CPT Ignition Systems & Timing

Question 1

What does ignition timing refer to in an internal combustion engine?

Accepted Answer

The moment the spark plug fires relative to piston position

Answer

The interval between fuel injection and combustion

Answer

The delay between throttle input and engine response

Answer

The time required for the engine to reach operating temperature

Question 2

What is the primary purpose of an ignition timing advance mechanism?

Accepted Answer

To allow combustion to complete optimally as engine speed increases

Answer

To increase fuel economy at idle

Answer

To reduce exhaust gas temperatures under load

Answer

To synchronize the fuel injectors with valve timing

Question 3

Which tool is used to dynamically measure ignition timing on a running engine?

Accepted Answer

Timing light (stroboscope)

Answer

Vacuum gauge

Answer

Multimeter

Answer

Compression tester

Question 4

What is engine knock (detonation) in relation to ignition timing?

Accepted Answer

Uncontrolled ignition of the air-fuel mixture before or simultaneously with the spark

Answer

Normal combustion noise at idle speed

Answer

Mechanical noise from loose valve train components

Answer

Fuel injector pulse noise heard under load

Question 5

What is the difference between static timing and dynamic timing?

Accepted Answer

Static timing is measured with the engine off; dynamic timing is measured with the engine running

Answer

Static timing applies to diesel engines; dynamic timing applies to gasoline engines

Answer

Static timing uses a timing light; dynamic timing uses a scan tool

Answer

Static timing is measured in milliseconds; dynamic timing is measured in degrees

Question 6

What is the primary function of a distributor cap in a conventional ignition system?

Accepted Answer

To regulate voltage to each spark plug in firing order sequence

Answer

To advance ignition timing based on engine load

Answer

To convert primary voltage to secondary high voltage

Answer

To control dwell angle for the ignition points

Question 7

What is a primary advantage of a distributorless ignition system (DIS) over a conventional distributor-based system?

Accepted Answer

DIS eliminates mechanical wear points and allows individual cylinder timing control

Answer

DIS systems require more frequent maintenance intervals

Answer

DIS systems use lower secondary voltage for improved safety

Answer

DIS requires a physical timing belt to synchronize spark delivery