190203c Flashcards

0
Q

All diesel fuel injection systems must perform what five functions ?

A
  1. Timing - inject the fuel at the correct time.
  2. Rate - inject the fuel at the correct rate.
  3. Atomization - atomize the fuel for proper combustion.
  4. Metering - meter the fuel to meet the needs of the engine.
  5. Penetration - inject the fuel at pressure high enough to penetrate the combustion chamber
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1
Q

The two common types of diesel fuel injection systems are ?

A

Multi-plunger injection pump system and unit-type injector fuel system

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2
Q

Optimum crank angle is usually between ?

A

20 degrees to 25 degrees after top dead centre ( ATDC )

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3
Q

Beginning of injection ( BOI ) occurs how many degrees before top dead centre ( BTDC )

A

Seven degrees

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4
Q

Timing that occurs after manufactures specifications is said to be ?

A

Retarded ( late)

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5
Q

Timing that occurs before manufacturers specifications is said to be ?

A

Advanced ( early )

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