Clinton D65-1000 Owner's Manual - Page 2

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OPERATION
OF THE TWO CYCLE
ENGINE
ln
q
two
cycle engine, intoke, compression,
power
qnd
exhqust
ore
completed
in
two
strokes
of
the
piston.
A
power stroke
results
with
every
revolution
of
the cronkshoft. On
the upword stroke
of
the
piston,
o
portiol vocuum is
creoted
in
the
cronkcose.
(See
Figure
No. l)
First,
the vocuum ond outside
oir
pressure couse lhe
reed
volve
between
the cronkcqse ond the corburetor
to open.
The
qir-fuel mixture from the corburelor flows
in to the engine
cronkcose. Then,
the
downword
move-
ment
of
the
piston
couses
the
reed volve
to
close
while
continued
downword movement
of
the
piston
compresses
the
fuel
chorge
in the cronkcose. Neor
the
botlom
of
its
stroke
the
piston
uncovers
the
intoke
by-poss
port, which
connects
the combustion chomber
ond the
cronkcose.
As the piston
moves
upword
on
its stroke,
it
posses
the intoke port, closing the port opening. lts continued
upword
movement couses
the fuel
mixture
in
the
cylinder
to
be
compressed.
At
the
some
time
o
new
fuel
chorge
is
drown into the
cronkcose.
As
the
piston neors the
top
of
the
compression
stroke,
the
fuel
mixture
in the
combustion
chomber
is ignited
by
the
spork. The explosion
ond
exponsion
of
goses
forces
the
piston down
on its
power stroke.
Power
is not delivered
for the
full
length
of
the stroke.
Some
time is required
to rid
the cylinder
of
burned
goses,
so
thot
it
moy
receive
o
fresh fuel chorge from
lhe
cro
nkcose.
As the piston
neors
the boltom
of
its
stroke,
it
un-
covers
the exhoust port opening slightly qheod
of
the
intoke port. This permits toking odvontoge
of
the
pressure
of
the exhqust
goses
in the
cylinder, which
ore still
comporotively
high, ond ollows them
to
stort escoping. Further downword
trovel of the
piston
uncovers
the intoke by-poss port.
The
incoming chorge
ossists
in forcing the exhoust
gqses
out
of
the cylinder,
to
complete
the
cycle.
The
chief ottributes
of
the two
cycle
engine
ore
its
lightweight, low
cost
ond powerful but simple
opero-
tion. With only three bosic moving ports
(cronkshoft,
piston
ond rod),
mointenonce
costs
qre
ot o
minimum
while
efficiency
is ot
o
moximum.
COMPRESSION
POWER
EXHAUST
Figure
No.
I