Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the...
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Transcript of Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the...
![Page 1: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/1.jpg)
Alignment Fundamentals, Part Two
![Page 2: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/2.jpg)
Steering Axis Inclination (SAI)
• The inward tilt at the top of the strut.• (looking from the (looking from the
front)front)
![Page 3: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/3.jpg)
SAI and Included angle
• Include angle =
• SAI + pos. camber
![Page 4: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/4.jpg)
SAI and Bump steer
Zero SAI would =
Major bump steer
![Page 5: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/5.jpg)
0 Bump Steer
• SAI line meets tire vertical CL at road surface
• Tire wear reduced
• Steering effort decreased
• Less stress on components
![Page 6: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/6.jpg)
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
![Page 7: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/7.jpg)
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
![Page 8: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/8.jpg)
Pos. Scrub Radius
![Page 9: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/9.jpg)
Negative Scrub Radius
Commonly used on front wheel drive vehicles
![Page 10: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/10.jpg)
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
![Page 11: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/11.jpg)
Toe In & Out
![Page 12: Alignment Fundamentals, Part Two. Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front)(looking from the front)](https://reader030.fdocuments.net/reader030/viewer/2022032723/56649d095503460f949daa6c/html5/thumbnails/12.jpg)
Turning Radius & Toe-Out-On-Turns