SignalAutoParts
.com

signalautoparts.com


alternator spacer fuel filter spacer shock absorber spacer starter spacer fuel pump


 


AdvanceAutoParts.com has everything you need to get your car back on the road and running smoothly!

Free Shipping on all orders over $25 at AdvanceAutoParts.com! No promo code required.

Advanced Auto Parts Homepage - Shop.AdvanceAutoParts.com


Understand your Car or Truck
Home
Automotive Terms
Caster
Ride Height
Steering Axis
Toe
Camber
Include Angle
Set Back
Turning
Electronic. sensors
Coolant Sensors
Smart Cars
Coil-plug Ignition
Crankshaft sensors
Knock Sensors
Air Temp. Sensors
Electronic Fuel Inj.
Thrust Angle
Brake Rotors
Gas Shocks
ABS System
Truck_SUV Tires
Steering Gears
Brake Pads Shoes
Power Steering
Wheel Bearings
Pistons
Automotive Bearings
Cylinder Bore Honing
Cylinder Heads
Engines
Bearing Life
Gasket Installation
Cams Chains Gears
Cylinder Head Ass.
ABS Diagnostics
Brake Fluid Life
Ceramic Brakes
Clutch Service
Head Lights
Oxygen Sensor
Rep. Brake Linings
Shock Absorbers
ABS Brakes
Season Checklist
Trailer Hitches
Trans. Fluid Leaks
Tail Lights
Air Suspension
Brake Disks
Braking System
Clutch Life
Air Filter
Oil Pressure
Rack pinion Steering
Rebuild OHC Heads
Comp. Engine Control
Elect. Circuits
Karman Air Sensor
ODB Terms
Diagnose Sensor Prob.
Bad Sensors

signalautoparts.com

STEERING AXIS INCLINATION (SAI)

The Steering Axis Inclination (SAI) angle, which used to be called the King Pin Inclination (KPI) angle, is an imaginary line that passes through the steering pivots. On an SLA or wishbone suspension, this would be a line between the upper and lower ball joints. On a MacPherson strut suspension, it would be a line between the lower ball joint and the top of the strut. On a truck suspension with king pins, it would run down the center of the king pin.

The SAI angle is specified in degrees, but specifications are not provided for some vehicles. SAI is used primarily as a diagnostic angle (see reference chart) to verify the angular relationship between the steering axis, wheel spindle and rest of the suspension. But it also affects steering. With MacPherson strut suspensions, SAI is moreSteering axis inclination - how much is too much! important than caster in determining steering wheel return. The inward slant of the steering axis lifts the car as the wheels turn. When the steering wheel is released, the weight of the vehicle helps to recenter the wheels.

SAI also reduces the need for excessive positive camber. SAI works with camber to maintain vehicle load toward the inner wheel bearing. This reduces steering feedback and harshness. MacPherson strut suspensions typically run a much higher SAI angle (12 to 18 degrees) than SLA suspensions (6 to 8 degrees) because a FWD suspension needs the extra leverage for directional stability and to counter torque steer. If the SAI angles are unequal side-to-side (even if static camber is within specifications), it can contribute to torque steer, brake pull during sudden stops and sometimes even bump steer.

Checking SAI when doing an alignment can tell you several things. It will tell you if the upper strut towers are located properly, if the lower control arms are bowed or if the center cross member has shifted. Comparing the SAI angle, the included angle and camber can help you identify bent parts. All too often the mistake is made of trying to adjust camber back to specs without determining why it is out of range in the first place. Page

    signal auto parts


  • HOME
Directory
Exclusive Parts Supplier

Copyright 2007 signalautoparts.com. All Rights Reserved.
Legal Use Of Site