Evening star. [volume] (Washington, D.C.) 1854-1972, 1921-01-16

Apswerx to Last Weeks Questions.
L. There are two ways of locating
q cylinder which misfres regularly.
One way is to remove the spark
plug wire from one plug at time.
When cylinder is discovered the en-
CINE will run the same as though
the wire were connected. Another
way is to open the compression cock
of one cylinder at time and watch
the flame RAISING through the open
cock. The cylinder not firing Kill not
give forth a famo--only quick
kissing nos during eacn upward
stroke of til. piston.
>. To tell y hen valves of an auto
mobile engine open and close by the
position of the fywhee;. the inlet
valve should open when the ily%heei
has travelled from 10 to Is degrees
fro! top dead center of the piston.
abe ut A. degrees of flywheel travel
before the piston reaches end of pc
er stroke. or about seven-eighths of
power stroke. Inlet valves should
close between Is to 30 degrees Of fly
wheel travel after the piston starts
on compression stroke. The q haust
valve Should close when the fly" heel
has gone about 10 degrees after the
piston finishes exhaust stroke.
3. Gasoline is obtained from crude
petroleum. When, first put on the
market it sold as low AS 1 cents per
gallon-before automobiles used it.
4. Usually there are two circuits
in an ignition system. primary and
secondary circuits. More than one
circuit can flow through a wire at the
ondary or high-tensiou current and
primary or low-tension current both
flow through the same certain wires
in the ignition system
5. To find out IL the oil conta ms
acid, dissolve small amount of the
oil in alcohol and by holding tube
which contains the mixture in warm
water. which will aid dissolving. test
by immersing litmus paper. The
usual blue litmus paper will turn red
if there is any acid in the oil.
6. Air and water taken in same
amount of heat in a given time. Air
will not absorb heat as quickly as
water.
7. Brakes must be so adjusted that
with moderate pressure on the foot
pedal they will stop the car but will
not lock the wheels. but should oper-
ate SO that with additional pressure
, they will grip sufficiently to lock the
wheels when required. Brakes which
act too quickly will cause premature
wear of the rear tires. and if they
are not quick enough of action the
car and its passengers will be in
danger whenever the brakes are
! called upon to stop the car Great
pressure should not be necessary to
operate them efficiently.
8. Judgment should be used in the
operation Of the spark control. and
/ it's positionson the steering wheel
should be according to engine speed
and engine load. When a car is
travelling a smooth level road the
spark control should be advanced as
fully as the speed of the engine re-
quires, but when the engine is labor
ing through mud. ruts or other poor
roads, the natural position of the
spark lever should be in retard, as
the car very seldom affairs any but
| a very slow speed
9. The trouble which will cause {
noticeable lack of power while az
engine is pulling a car and yet which
will allow the engine to run fairl.
well while idling. is usually lost com
preston due to poorly seating valves
leaking rings, cylinder out of round
or other compression troubles. poo