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Engines > Fuel Injection > Flashcards

Fuel Injection Flashcards

1
Q

What are the differences between direct and indirect fuel injection

A

Direct - less economical, more powerful, starts unaided, lumpy

Indirect - more economical, cleaner exhaust, cold start assisted, smooth

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2
Q

Why sort of pressure is in a diesel injector?

A

200+ bar

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3
Q

What are the 3 types of heater plugs?

A

External, internal and micro nova

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4
Q

In a basic diesel fuel system what are the main components?

A 
Fuel tank 
Fuel lift pump 
Filter 
Sedementor 
Injection pump 
Injectors
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5
Q

What controls engine speed?

A

A governor

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6
Q

In the fuel system what dose the low pressure side do?

A

Cleans the fuel and delivers to high pressure side

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7
Q

What dose a governor do?

A

Control how much fuel goes from injection pump to the injectors

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8
Q

What are the types of nozzle on an injector?

A

Single Hole
Multi hole
Pintle

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9
Q

With injectors. The hole type, the multi hole type.

How many whole are there and what size?

A

Up to 12 holes starting at 0.2mm

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10
Q

What dose white smoke mean?

A

Incorrect fuel pump timing
Leaking cylinder head gasket
Poor compression

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11
Q

What dose blue smoke mean?

A

Lubricating oil is being burnt

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12
Q

What can cause good combustion ?

A

Squish and swirl of the fuel

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13
Q

What pressure is a indirect injection?

A

100 to 150 bar

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14
Q

What does the fuel pump do?

A

Convers the fuel to low pressure to high pressure,

Transfers the fuel to the injectors

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15
Q

What does a baffle do?

A

Allows no oxygen into the pick up, always submerged in fuel

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16
Q

What are 2 fuel lines used for?

A

To carry fuel to the injectors

To carry fuel back to the tank

17
Q

What are the 3 types of lift pumps?

A

Diaphragm
Plunger
Vein pump

18
Q

What acts on the rocker arm in a diaphragm fuel pump?

A

Eccentric cam

19
Q

What does a fuel filter do?

A

Removes any abrasive particles and water to reduce any damage to the engine

20
Q

What are the types of fuel filters

A

Sedimenter unit

Resin impregnated paper filter

21
Q

What’s aids cold starts?

A 
Coolant heaters
Oil heaters 
Battery warmers 
Glow plugs and intake heaters
Fluid starting aids
22
Q

What circuit do glow plugs operate on?

A

Parallel and series

23
Q

How does an injector work?

A

Pump pressure operates the nozzle against the injector spring, nozzle valve opens and closes many times rapidly each injection

24
Q

Where does pintle get commonly used ?

A

Indirect injection.

25
Q

What does black some indicate ?

A

Fuel is only being partially burnt
Restriction in air intake
Failure to atomise
Poor compression/valve timing

26
Q

What are the types of governors ?

A

Mechanical
Hydraulic
Pneumatic

Engines (10 decks)

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