Atlanta Georgian. [volume] (Atlanta, Ga.) 1912-1939, 1914-02-01
ADJUST YOUR
CARbURETOR BY
THIS METHOD
Practically Same Formula will
Answer for All Makes Of
Mixers.


oar. there can be practically the same
set OF rules followed in making the
adjustments for its proper operations.
IN every case the carburetor should
be adinsted and tried under three
different conditions of running-hrst
tile and at low speed, then without
any load, but at high speed, and at
fhet aeceierating on the road. says The
Motor Print
First OF all, the motor should be
started and the needle valve of the
nsxburetor closed as far as possible,
&tvfng It, then, one or two turns in
tho direction of the opening. Now
Che throttle should be rapidly opened
and closed, with the sparks at differ
Ont settings, and If black smoke
exfts from the muller at any time,
Ene valve should be screwed down,
whereas If the motor backf1res, addi-
t1onal fuel should be permitted to
pass the Jet.
II baokfires occur. it is the sign of a
bean mixture, and If the adjustments
on the carburetor in question are
made on the auxiliary air valve the
tension on the spring controlling the
latter should be reduced SO as to let
zhc valve open under less suction.
Even II there is no black smoke, how
ever. the mixture may be roo rich, and
a. fs wise to close down on the needle
valve until backhring begins; then
turn back the needle until 1t disap-
pears.
Throttle Down Motor.
Now the throttle should be turned
- low as possible with the motor
cunning. The proper point having
been determined, tho throttle-stop
should be so screwed down as TO pre-
vent further closing when the car
stands tdling in the street. Then the
motor should be speeded, and If back
airing occurs, the air valves must be
cIosed slightly, TO cause the backfiring
% stop. Thus the motor should be
tried several times at high and low
speed until satisfactory.
The final or acceleratfng test con-
9tsts IN taking the car on q hilly road
and pressing the pedal after. O slow
start II the carburetor chokes or
the motor begins to fire irregularly,
tho mixture may be roo rich or the
carburetor design bad. In some cases
fli behavior Is due only to too sudden
q pressing of the accelerator, and
then the pedal must be pressed grad
ually
II. however, the motor operates all
right at high speed, and fires irregu-
aarly at low ones, the trouble Is with
the spark plugs, which have too large
y gap between the electrodes.
You often hear complaints about the
difficulty of starting oertat, engines
with the magnetic ignition in use, yet
IL is noticed and remarked upon that
Immediately the supplementary igni-
tfon--usually taking the form of an
eccumuiator coil system-is switched
on the engine starts after tho first or
second pull over Of tho starting han
die.
Change the Mixture.
The difficult starting under the first
condition is immediately put down to
the magnetic, whereas this may not by
any means be the case, but may be
due to the carburetor. Admittedly II
should be easier to start with the ac-
cumuiator coil system, but the DIM
Guilty in starting with the other sys-
tenn Is not necessarily caused by any
TRnt OF adjustment m the magnetic.
As a matter OF fact, when the engine
10 turned over slowly by hand, q mag
neto. As q matter OF fact. when the
engine is turned over slowly by hand
. magneto win not provide 90 good a
|RpHrk as battery systems under SIM
1lar circumstances, and, consequent
~, X q carburetor be so adjusted as
20 provide a weak mixture at start
ing the spark given by the magnetic
IL not OF sufficient intensity to ignite
the charge drawn IN. A similarly
weak mixture would, however, be ig-
ptted by the battery system
The point, therefore, is that when
difficulty 10 experienced in starting
with the magnetic only the carburetor
should be examined and adjusted so
IS to provide a richer mixture when
the starting handle is pulled over.
THE richer starting mixture will be
NO detrfment when the battery sys-
tenn is used, white II win be distinct
advantage under the other condition.
II no means Is provided for giving a
rich starting mixture. a simple plan
may be adopted 20 that this can be
pbtatned when required, without lift
ting tho bonnet. II Is an easy matter
10 arrange a slide. something after the
type of a magic lantern slide, at the
end of the main air intake. This can
be coupled up directly In most cases
10 a length of S-16 inch steel rod,
which can be carried forward and
project under the radiator 50 that II
may be manipulated from the front of
the car when the engine Is being
started.
BY closing this slide, or partially
closing il, a mixture of any desired
richness can be obtained for starting
up. OF course, with cars having mag
neto ignition only some such means OF
cir adjustment Is distinctly advisable
sn any case, for although as a general
rule many engines may start withdpt
difficulty on the magnetic, yet to all
these a day may come when some
temporary arrangement partial
,Jlockage OF the Jet, for instance--will
render an adjustable air inlet, ma
nipulated from a convenient position,
n most acceptable acquisition.