alignment fundamentals part two
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Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI). The inward tilt at the top of the strut. (looking from the front). SAI and Included angle. Include angle = SAI + pos. camber. SAI and Bump steer. Zero SAI would = Major bump steer. 0 Bump Steer.

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Presentation Transcript
steering axis inclination sai
Steering Axis Inclination (SAI)
  • The inward tilt at the top of the strut.
  • (looking from the front)
sai and included angle
SAI and Included angle
  • Include angle =
  • SAI + pos. camber
sai and bump steer
SAI and Bump steer

Zero SAI would =

Major bump steer

0 bump steer
0 Bump Steer
  • SAI line meets tire vertical CL at road surface
  • Tire wear reduced
  • Steering effort decreased
  • Less stress on components
sai safety factors
SAI Safety Factors
  • Unequal causes serious handling problems
    • Torque steer
    • Pulling during braking
    • Bump steer
  • If SAI is out of spec
    • Camber will be out of spec
    • Bent or damaged components
scrub radius
Scrub Radius
  • Distance between SAI line & True Vertical CL of tire at road
  • Positive scrub radius – SAI line meets road inside CL of tire
  • Negative Scrub Radius – SAI line meets road outside CL of tire
negative scrub radius
Negative Scrub Radius

Commonly used on front wheel drive vehicles

slide10
Toe
  • The distance between the inside front edges and the inside rear edges of the tires
  • Wears tires with a feathered edge
  • Toe-out-on-turns – inside wheel at sharper angle that outside
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