SCORPION 1975 LIL' WHIP Wartungshandbuch PDF herunterladen (Seite 2)

SERVICE

MANUAL

-

1975

SCORPION

WHIP

ENGINE

SYSTEM

Functional

Description:

2

-C

YCLE

ENGINE FUNDAMENTALS

The

Rockwell

2-cycle

air

-

coo

l

ed

ga

s

oline

engine,

pa

rti

cu

larly

th

e

axial

fan

-

cooled

twin

cy

lin

der

en

gi

ne,

ha

s

become

v

er

y

popular

to

day

for

s

nowmobil

es.

It

is

uniquely

qualified

for

this

ap

-

plication

because

of

its

high

power

output,

li

g

ht

weight

and

ease

of

lubri

cat

io n,

with

few

e r

moving

part

s

than

other

conventional

2-cycl

e

and

4-cycle

e

ngin

es.

How

eve r,

in

order

to

get

the

best

possible

u

se

and

ensure

that

it

re

tain

s

it

s

high

degree

of

d

ependab

ility

and

e

nduranc

e,

it

must

receive

pr

oper

care

and

maintenance.

Th

erefo

re,

it

is

n

ecess

ary

for

us to

know

some

thing

about

the

basic

fundam

enta

ls

of

this

e

ngin

e

and

how

it

functions.

OPERATION

The

Rockwell

2-cycle

Twin

Cylind

er e

ngine

is

of

th

e

loop-s

c

av

e

nged

third

port

type,

the

most

widely

used

de

s

ign

today.

It

u

ses

a

mixtur

e

of

gasoline,

oil

and

air

for

combu

s

tion,

lubrication

and

cooling

.

It

fires

on

every

stroke

of

each

piston.

Th

ere

are

two

power

strokes

for

every

revolution

of

th

e

crankshaft.

A s

the

piston

moves

upward

in

th

e

cylinder

it

draws

the

fuel/air

mixture

into

the

crankcase

through

the

intake

manifo

ld

whi

le

at

the

same

time

compr

ess

ing

fu

e l

that

has

b

ee

n

forced

into

the

combustion

chamber.

See

Fig.

1-1

A.

As

the

piston

near

s

top

dead

center

the

spar

k C

IN

TAKE

EXH/

UST

plug

is

fired

and

the

compressed

fuel/air

mix-

'---

------

---'

ture

burns

and

expands

thereby

forcing

th

e

pi

s

ton

downward

on

a

power

stroke.

As

the

downward

stroke

of

the

piston

turn

s

th

e FIG. 1-1

crankshaft,

it

al

so s

tart

s

to

compress

th

e

fuel/air

mixture

in

the

crankcase

and,

simultaneously,

op

e

ns

th

e

exhaust

port

and

closes

the

intake

port.

See

Figs.

1-1

B &

C.

1·2

)

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