13 PM
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Bump steer is the tendancy to change directions when hitting such things as expansion joints in the pavement or just bumps and uneven pavement. Real bad examples will almost change lanes on you, mild bump is just anoying. Drag link type steering setups are very prone to bump steer, cross link steering systems are less likely to bump steer.
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Old 11-21-2003, 12:08 PM
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Thanks BOBCRMAN
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Old 11-21-2003, 09:53 PM
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You won't run into bumpsteer with a straight axle!! I happens on independent when the steering linkage isn't lined up with the lower control arms. On a rack unit or linkage(idler arm) the inner tie rod pivot has to be at the same swing as the lower control arm pivot and parallel to the lower arm. Otherwise to toe in changes on bumps and the car darts side to side.
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Old 11-23-2003, 03:01 PM
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Thanks snkbyt, That's interesting!
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