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automotive (level 1) > Engine Fundamentals > Flashcards

Engine Fundamentals Flashcards

1
Q

What is Cylinder displacement?

A

Volume of cylinder at top dead center and volume at bottom dead center.

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2
Q

What is compression ratio?

A

How much air/fuel misture will be compressed at TDC vs BDC.

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3
Q

What is ‘Work’ ?

A

When force moves mass a specific distance.

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4
Q

What is gear ratio?

A

Driving Gear over Driven Gear

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5
Q

What is Horsepower?

A

The rate of which Torque is Produced

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6
Q

Who first calculated Horsepower?

A

James Watt.

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7
Q

What is the Atkinson Cycle?

A

It delays intake valve open to let mixture escape back into intake manifold.

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8
Q

What are Intake Valves made up of?

A

Chrome, Nickle or Tungsten Steel.

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9
Q

What are Exhaust Valves made up of?

A

Nichrome, Silicon-chromiun or Cobalt chromium Alloys.

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10
Q

What does OHC mean?

A

Overhead Camshaft Engine.

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11
Q

What are Main Caps?

A

They hold the main crankshaft bearings in place.

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12
Q

What are the Piston Strokes in a 4-Stroke Engine?

A

Intake, Compression, Power and Exhaust.

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13
Q

What is leakage past the piston rings called?

A

Blowby.

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14
Q

What is Bearing Spread?

A

The parting face is slightly larger then the bearing bore.

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15
Q

What is the best way to describe piston slap noise?

A

A Hollow Bell like noise.

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16
Q

What test can be done to pinpoint the cause of a low cylinder compression?

A

Cylinder Leakage test.

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17
Q

What is Piston slap?

A

Noise made by the piston when it contacts the cylinder wall.

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18
Q

During a cylinder leakage test, where would you hear air if the Intake Valve is leaking?

A

Throttle Plate.

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19
Q

During a cylinder leakage test, where would you hear air if the Piston Rings were worn?

A

The oil fill port or dipstick tube.

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20
Q

During a cylinder leakage test, where would you hear air if the Exhaust valve was leaking?

A

Exhaust Pipe.

21
Q

During a cylinder leakage test, where would you hear air if the Head Gasket was blown?

A

Radiator.

22
Q

The Stroke of the Piston equal to ___ the Crankshaft Throw.

A

2x

23
Q

What is Thermal Efficiency?

A

How much of the heat formed during the combustion process is available as power from the engine.

24
Q

As an engine compression ratio increases, what should happen to the octane rating of the gasoline?

A

It should increase (to avoid detonation).

25
Q

What Engine type has the highest compression ratio?

A

Diesel Engine.

26
Q

What engine component is responsible for closing the intake and exhaust valves?

A

springs

27
Q

What is Tappet Noise?

A

Noisy Valvetrain Components.

28
Q

How many degrees of crankshaft rotation are required to complete a four-stroke cycle in one cylinder?

A

720

29
Q

Which V-type engine valve train design may use four camshafts?

A

DOHC

30
Q

SOHC V-8 engine has how many camshafts?

A

2

31
Q

When removing a cylinder head, which order should the bolts/nuts be loosened?

A

In the reverse order of assembly.

32
Q

what is the max allowable warpage on a V6 head?

A

0.003 inches.

33
Q

what is the max allowable warpage on a V8 head?

A

0.004 inches.

34
Q

what is the max allowable warpage on a I6 head?

A

0.006 inches.

35
Q

A free wheeling overhead camshaft engine is a _____________?

A

non-interference engine.

36
Q

What are Integral valve guides are reconditioned by?

A

Installing Bronze guide liners or by
Reaming the guide (for an oversize valve stem).

37
Q

What is the typical interference angle used in gasoline engines?

A

1 degree.

38
Q

Multiple valve springs (dual springs) generally have both coils in what direction?

A

Wound in opposite directions.

39
Q

When should a valve be discarded?

A

When it has damaged keeper grooves, is cracked or bent.

40
Q

What is the cause for blue smoke that occurs after starting the engine?

A

worn valve seals or guides.

41
Q

Where should the piston be when a Cylinder Leakage Test is done?

A

Bottom Dead Centre on Exhaust Stroke.

42
Q

What 3 things should Valve Springs be checked for?

A

Tension, free height and squareness.

43
Q

Which Valve is larger?

A

Intake Valve.

44
Q

What Engine type does not have Pistons?

A

Rotary.

45
Q

Engine Displacement is measured in ________ .

A

CC or Liters.

46
Q

What is the Maximum Valve margin clearance?

A

1/32 of an inch.

47
Q

How much pressure does a Cylinder need to hold?

A

1000-1500psi

48
Q

What is the Formula for calculating displacement?

A

pie r2 (half the bore) X stroke X # of cylinders

automotive (level 1) (9 decks)

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