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Author Topic: Omegas and Camber:- Explanation  (Read 8378 times)

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wheels-inmotion

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Omegas and Camber:- Explanation
« on: 06 January 2008, 11:11:18 »

Camber is the vertical position of the wheel..

It's duty is to maintain the position of the cars weight at about mid-point of the tyre footprint.

The force generated by the camber is conically compressive... This is achieved by deforming the circumference of the tyre sidewall, forcing both front tyres to roll into the cars centre line.

But there is a problem?
The suggested position for the front camber is 1 degree 40' negative (top of wheel leaning toward the car)

Over time the front coil springs will weaken lowering the cars sprung area... This not only changes the camber position it also changes the dynamic camber gains... So a calculated gain from -1 degree 40' on the bump to 2 degrees 10' is exceeded.... maybe to 2 degrees 50'.

A dynamic average per mile maybe 2 degrees 30'.

So what you say!
Most Japanese manufacturers offer a progressive calibration table that allows the operator to measure the actual body height and categorize the changes required to compensate for the new dynamic positions, historically this means less static camber.

Unfortunately this table is not available for the Omega... So if you have worn coils and tyre wear the shop will set the camber to the OEM 1 degree 40' negative.... Thus the problem returns and the forum chatter will offer other criminals like wishbones and alike.

Whats the difference?
Camber tyre wear involves about 10% of the total tyre width.... It's very violent wear and can reduce a new tyre to the wire in 5k.

Wishbone wear allows tyre contact rolling resistance to change the toe position... The tyre wear is lateral and involves the entire tread...Additionally on the bump and under braking the car usually pulls.

What to do?
Geometry positions are not absolute law... In fact it borders the theoretical on most cars even with progressive tables. wheels-inmotion (wim) wrote new calibration positions for the Omega some years ago.... I think you would understand it's commercial suicide to display the actual settings but if you are having problems we are willing to help with data out of sight (email-pm)

Further reading
www.wheels-inmotion.co.uk
www.wheels-inmotion.co.uk/forum

I hope this topic is of value to some members
Tony@ wim

 







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