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

Alignment Fundamentals, Part Two


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


Pos scrub radius

Pos. Scrub Radius


Negative scrub radius

Negative Scrub Radius

Commonly used on front wheel drive vehicles


Alignment fundamentals part two

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

Toe In & Out


Turning radius toe out on turns

Turning Radius & Toe-Out-On-Turns


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