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Old 09-01-2011, 07:51 AM
build a bridge & get over it
 

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wheel alignement specs

hi all i have a 66 belair i am running 2156515 radials on the front i cannot get the wheel alignement right, i have power steering i have about 2 deg pos caster, about 1 1/2 deg pos camber & 1.5 mm pos toe setting, i have tried camber in pos & neg not much different when i do a u turn i can feel the tyres biteing into the road any help would be appreciated, cheers tim

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Old 09-01-2011, 08:20 AM
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You're likely seeing an Ackerman steering problem where the wheels turn in a different arc from each other. If it's a stock steering setup you likely can't do much with it. If it's aftermarket, you should research it and see if there's adjustments to be made to correct it. Camber specs closer to 0 is where I'd start as for specs, otherwise the alignment isn't the issue.

Note: Changing the wheelbase also changes the Ackerman center.
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Old 09-01-2011, 08:35 AM
build a bridge & get over it
 

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all the steering is stock, have tried camber at or near o deg with not much difference, am baffeld as to what is going on, by the way i have replaced the entire front end to try & solve this problem.
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Old 09-01-2011, 10:34 AM
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Brian Martin,Freelance adviser
 
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With that little caster the tires "bite" as they turn (the higher the caster the less rolling resistance as they bite less when turned). The wider tires only make it worse. Increase the caster and that should lessen the symptom.

Brian
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Old 09-01-2011, 11:54 AM
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Considering positive caster causes a "lean" when turning the tires, I'd say just the opposite was true. Either way, though, depending on the severity of the problem, I don't know if caster has enough range to make it any different.
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Old 09-01-2011, 12:06 PM
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Think about it, what do speed record cars run, a LOT of caster, like 18 degrees! The tire may lean more but that is just it, it is leaning over providing less "bite" on the tread. If it has negative caster the tires leading edge is being pushed down onto the surface of the road to MAKE it want to pull the car in the direction it is being turned.

High end "autobaun" cars have much more caster because they are made to go at high speeds. A more handling canyon carver has lower caster because it is made to cut corners.

Brian
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