Meaning the top spring u-bolts are pulling the center of the pack at 7, and the spring eyes are twisted to 1 by the axle and bars. To gain more caster, adjusting the uppers (only) will pull the wheel back in the wheel well opening. Camber. To use the tool, you first adjust the pegs to suit your wheel diameter. On early Mustangs, for example, Ford employed a strut rod attached to the lower control arm that can be moved either in or out to adjust the caster. What is important is moving the tire the same number of degrees in and out. Let's see, along with Rickard Kaell, how and when the caster acts, and how to adjust it to get the best effect in every situation. The usual spec is slight toe-in to compensate for angular pressure that forces each tire outward as the car rolls down the road. Most bubble gauges are equipped with a magnetic adapter that allows you to place the gauge on the brake hub. Look down at your feet and point your toes inward with your heels angled outward. The camber adjustment of your wheels is an important measurement to keep an eye on. Now,for adjusting the caster angle several methods are available. Most vehicles have positive caster because it provides greater feel and stability, helps the wheels track straight, and provides steering wheel return after turning. Keep in mind that you're using the same shims to adjust caster as you are to adjust camber. Some teams use one edge of the bubble so that reading the angle is more accurate than trying to estimate the center of the bubble. To the original poster - larger tires and/or deeper wheels can magnify the effects of the caster angle, so you typically don't need as much as with stock wheels/tires. See: Installing camber adjusting upper ball joint sleeves Personally, we prefer the shim, it … For more information about ASE, visit the official ASE website at www.ase.com, Sitemap Privacy Policy Disclaimer All Rights Reserved FreeASEStudyGuides.com ©Copyright 2020. This will be especially important the next time you're stranded on a lost Pacific island and the cannibals offer to crown you king if you can dial in the right caster and camber on their Pro Bamboo car. It is the angle between the pivot line (in a car an imaginary line that runs through the center of the upper ball joint to the center of the lower ball joint) and vertical. If this pivot angle is leaning toward the back of the truck it is positive caster, and, of course, if the angle is rotated toward the front of the truck, it is negative caster. Adjusting the camber angle on a vehicle affects the total toe. This is an extreme example of positive caster that creates high-speed stability-the effect that allows the rider to let go of the handlebars while the bike tracks straight. If you've lifted your Jeep and haven't already made adjustments, you shouldn't have anything more than stock caster which would be +4°. Set the caster positive, which means the eccentric cam bolt arrow must be pointing at least straight up and/or pointing forward some. Now turn the tire 20 degrees out and the gauge will read the amount of positive or negative caster. If you are lucky enough to own several cars, you could easily recoup the typical $50.00 alignment charge in only three jobs. We'll cover the basics and get into how to set your own alignment at home with a few simple tools that any good car crafter should have in his toolbox. They run a large amount of positive caster to make the cart track straight without wandering. Are you accounting for the angle of the ground you are on? The caster angle or castor angle is the angular displacement of the steering axis from the vertical axis of a steered wheel in a car, motorcycle, bicycle, other vehicle or a vessel, measured in the longitudinal direction. First of all you have to measure the caster of your vehicle.Several caster gage are available in market. The control arms, top and bottom yellow parts, are usually adjusted by cam bolts or eccentric-washer bolts to effect camber and caster changes. Positive caster is when the lower axis is toward the front of the vehicle, and the upper pivot is leaning away from the front toward the rear. Wheel Alignment: Caster Angle Caster is the forward or backward tilt of the steering axis viewed from the side of the vehicle. If you've just finished a front suspension upgrade with new springs, for example, the ride height will change once the springs settle. More likely than not, a tad less. Using the center caster adjustment knob underneath the gauge, zero the caster reading. Replace the damper pinch bolts with the adjusting bolts (A), and adjust the camber angle. Placing extra … An example of caster in action is the front wheels on a shopping cart. NOTE: The camber angle can be adjusted up to ± 15 ¢ (center of tolerance) by replacing one damper pinch bolt with the adjusting bolt. 3-4 degrees should do you fine. Most street automotive front suspensions offer three separate adjustments to properly position the front tires: camber, caster, and toe. I've done alignments back in school but not a jeep mostly big rigs. We also used a set of aluminum toe plates from Intercomp to measure toe. Check