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SAI stands for steering axis inclination. It is the angle from the upper ball joint/or upper strut to the lower ball joint. If this "line" is off, it can be an indication that there is a bent steering or suspension part. this is in simple terms, a front end shop can give a deeper explanation and example.
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What makes steering wheel come back to center?
The alignment angle called caster helps with steering wheel return.
What are the wheel alignment specs for a 1961 impala?
Front Toe: 3/16" +/- 1/16" Front Camber: 1/2° +/- 1/2° Front Caster: 0° +/- 1/2° SAI: 7-1/4° +/- 1/2° Turning Angle: 20°/18° +/- 1°
Does a front wheel drive car need back wheel alignment?
If it is out of specification the rear, yes. If it is in specification, no. Makes sense, doesn't it! Some cars have adjustable alignment angles in the rear, and do indeed call for a four-wheel alignment. On many cars, there are no rear adjustments, but the front wheels should be aligned with respect to the rear, what is properly called a thrust-angle alignment. Unfortunately, many shops are not careful with their terminology and use the term "four-wheel alignment" when they really mean "thrust-angle alignment." Even so, they usually correctly distinguish between cars that have alignable rear ends and those that don't, and price the job accordingly. As to whether your car has an alignable rear end, you'll need to refer to a shop manual to find out.
Does the 2000 Chrysler lhs front wheel drive require a 2-wheel alignment or 4-wheel alignment?
Four wheel is preferred.
What is the difference between wheel alignment and wheel balancing?
wheel balancing is to balance four wheels. wheel alignment is to straight four wheels.
Does a wheel alignment machine needs to be calibrated?
Yes, wheel alignment machines do need to be calibrated.
What exactly does a wheel alignment do for a car?
A wheel alignment is what syncs your steering wheel with your wheels. It ensures your car will drive straight when your steering wheel isn't turned.
When do you need front alignment vs 4 wheel alignment?
if you have independent suspention front and rear chances are a 4 wheel alignment can be done typically front wheel drive vehicles but not all.
Which technician would be used for an used car wheel alignment?
An alignment tech.An alignment tech.
Should you balance your tires before or after an alignment?
Before-a bad alignment cannot "unbalance" a wheel, but an unbalanced wheel, if bad enough, can throw off an alignment.
What is an aligner?
Alignment: alignment is positioning of the steered wheels to achieve directional stability during straight ahead position, perfect rolling condition on steering and recovery after completing the turn. Basic factors or angles involved in an alignment are suspension height, caster, camber, toe-in, toe-out, Steering axis inclination (SAI) and turning radius. It is also referred as a wheel alignment.There are three more factors which are affect alignment are thrust angel, scrub radius, set back.All these factors affect steering effort, ride quality, steering stability and tire wear.Here are the indications that car may need an alignmentUneven or improper tire tread wear.Your car pulls or drifts to one side.Your steering wheel does not return easily after a turn (Poor returnability).Excessive play in steering.When you go for wheel alignment of your car it consists of adjusting the angle of your wheels so that they are perpendicular to the ground and parallel to each other or to the manufacturer's specification. Proper wheel alignment reduces tire wear, improves fuel economy and handling. So you need to do the wheel alignment every 7000-10,000 miles.In regular wheel alignment adjustment of toe-in and toe-out is required.In case of any accident or any major case it is required to do full wheel alignment which consists of adjustment of all angles.
Can a two wheel alignment be done on a 1999 town and country after a tie rod replacement or does it need to have a four wheel alignment?
A two wheel can be done, but a four wheel is preferred.
