Turbocharged Air Systems Flashcards

1
Q

What is the basic reason for turbo charging and engine?

A

To increase the power output

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2
Q

The increased air pressure created by a turbo also tends to increase what?

A

the turbulence created in the cylinders

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3
Q

The compression ratio in a turbo charged engine is?

A

Lowered

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4
Q

What happens to injection timing in a turbo charged engine?

A

Timing is retarded

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5
Q

A turbo charged engine designed correctly can have a power output increase of?

A

50% or more

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6
Q

A turbocharger is often referred to as?

A

A centrifugal air pump

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7
Q

The major components of the turbo are?

A

Turbine wheel and housing

Compressor wheel and housing

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8
Q

Turbo’s can reach what speed?

A

Over 100,000 RPM

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9
Q

Another name for the compressor wheel is?

A

Impeller

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10
Q

The turbo shaft assembly spins on what type of bearing?

A

Full floating bearing

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11
Q

The compressor housing is usually constructed of?

A

An aluminum alloy

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12
Q

What is proper shutdown procedure for a turbo?

A

3-5 min at 1/2 engine speed, 3-5 min at idle

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13
Q

Before you replace a damaged turbo you must?

A

Determine the reason of the failure

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14
Q

As the thrust washer and related components wear:

A

The axial end play will increase

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15
Q

Radial endplay must be checked on:

A

Both the turbine and compressor wheels

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16
Q

Before disconnecting anything for turbo removal you must?

A

Clean area around turbo help prevent and dirt or debris from entering

17
Q

What are two type of air coolers, and what cooling medium is used?

A

Intercoolers - Air

Aftercoolers - Coolant

18
Q

What is the function of the turbo wastegate?

A

Sense boost pressure and open bypass valve once a specified pressure is reached

19
Q

How does a VDT limit boost pressure?

A

Adjustable veins. Can be sliding or pivoting

20
Q

What are the two type of seals used to seal shaft to housing in turbo?

A

Wind back seals

Steel piston style sealing rings

21
Q

What is the purpose of aftercoolers and intercoolers?

A

Cool air down so that it becomes for dense