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engine front end construction > engine top end construction > Flashcards

engine top end construction Flashcards

1
Q

define bare cylinder head

A

its a complex metal casting with all of its parts removed

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2
Q

what is a bare cylinder head normally made out of

A

cast iron or alluminum

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3
Q

the construction of a clyinder head varies with engine —- and —-

A

deisgn and type

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4
Q

an —– valve guide is part of the cylinder head casting

A

integral

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5
Q

an —- valve guide is a seperate sleeve forced into a hole machined in the cylinder head

A

pressed in

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6
Q

name two types of valve seats

A

pressed in and integral

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7
Q

define valve seat angle

A

its an angle formed by the face of the seat

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8
Q

the most common valve seat angles are

A

45 degrees and 30 degrees

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9
Q

an —- angle is a 1/2-1 degree difference between the valve seat face angle and the angle of the valve face

A

interference

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10
Q

a diseal prechamber cup is pressed into the cylinder head and encloses the tips of the —- and —–

A

injector and glow plug

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11
Q

what is the function of an engines valve train

A

it controls the opening and closing of the cylinder head ports

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12
Q

automotive engines commonly use —- or —- valves

A

poppet and mushroom valves

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13
Q

define valve face angle

A

its the angle formed between the valve face and valve head

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14
Q

—- filled hollow stem valves are used when extra valve cooling action is needed

A

sodium

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15
Q

a stellite valve is often used in engines designed to burn —— fuel

A

unleaded

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16
Q

an —- valve seal is shaped like a cup and can be made of neoprene rubber or plastic

A

umbrella

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17
Q

an —- valve seal is a small round seal that fits into and extra groove cut in the valve stem

A

o-ring

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18
Q

a valve spring —– is normally used with an o-ring type of seal

A

shield

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19
Q

define valve spring tension

A

the stiffness of a valvenspring measured in pounds or kilograms

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20
Q

valve spring —- is the length of th valve srping when removed from the engine

A

length

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21
Q

define valve spring open length

A

its the springs length when installed on the engine with valve fully open

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22
Q

valve spring —- is the length of the valve spring when instaled on the engine with the valve closed

A

closed

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23
Q

valve — occurs when the valve fails to close entirely at high rpms because the spring is too weak

A

float

24
Q

a valve spring —- is a very thin, accuratly machined washer used to increase spring tension

A

shim

25
Q

what is the function of valve retainers and keepers

A

they lock the valve spring onto the valve

26
Q

a valve spring — is cup shaped washer installed between the cylinder head and the bottom of the valve spring

A

seat

27
Q

explain the purpose of valve rotators

A

turns the valve to prevent carbon buildup and hot spots in the valve face

28
Q

a valve —- helps prevent stem and rocker arm wear

A

stem cap

29
Q

what is the function of an engines camshaft

A

controls when the valves open and close

30
Q

cam lobe can be used to control —-

A

d- all the above

31
Q

cam shaft —- is the disntance the valves open

A

lift

32
Q

camshaft —- determines how long the valve stays open

A

duration

33
Q

define valve timing

A

refers to valve opening and closing in relation to the position of the pistons in the cylinders

34
Q

— is the time when both the intake and exhaust valves in the same cylinder are open

A

valve overlap

35
Q

describe the purpose of a camshaft thrust plate

A

its used to limit camshaft end play

36
Q

the camshaft journals ride in the cam —

A

bearings

37
Q

explain the term cam housing

A

its a casting that bolts to the top of the cylinder head to hhold the engine camshaft

38
Q

a cam cover serves the same purpose as a — cover on an overhead valve engine

A

valve rocker cover

39
Q

valve — ride on the camshaft lobes and transfer motion to the other parts of the valve train

A

lifters

40
Q

— lifters are common because they operate quietly by maintaining zero valve clearance

A

hydraulic valve

41
Q

— lifters are not self adjusting and require periodic adjustment

A

mechanical

42
Q

a roller lifter can be either mechanical or —

A

hydralic

43
Q

how is valve ckearance normally adjusted on engines equipped with OHC followers

A

either an adjusting screw in the follower or shims of different thicknesses can be used to adjust valve clearance

44
Q

—- are used in cam in block engines to transfer motion from the lifters to the rocker arms

A

push rods

45
Q

describe the function of rocker arms

A

they transfer valve train motion to the valve stem tips

46
Q

rocker arms are usually made of either — or —-

A

cast iron or steel

47
Q

—– rocker arms are used to change the valve train clearnace

A

adjustable

48
Q

one method of acheving variable valve timing uses an — that can rotate on the camshaft

A

camshaft gear

49
Q

another method of achieveing variable valve timing relies on eletro-hydrauliclly operated — and two different camshaft profiles for each valve

A

rocker arms

50
Q

an intake maifold holds the —- and has passages (runners) going to each cylinder head port

A

throttle body

51
Q

—- are internal passages formed in the intake manifold to carry either the air fuel mixture or air to the cylinder head ports

A

manifold runners

52
Q

define flame arrester

A

it prevents backfire damage to the air filter

53
Q

an — system has two sets of intake runners controlled by butterfly valves to aid engine efficiently and performance

A

variable induction

54
Q

describe the funtion of an exhaust manifold

A

routes burned exhaust gases from the cylinder head exhaust port to the echaust pipe

55
Q

a few high performance or sports car engines use lightweight , free flowing steel tubing exhaust manifolds called —-

A

headers

engine front end construction (4 decks)

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