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Old 04-19-2004, 11:28 PM
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Question 126 "leans" the tires into turn;does the 124?

126 chassis "leans" the tires into the turn ( all kind of benefits)
Does the 124 chassis lean the tires into the turnthe same way?

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Old 04-20-2004, 02:51 AM
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High postive caster yields a negative camber gain curve on the outside front tire in a corner. This helps compensate for body role and keep the tire closer to vertical with the ground while cornering.

This high caster front end geometry is a design feature of the 124, 126, and 201 models. A little bit of static negative camber - say up to one degree - helps, too.

Duke
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Old 04-20-2004, 08:16 AM
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Positive castor almost universal

About the only mass produced cars I know of which were designed with negative castor were the big Buicks of the early '60s, and all of us old codgers know how badly they handled (unless you belong to the Ralph Nader school of thought: that good handling consists of the tendency of a car to continue in a straight line, no matter what). When I converted my first series Mustang to GT-350 alignment specs for autocrosses, besides lowering the chassis mount point of the upper A-arm by an inch, I went from 1/2 degree positive to 4 degrees positive castor, along with a little negative camber, and it sure helped turn-in and front end grip, but it made the non power steering car a bear to park.
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Old 04-20-2004, 02:39 PM
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you will notice that the inside tire has a higher camber change than the outer one - this is because the inner tire is turned at a larger angle than the outer one (Ackerman steering), resulting in more camber change for the inner wheel.

the main purpose of the camber change is to maintain the tire contact patch at an optimal level as the vehicle rolls when negotiating a curve, and as the tire sidewall flexes from the lateral forces.

another effect of positive caster is a self-centering characteristic, which contributes to high-speed stability.

however, it also makes the car prone to "tramlining", as the front tires encounter longitudinal ruts and grooves on the road, which becomes more pronounced with wide, low profile front tires.

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