Turbocharged Air Systems Flashcards
What is the basic reason for turbo charging and engine?
To increase the power output
The increased air pressure created by a turbo also tends to increase what?
the turbulence created in the cylinders
The compression ratio in a turbo charged engine is?
Lowered
What happens to injection timing in a turbo charged engine?
Timing is retarded
A turbo charged engine designed correctly can have a power output increase of?
50% or more
A turbocharger is often referred to as?
A centrifugal air pump
The major components of the turbo are?
Turbine wheel and housing
Compressor wheel and housing
Turbo’s can reach what speed?
Over 100,000 RPM
Another name for the compressor wheel is?
Impeller
The turbo shaft assembly spins on what type of bearing?
Full floating bearing
The compressor housing is usually constructed of?
An aluminum alloy
What is proper shutdown procedure for a turbo?
3-5 min at 1/2 engine speed, 3-5 min at idle
Before you replace a damaged turbo you must?
Determine the reason of the failure
As the thrust washer and related components wear:
The axial end play will increase
Radial endplay must be checked on:
Both the turbine and compressor wheels
Before disconnecting anything for turbo removal you must?
Clean area around turbo help prevent and dirt or debris from entering
What are two type of air coolers, and what cooling medium is used?
Intercoolers - Air
Aftercoolers - Coolant
What is the function of the turbo wastegate?
Sense boost pressure and open bypass valve once a specified pressure is reached
How does a VDT limit boost pressure?
Adjustable veins. Can be sliding or pivoting
What are the two type of seals used to seal shaft to housing in turbo?
Wind back seals
Steel piston style sealing rings
What is the purpose of aftercoolers and intercoolers?
Cool air down so that it becomes for dense
