Generac Power Systems GTV99O User Manual

+CYCLE
ENGINE
THEORY
ftheengine isto
run
properly,
four
(4)
events rnustoccur in
the
proper
sequence and a!the corect time. These
events are
(a)
intake,
(b)
compression,
(c)
ignition
and
power,
and
(d)
exhaust.
A INTAKE
The
piston
is travellinq from top dead center
(IDC)
to bottom
dead center(BDC).
The
cam
has
opened the intake valve. The
piston
s
downward movementin the
cylindercreatesa
partial
vacuurn in the cylinder Air at atmosphefic
pressure
is drawn
into the cylinderthrough the carburetor and is mixed with fuel
in the ca lburetor. The fuel air mixturc flows
thrcugh the open
intake valve into the cylinder When the
piston
reaches BDC,
the intake stoke is over.
C rcNrT|oN
AND
powER
By
the time the
piston
reaches TDC
,
combustion is akeady
in
progress.
The intake and exhaustvalves remain
closed as the
exprnding
gases
of combustion
force
the
piston
downwad.
D
EXHAUsr
The exhauststroke
beginswhen the
piston
has
rcached BDC
and
has
started its upward movement. The intake
valve is
closed. The exhaunva ve is
open to let
gases
escape.
B
coMPREsstoN
As
the
piston
reaches
bottom de6d
center
(BDC),
both the
intake
and exhaustvalves
are closed. The
piston
moves upward
toward
TDC and
thefuel-air mixture is
compressed.lust before
the
piston
rcaches TDC, ignition
occLirs.

Generac Power Systems GTV99O Specifications

General

Brand	Generac Power Systems
Model	GTV99O
Category	Engine
Language	English