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Flashcards in Internal Combustion Engines Deck (525)
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The back and forth motion of one or more pistons is transformed into the rotary motion of the crankshaft

Reciprocating engines

1

A diesel engine requires five supporting systems in order to operate

Air intake, exhaust, cooling, lubrication, and fuel injection

2

Diesel engines are not self speed limiting because the air entering the engine is

Always the maximum amount

3

Engine speed is limited solely by

The amount of fuel injected into the engine cylinders

4

Diesel engines require a _____ to control the amount of fuel being injected into the engine

Speed limiter (governor)

5

A diesel engine does not require ____

An ignition system

6

In a diesel engine, the fuel is injected into the cylinder as ____

The piston comes to the top of its compression stroke

7

When fuel is injected in a diesel engine, it vaporizes and ignites due to

The heat created by the compression of the air in the cylinder

8

Terms used to define the displacement of an engine

Bore and stroke

9

Displacement is measured in

Cubic inches or litres

10

Diametre of the engine's cylinders

Bore

11

The distance the piston travels from the top of the cylinder to the bottom

Stroke

12

Bore x stroke x number of cylinders equals

Displacement

13

Highest point of travel by the piston

Top dead center

14

Lowest point of travel by the piston

Bottom dead center

15

There are ____ degrees of crankshaft travel between TDC & BDC

180

16

All events that occur in the engine are related to

The location of the piston

17

For a diesel engine, power is rated in

Units of horsepower

18

The power transmitted to the pistons by the gas in the cylinders and is mathematically calculated

Indicated horsepower

19

Amount of useable power delivered by the engine to the crankshaft

Brake horsepower

20

Indicated horsepower can be as much as ___ higher than brake horsepower

15%

21

The difference between indicated and brake horsepower is due to

Internal engine friction, combustion inefficiencies, and parasitic losses

22

Ratio of an engine's brake HP and its indicated HP

Mechanical efficiency

23

Mechanical efficiency of a four cycle diesel

About 82 - 90 percent

24

Measure of an engine's ability to apply the power it is generating

Torque

25

Torque is commonly given in units of

Foot pounds

26

1 HP = _____ ft-lbs/min or ____ ft-lbs/sec

33000
550

27

Amount of compression

Compression ratio

28

Amount of space within the cylinder when the cylinder is at BDC as compared to the amount of space within the cylinder when the piston is at TDC

Compression ratio

29

Gasoline engine compression ratios range from

8:1 to 12:1