Deck 8: Fuel and Engine Management Systems

Question 1

What are the two basic designs of variable venturi carburetors and how do they differ?

Answer 1

The two basic designs of variable venturi carbs are the mechanical slide and constant velocity carburetors. The rider lifts the slide in a mechanical slide design while engine vacuum lifts the slide in a CV type carb when the rider opens the butterfly.

Question 2

A(n)____ shuts off air to the idle circuit to prevent backfiring.

A)enrichner
B)accelerator pump
C)float valve
D)air cut valve

Answer 2

D

Question 3

What is a throttle by wire system?

Answer 3

A throttle by wire system replaces a physical cable from the throttle to the butterfly valve with an electronic sensor, wiring and other sensors that reads the degree of throttle opening that the rider has chosen and then allows the air to enter the engine.

Question 4

Define atomization. When does it take place in a carburetor?

Question 5

Where are the bypass ports located in a mechanical slide carburetor and what is their function?

Question 6

Describe what an engine management system does.

Question 7

A(n)____ is used to assist starting a cold engine.

A)enrichner
B)accelerator pump
C)float valve
D)air cut valve

Question 8

There are three types of fuel pumps - mechanical, vacuum and _______________.

A)oscillating
B)reciprocating
C)electric
D)static

Question 9

A(n)_____ is used to temporarily enrich the fuel mixture during transition from carburetor phase to the next.

A)enrichner
B)accelerator pump
C)float valve
D)air cut valve

Question 10

What does the venturi principle state and how does it apply to a carburetor operation?

Question 11

Higher octane fuel will make any engine produce more power.

Question 12

Some petcocks will not flow fuel until a vacuum is applied to them.

Question 13

What is the purpose of the slide cutaway?

Question 14

A gauze air filter must be oiled to work properly.

Question 15

High altitude discourages detonation.

Question 16

The mid-range phase of carburetor operation is used when the slide is _____ open.

A)0 - 1/8
B)1/4 - 3/4
C)3/4 - full
D)1/4 - full

Question 17

The most common kind of air filter is made from foam.