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.

Whatever carburetor is used on a
car, there can be practically the same
act of rules followed in making the
adjustments for its proper operations.
In every case the oarburetor should
be adjusted and tried under three
different conditions OF running-first
idle and at low speed, then without
any load. but at high speed, and at
ehst aecalerating on the road, says The
Motor Print
started and the needle valve of the
uarburetor closed as far as possible,
giving it. then. one or two turns in
the direction of the opening. Now
Che throttle should be rapidly opened
and closed, with the sparks at differ
ent settings, and IL black smoke
exits from the muffler at any time.
NE valve should be screwed down,
whereas If the motor backfires, addi
fonal fuel should be permitted to
pass the Jet.
II backfires occur. 4 is the sign of a
bean mixture, and ifNhe 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
the valve open under less suction.
Even II there is no black smoke, how
ever, the mixture may be TOO rich, and
II is wise to close down on the needle
valve until backfiring begins; then
turn back the needle until II disap-
pears.
Throttle Down Motor.
Now the throttle should be turned
- low as possible with the motor
running. The proper point having
been determined, the throttle-stop
should be so screwed down as to pre-
vent further closing when the car
stands idling in the street. Then the
motor should be speeded, and If back
firing occurs, the air valves must be
closed slightly. to cause the backfiring
20 stop. Thus the motor should be
tried several times at high and low
speed until satisfactory.
The final or accelerating test con-
etsts in taking the car on a billy road
and pressing the pedal after slow
start II the carburetor chokes or
the Rotor begins TO fire irregularly,
the mixture may be TOO rich OF the
carburetor design bad. In some cases
9l behavior is due only to too sudden
q pressing of the accelerator, and
then the pedal must be pressed grad
ually.
If. however, the motor operates all
right at high speed, and fires irregu-
5arly at low ones, the trouble is with
the spark plugs, which have too large
gap between the electrodes.
You often hear complaints about the
difficulty of starting certain engines
with the magnetic ignition In use. yet
II is noticed and remarked upon that
Immediately the supplementary igni-
tien-usually taking the form of an
accumulator coll SYSTEMS switched
on the engine starts after the first or
second pull over of the starting han
Ole
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 1t
should be easier to start with the ac-
cumulator coil system, but the diff
Guilty in starting with the other sys-
tenn is not necessarily caused by any
want of adjustment IN the magnetic |
AS matter of fact, when the engine |
Is turned over slowly by hand, a mag |
neko. As a matter OF fact, when the |
engine is turned over slowly by hand |
q magnetic win not provide 30 good a |
spark as battery systems under sim
Star circumstances, and, consequent |
~, IL a 0arburetor be so adjusted MS |
to provide a weak mixture at start |
ing the spark given by the magnetic |
is not of sufficient intensity to ignite |
xhe charge drawn IN A similarly |
weak mixture would, however, be ig- !
lifted by the battery system.
The point, therefore, is that when |
dif1lcuffy is experienced in starting
with the magnetic only the carburetor |
ehould be examined and adjusted so |
as 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, while II win be a distinct
advantage under the other condition.
II no means is provided for giving a
rich starting mixture. a simple plan
may be adopted 30 that this can be
obtained when required without lift
tng the bonnet. It Is an easy matter
10 arrange a slide. something after the
type of a magic lantern slide. at tho
end of the main air intake This can
be coupled up directly In most cases
10 length of sis inch steel rod.
which can be carried forward and
proiett under the radiator so that IL
may be manipulated from the front of
bhe car when the engine Is being
started.
BY closing this slide. or partially
closing IL, 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
in any case, for although as general
rule many engines may start without
difficulty on the magnetic. yet to all
these a day may come when some
Temporary arrangement partial
blockage of the Jet. for instance-win
render an adjustable. air inlet. ma
nipulated from a convenient position,