190203c Flashcards
0
Q
All diesel fuel injection systems must perform what five functions ?
A
- Timing - inject the fuel at the correct time.
- Rate - inject the fuel at the correct rate.
- Atomization - atomize the fuel for proper combustion.
- Metering - meter the fuel to meet the needs of the engine.
- Penetration - inject the fuel at pressure high enough to penetrate the combustion chamber
1
Q
The two common types of diesel fuel injection systems are ?
A
Multi-plunger injection pump system and unit-type injector fuel system
2
Q
Optimum crank angle is usually between ?
A
20 degrees to 25 degrees after top dead centre ( ATDC )
3
Q
Beginning of injection ( BOI ) occurs how many degrees before top dead centre ( BTDC )
A
Seven degrees
4
Q
Timing that occurs after manufactures specifications is said to be ?
A
Retarded ( late)
5
Q
Timing that occurs before manufacturers specifications is said to be ?
A
Advanced ( early )