Alignment Fundamentals Part One Suspension Systems Designed to

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Alignment Fundamentals Part One

Alignment Fundamentals Part One

Suspension Systems • Designed to: – provide satisfactory vehicle control – acceptable driver effort

Suspension Systems • Designed to: – provide satisfactory vehicle control – acceptable driver effort • Maintains directional stability: – – on various road surfaces all types of weather loaded and unloaded towing

Road Variables • Road Crown • Bumps & Pot Holes • Crosswinds & Cross

Road Variables • Road Crown • Bumps & Pot Holes • Crosswinds & Cross winds created by other vehicles • Road surfaces • Side forces • Drive axle forces • Suspension part movement

Rear Wheel Alignment & Vehicle Tracking • Thrust Line – Imaginary line @ 90

Rear Wheel Alignment & Vehicle Tracking • Thrust Line – Imaginary line @ 90 degree angle to the centerline of the rear wheels • Rear Wheel Offset – axle asm out of position, not parallel to centerline

Improper Thrust Angle

Improper Thrust Angle

Wheel Base • The distance between the center of the front & rear wheels

Wheel Base • The distance between the center of the front & rear wheels

Tracking • Position of the rear wheels in relationship to the front

Tracking • Position of the rear wheels in relationship to the front

Ride Height • The distance between the frame & the ground. If distance varied

Ride Height • The distance between the frame & the ground. If distance varied over ¼” between sides, handling can be affected.

Camber Fundamentals • Inward/outward tilt of wheel from true vertical. • Vehicle will pull

Camber Fundamentals • Inward/outward tilt of wheel from true vertical. • Vehicle will pull to side most positive. • Affects tire wear.

Camber Fundamentals Negative Camber Positive Camber

Camber Fundamentals Negative Camber Positive Camber

Jounce & Rebound • Jounce - Upward wheel movement • Rebound – Downward wheel

Jounce & Rebound • Jounce - Upward wheel movement • Rebound – Downward wheel movement

Caster Fundamentals • Tilt of a line that intersects the lower and upper ball

Caster Fundamentals • Tilt of a line that intersects the lower and upper ball joints (strut mount) in relation to true vertical

Caster Fundamentals

Caster Fundamentals

Positive Caster • Helps return to straight ahead position • Increases steering effort, the

Positive Caster • Helps return to straight ahead position • Increases steering effort, the wheels try to stay straight • Pos caster helps maintain directional stability • Too much affects steering, rapid wheel return • Pulls to side with the most pos caster.

Negative Caster • Decreases directional stability • Reduces steering effort

Negative Caster • Decreases directional stability • Reduces steering effort

Tire Wear • Caster has effect on tire wear

Tire Wear • Caster has effect on tire wear