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Auto 160 > Auto 160 Midterm Review > Flashcards

Auto 160 Midterm Review Flashcards

1
Q

What is Torque Steer?

A

Front wheel drive car pulls to one side when you accelerate hard… i.e.give it the beans.
CV axles can be different lengths (one shorter than the other) so because the longer axle is more flexible and the shorter axle is stiffer when you give it the beans the long flexible side is trying to catch up to the short stiffer side.

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2
Q

Geometric Centerline

A

Viewed from above the geometric centerline is an imaginary line that is drawn from the center of the rear axle to the center of the front axle.

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3
Q

What is the first priority of the Chassis and Suspension?

A

Stability and Control

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4
Q

Thrust Line

A

The direction the rear wheels steer the Car.

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5
Q

Left Thrust angle vs Right Thrust angle, which one is +/-

A

Left is Negative (Towards Drivers Side)
Right is Positive (Towards Passenger Side)

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6
Q

Thrust Angle

A

The angle formed by comparing the chassis Geometric Center Line to the rear wheel Thrust Line.

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7
Q

Centerline Steering

A

Level of the steering wheel position when car is going straight.

A non-centered steering wheel is an indication of a possible thrust angle problem.

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8
Q

Another word for Geometric Centerline Adjustment?

A

Two Wheel Alignment

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9
Q

What is a “Thrust Condition”? AKA “Dog Tracking”

A

When the front wheels steer into the direction of the thrust line.

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10
Q

What is a Thrust Line Adjustment?

A

When adjusting the directions of the front wheels to be parallel with the thrust line of the rear wheels. AKA Two wheel alignment.

Important: If rear wheels or axle aren’t lined up right then that should be dealt with first.

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11
Q

If I had a bad tie rod end and I came to a sudden stop what would likely happen to my steering?

A

It would give and cause the steering to pull towards the side with the bad tie rod end.

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12
Q

How do you test a “Pull” to see whether the issue is coming from the brakes or the suspension?

A

Get the car going to about 30-40mph then lightly press on the brakes, if it pulls then it is most likely a brakes problem. If it doesn’t pull then, at 30-40mph this time slamming on the brakes, if the car pulls then it is most likely a suspension issue.

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13
Q

What is the order that you do a 4 wheel alignment?

A

Rear Camber
Rear Toe

Front Caster
Front Camber
Front Toe

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14
Q

Vehicle pulls left and you have excessive wear on the outside edge of the front drivers side tire?

A

Camber too positive on that tire.
Camber always pulls towards the tire side with the most positive camber.

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15
Q

Excessive wear on the inside and outside edge of a rear passenger tire?

A

Underinflation of that tire.
When you have wear on both shoulders of the tire its likely due to under inflation. If its worn just in the middle of the tire then it is over inflation.

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16
Q

Excessive wear on the outside edge of the front passenger side tire and the tread is feathered?

A

Toe.

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17
Q

What does excessive wear on the front passenger side tire and the tread is scalloped or cupped indicate?

A

It is out of balance. Wheel balance.

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18
Q

If you have a coil spring mounted on the lower control arm what does that mean the lower control arm ball joint is the?

A

The load carrier

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19
Q

If you have a steering wheel shimmy at 48 mph, not before and not too much after what do you need to do?

A

A wheel balance.
The tire is laterally (Horizontal) out of balance, radial (Vertical) imbalance would cause the wheel tramping (bouncing).

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20
Q

What is the load carrier on a McPherson strut?

A

Upper bearing plate

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21
Q

What is a tires bead made out of?

A

high-tensile steel cable

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22
Q

On radial tires do the beads run across the tire?

A

No, the plies run across the tire from bead to bead.

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23
Q

P 205 / 75 R 15

A

Tire Type (P Passenger, C Commercial, MS Mud & Snow aka All Season)
Section Width (Millimeters)
Aspect Ratio (Section Height divided by Section Width)
Construction Type (R Radial, B Bias Belted, Diagonal (Bias))
Rim Diameter (Inches)

24
Q

What is the wear indicator on some ball joints?

