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myagk > P Piston Engine Principals > Flashcards

P Piston Engine Principals Flashcards

1
Q

Equation for power

A

Power = torque x rpm

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2
Q

Equation for torque

A

Torque = force x distance

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3
Q

Equation for force

A

Force = pressure x area

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4
Q

What are the stages of a 4 stroke cycle?

A
  • Induction
  • Compression
  • Power
  • Exhaust
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5
Q

What energy is present in the induction stage?

A

Chemical energy

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6
Q

What energy is present in the compression stage?

A

Heat energy

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7
Q

What energy is present in the power stage?

A

Pressure energy

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8
Q

What energy is present in the exhaust stage?

A

Mechanical energy

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9
Q

What is the position of the piston at the top of the cylinder?

A

Top dead centre (TDC)

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10
Q

What is the position of the piston at the bottom of the cylinder?

A

Bottom dead centre (BDC)

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11
Q

What is the name for the distance between TDC and BDC?

A

Stroke

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12
Q

What happens in the induction stroke?

A

Piston moves downwards sucking in charge mixture

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13
Q

What happens in the compression stroke?

A

Charge is compressed, pressure and temperature is increased

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14
Q

What happens in the power stroke?

A

Charge is ignited, pushes the piston back down

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15
Q

What happens in the exhaust stroke?

A

Exhaust valve opens and exhaust air is pushed out of the cylinder

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16
Q

What is the ineffective crank angle?

A

Where there is small linear movement of the piston for a large angular rotation of the crankshaft

17
Q

What is inlet valve lead?

A

When the inlet valve is opened early, at the end of the exhaust stroke

18
Q

What is exhaust valve lead?

A

The exhaust valve opens before the end of the power stroke

19
Q

What is exhaust valve lag?

A

The exhaust valve remains open after TDC an into the induction stroke

20
Q

What is valve overlap?

A

When both valves are open at the same time

21
Q

What is the ignition timing?

A

Ignite just before TDC so the whole charge has ignited by just after TDC

myagk (37 decks)

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