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Engine Fundamentals, Service & Repair > Engine Fundamentals > Flashcards

Engine Fundamentals Flashcards

0
Q

Spark ignition

A

A timed spark is used to ignite fuel/air mixture

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1
Q

Compression Ignition

A

Fuel is injected into highly compressed air and the heat of compression ignites fuel

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2
Q

Bore

A

Diameter of a cylinder

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3
Q

Stroke

A

Distance piston moves from TDC to BTC

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4
Q

Piston displacement

A

Swept volume of a single cylinder

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5
Q

Engine displacement

A

Swept volume of all cylinders

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6
Q

Compression ratio

A

A comparison of volume above piston between BDC and TDC

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7
Q

Volumetric efficiency

A

A comparison between actual amount of air taken in during intake divided by actual cylinder volume

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8
Q

British Thermal Unit

BTU

A

Amount of heat required to raise temperature of one pound water one degree fahrenheit

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9
Q

Horsepower

A

Rate of doing work

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10
Q

Indicated horsepower
Frictional Horsepower
Brake Horsepower

A

Theoretical amount of horsepower without friction
Horsepower lost to friction
Useable horsepower at flywheel

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11
Q

2 methods of induction

A

Naturally aspirated- under atmospheric pressure

Supercharged- over atmospheric pressure

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12
Q

3 engine speed categories

A

Low speed - 1000 RPM or less
Medium speed - 1000 to 2500 RPM
High speed - 2500 to 3500 RPM

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13
Q

TDC

BDC

A

Top dead center

Bottom dead center

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14
Q

Scavenging

A

Removal of exhaust gases from the cylinder

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15
Q

Valve overlap

A

The number of degrees that the intake and exhaust valves are both open

16
Q

Effective power stroke

A

2 stroke - 90 to 95 degrees

4 stroke - 120 to 140 degrees

17
Q

Four events that make up one cycle of internal combustion engine

A

Intake
Compression
Power
Exhaust

Engine Fundamentals, Service & Repair (11 decks)

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