Turbo Charging

Question 1

Manifold Pressure:

Decreases at ________ inch per ______ ft.

The engine’s Rated horsepower in an un-booted engine is only available at __________

___% performance is lost per ________ ft.

Answer 1

Decreases at 1 inch per 1000 ft.

Seal Level

3 % horsepower is lost per 1000 ft.

Question 2

EXAM QUESTIONS:

1. How much would you expect MP to decrease?
2. With full boost waste gate is? (OPEN/CLOSED)
3. What is critical altitude?

Answer 2

1. 1 in per 1000 ft.
2. FULL CLOSED
3. Altitude with waste gate closed where you’re unable to maintain manifold pressure

Question 3

2 Kinds of Turbo Engines:

Answer 3

Turbo Charger: Driven by exhaust gases in the engine

Super Charger: Mechanically driven by the engine through gears or belts.

Question 4

What kinds of Turbo Charged Engines are there and describe them.

Answer 4

Ground Boosted Engine:
Can be boosted well over 30” of MP. Normal range is 38-43.

Altitude Engine:
Engine where turbo charger is only used at altitude

Typically limited to 30”MP
Compression varied by the Waste Gate
Engine does nto have to endure internal stresses any greater than a normally aspirated engine.

Question 5

What are the components of an Altitude Turbo Charged Engine:

Answer 5

Turbine
Compressor
Waste Gate (controls boost pressure by regulating exhaust gases that drive compressor turbine.)

Intercooler

Question 6

Types of Waste Gates: (3)

Answer 6

Fixed : No Extra Controls (simple, allows only fixed amount of boost)

Manual Controlled Waste Gates : Uses a control to maintain MP. Remember to open waste gate on descent.

Automatically Controlled (Bootstrapping titrates to keep peak performance. Adjusts waste gate automatically to maintian MP. Requires SMOOTH application of power to prevent over boosting.