Induction

Question 1

What is the primary fuel metering source in the induction system?

Answer 1

The volume of air flowing throughout the induction system. (THROTTLE)

Question 2

the amount of fuel provided to each cylinder is a function of one of what three positions?

Answer 2

RPM
Throttle
Mixture

Question 3

What are the parts to a float type carb?

Answer 3

Fuel IN 
Accelerator Pump
Mixture
Air Flow
needle 
Venturi
Throttle Valve
Fuel/Air Mixture into the Cylinder

Question 4

What does the accelerator pump do?

Answer 4

Accelerator pump squirts fuel into carburetor throat so if throttle is quickly put in, it won’t be fuel starved.

Question 5

What are the three float carb speeds?

Answer 5

Idling Speed: Throat Valve Closed
Medium Speed: Throat Valve Slightly Open
Full Speed: Throat Valve Full Open

Question 6

What pilot controls and gauges do you have for controlling the induction system?

Answer 6

Throttle
Mixture
Carb Heat Control

Question 7

What is the carburetor needle valve

Answer 7

Mixture Idle Valve regulates flow from the carburetor float bowl.

Question 8

What are the two forms of cooling in the carburetor ?

Answer 8

Air Expansion

Fuel vaporization

Question 9

Should you use carb heat only partially?

Answer 9

NO! partial carb heat may raise the carb temp to a more critical range and create ice. Use FULL or none at all.

Question 10

What is the basic premise of the fuel injection system?

Answer 10

Fuel and Air are mixed at each cylinder rather than out in the carburetor.

Question 11

Advantages to Fuel Injection

Answer 11

Better Fuel Distribution
Faster Throttle Response
Precise control of mixture
Less susceptibility to icing

Question 12

Disadvantages:

Answer 12

Difficult starting with hot engine
Vapor Lock
Clogged Injectors

Question 13

INDUCTION REVIEW ( EXAM )

What are the benefits to fuel injection?
What is vapor lock?
When you prime with the mixture closed what happens?
What is the Fuel/Air Ratio for ignition?

Answer 13

1. Better Fuel Distribution
   Faster Throttle Response
   Precise control of mixture
   Less susceptibility to icing
2. When engine is shut down and it’s a hot day, the fuel at the top could vaporize creating a “vapor lock”. Since the fuel pump can’t pump vapor, it gets trapped and the mechanical fuel pump has to be used to combat it.
3. NOTHING, no fuel means no prime.
4. 15:1