Alignment fundamentals part two
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Alignment Fundamentals, Part Two PowerPoint PPT Presentation


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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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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

  • SAI line meets tire vertical CL at road surface

  • Tire wear reduced

  • Steering effort decreased

  • Less stress on components


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

  • 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


Pos. Scrub Radius


Negative Scrub Radius

Commonly used on front wheel drive vehicles


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


Toe In & Out


Turning Radius & Toe-Out-On-Turns


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