A

The zirc fitting, once you cant see the hex that you put the wrench on anymore then it’s sunk into the ball joint indicating the part is worn out.

25
Q

Does camber change when the vehicle travels over a bump?

A

Obviously

26
Q

When one wheel on the front axle is further behind the other what is it called?

A

Setback.
On the rear axle when one wheel is further behind the other it’s not considered a set back.

27
Q

Do torsion bar suspensions still use control arms?

A

Yes

28
Q

What is the load carrier on a McPherson strut assembly?

A

Bearing Plate

29
Q

What is the load carrier on short long arm suspension If the Spring is mounted on the upper control arm?

A

The upper control arm ball joint is the load carrier and the lower ball joint is the follower.

30
Q

What is the load carrier on short long arm suspension if the spring is mounted between the two control arms?

A

The lower control arm ball joint is the load carrier and the upper is the follower.

31
Q

Is Caster a high or low tire wear angle?

A

Very Low
Unless you constantly are going into a lot of turns (Palomar Mountain).

32
Q

What are the two things you have to do before an alignment?

A

Tire Pressure
Ride Height

33
Q

What tire angle should always be even with each other?

A

Toe

34
Q

What tire angle can be unequal to each other to compensate for road crown?

A

Camber or Caster

35
Q

Ratio between the width of the tire and the height of the tire is called?

A

Aspect Ratio

36
Q

UTQG

A

Uniform Tire Quality Grade

37
Q

UTQG rates what three things?

A

Temperature
Traction
Tread Wear

38
Q

What does the mph rating on a tire look like?

A

A letter code… not number

39
Q

Where do aftermarket wheels center?

A

On the Lug studs.
Lug-centric vs Hub-centric.

40
Q

What is the largest hole you can repair on a tire?

A

1/4 inch

41
Q

What is likely the cause of tire vibration?

A

An imbalance, lateral runout or radial. Or just tire runout.

42
Q

Static vs Dynamic is aka…

A

Still vs Moving

43
Q

27 Tech A: 2 Psi of underinflation will result in a decrease in tire wear. Tech B: Tire Rotation will Reduce tire wear.

Who’s right?

A

Both Wrong.

44
Q

Does tire rotation reduce tire wear?

A

No, tire rotation assures that tires are worn evenly not that tire wear is reduced.

45
Q

For this question what is the extra load carrying shock?

A

The air shock.
They have load levelers that are coil overs but just for this question…

46
Q

Active suspension vs Adaptive suspension?

A

Active suspension is active all the time it is reacting to all of the conditions of the road.

Adaptive only reacts to extra loads in the vehicle. Doesn’t necessarily mean that it reacts to all of the road conditions.

47
Q

What suspension assembly can get you back your ride height?

A

Torsion bars.

48
Q

Which type of suspension uses double acting hydraulic cylinders instead of shock absorbers? Active or adaptive?

A

Active Suspension
You can actually change a tire without using a jack…

49
Q

When working on suspension it think… where do you place the jack if the lower ball joint is the load carrier, under the Control Arm or under the frame?

A

Under the Control Arm.

50
Q

If the upper control arm ball joint is the load carrier then where do you place the jack when working on the suspension (I think)?

A

Under the frame.

51
Q

Four ways a ball joint can be attached to the control arm?

A

Bolted
Riveted
Threaded
Pressed

52
Q

Should you get an alignment every time you do any major suspension work?

A

Yes, like ball joints and upper control arm bushings. THat sort of thing…

53
Q

Is SAI and toe out on turns (Ackerman angle) angles adjustable?

A

No, only Caster, Camber, and Toe can be adjusted. Camber and caster sometimes need a kit to adjust.

54
Q

Why do front wheel drive cars use negative scrubb radius?

A

Incase of a blowout, the car wont pull out darting to the side of the blowout.

55
Q

What is the angle you are correcting for when doing a four-wheel alignment?

A

Your correcting for the thrust angle.

Auto 160 (6 decks)

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