and adjust toe after adjusting the camber or caster angle. Refer to the above recommendations for how much caster … If you don't have a set of turn plates you can use the angles machined on the corners of the gauge as a reference. The Alternative Rocker - Taurus SHO V6-powered, Explorer-framed, TTB-front, RCV'd, YJ … We've also included typical specs for a single-purpose drag car. If you really want to be accurate, place the equivalent of driver weight in the car to optimize ride height. Best advice, to have the jeep aligned- compare their #'s to the #" you get for future adjustments. Toe-out is the worse of the two angles, since a car with excessive toe-out will have skittish steering, often darting to either side of the road very easily. The camber of the vehicle determines how much the wheels are tilted either inside or out. We found a great billet aluminum bubble gauge at Intercomp through Summit Racing for only $169.95, which sounded reasonable. Caster is a little less obvious. There are several methods to adjust camber, depending on the vehicle and its suspension. We've experimented in the past with digital angle finders, which work very well but require math to calculate caster angle. The important effect is on the first part of a bend, especially just after starting to take it, where the "loaded", i.e. Attached to the aluminum angle is a bubble level with an adjusting knob. Conversely, if the tops of the tires are tilted outward, that's positive camber. An interesting point is that the 20-degree turn-in and turn-out figure is not critical. Caster is the forward or backward tilt of the steering axis viewed from the side of the vehicle. You can add or remove shims from the rear bolt or where the upper control arm attaches to the hub. Vehicles with SLA suspensions use the upper and lower ball joints to create the angle, and those with struts use the center of the upper strut mount and the lower ball joint as the angle. This will kill the measurement if they aren't. A safe starting point for caster is 2 to 3 degrees of positive caster. It is this same torque that requires more effort to turn the wheel. Turn the wheels until the angle is parallel to the side of … It might take 50 to 100 miles for the springs to establish a consistent ride height. Now turn the tire 20 degrees out and the gauge will read … Of course, you could also make many of these tools (such as the toe plates) yourself to save a little money if your budget is ultratight. You may need to adjust the Heim Joints by turning one in or out more than the other to get the appropriate setting. That alone is worth the price of admission. If you were to simply install a coil spacer for a few easy inches of lift, your caster angle would be on the low side of its acceptable range which will have a negative impact on straight line handling. After adjusting all three settings, take the car out for a leisurely testdrive and pay attention to how it reacts to different pavement and driving situations. What Tools Will You Need?Like any other job, the better the tools, the more accurate the result. Using the center caster adjustment knob underneath the gauge, zero the caster reading. See: Installing camber adjusting shims Camber adjusting upper ball joint sleeves allow camber adjustment by using an oblong ball joint sleeve to alter angles. Front-End Alignment SpecsSince this story is not aimed at a specific vehicle, we'll fling you a set of generic alignment specs that will work for most '60s street-driven vehicles. I sacrifice caster to get proper camber. Camber is easy to visualize. See Adjusting Jeep CJ Caster. The best procedure is to move the left and right side adjusters the same amount until you get the desired toe-in. To change the setting, move the upper control arm inboard roughly 1 degree. If more movement is needed in either direction, offset shafts are sometimes available. This excessive positive caster will cause a shimmy at higher speeds and excessive steering wheel snapback. Cars equipped with an upper control arm are generally mounted with a cross-shaft. The opposite, toe-out, is where the leading edges of the front tires are angled outward. We learned that every time you adjust the toe (without turn plates), you must push the car backward and then forward roughly 10 feet. Big rigs use caster shims on the front axle. More realistically, what if you want to test your car at the dragstrip after a suspension rebuild, but the alignment shop can only fit you in a week from Wednesday? When we did our first home alignment, this was where we screwed up. Next. Virtually all vehicles employ positive caster, but excessive amounts can lead to camber problems, since these two angles directly affect each other. The opposite situation is negative caster, where the top of the spindle is tilted forward past its vertical centerline. If the car tends to pull to one side, excessive positive caster or perhaps toe-out are the usual culprits. Most domestic cars use left- and righthand threads with a threaded sleeve and locking nuts to prevent the adjustment from changing. 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