Vehicle & Technical > Suzuki

Calmini Death Wobble!!!!!!

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Boggert:
Steve,
Do you think it could be a problem with the leaf springs?

DaveHenderson:
interesting stuff, and your right i don’t understand how but the diffs are pointing slightly downwards. :lol:
Are these wedges hard to fit/adjust correctly?
 :D  :D
thanks

rollazuki:
The contact point of the tyre will always be in the same place, in a vertical line exactly below the axle centre. this never changes, biger/smaller tyres, rotating the axle etc. the contact patch is exactly that, the point where the tyre touches the road.
draw a line thru the king pins (imagine a line thru the king pins, or the axis where the steering turns), and this projects down and forewards to a point on the road in front of the tyre. The distance between this and the tyres contact patch is the TRAIL.
Effectivley this is a triangle with the base being the measured trail, the height being the vertical line from road to axle centre, and the hypotenuse being the lind drawn thru the kingpins.

By fitting a larger tyre, you increase the height of the triangle, increasing the length of the base, and hence the trail.

by rotating the axle casing you change the angle of the hypotenuse, also increasing/decreasing the length of the base and hence the trail.

Thus by rotating the axle casing we can alter the amount of trail the steering sees on the road.

A tiny amount of trail will result in a damned vague steering feel, with little or no self centering, wandering around with no 'centre point' feel.

An excess of trail will give an over correcting effect, causing the steering to self centre like hell, and to flap around like a mad thing when in motion.

A happy medium has to be reached........

on a link suspension, you can adjust mounting points or link lengths, on a leaf, the easiest way is to place wedged shims between axle and spring pack.

Ill try to make some sketches(haha)

rollazuki:
See pics from bottom to top, lower pic showing steering basics, next one up showing change in trail due to an increase in wheel/tyre combo, top one showing change in trail due to rotation of axle/diff assbly

Rolla(not an artist!)

V8MoneyPit:

--- Quote from: "DaveHenderson" ---interesting stuff, and your right i don’t understand how but the diffs are pointing slightly downwards. :lol:
Are these wedges hard to fit/adjust correctly?
 :D  :D
thanks
--- End quote ---


I believe the wedges come in different 'angles'. The simply fit between the axle bracket and the spring. At worst, you might need replacement U bolts if yours snap undoing them.


--- Quote from: "Boggert" ---Steve,
Do you think it could be a problem with the leaf springs?
--- End quote ---


Hard to think of a problem with the springs that could cause this effect. I have to agree with our resident artist and chief picture drawer  :lol: It's a geometry issue. It is a matter of playing with the angles until it works. Hopefully, changing the castor to achieve different trail won't give unpleasant side effects.

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