El Paso herald. (El Paso, Tex.) 1901-1931, 1913-08-09

housing itself is out of line This
should be determined first before
attempting to repair and install other
parts Would suggest that a careful
inspection of the axle housing itself
be made as well as the inner parts.
x x
Motoring Department The Herald
My car having separate battery and
magnetic plugs I reversed the termi-
nails and find engine appears to knock
with a muffled pOunO in the cutOut.
Upon reversing terminals this pound
ceases Kindly explain the reason for
this.-H J. H
There is no reason why the motor
should pound simply because you
change over the plugs. Care should be
taken that you change over terminals
Of the plugs in each cylinder only.
If you interchange the terminals be-
tween two cylinders the order of fir
ing would be deranged and, OF course,
the motor would pound. Some motors
having two spark plugs in each cylin-
der use one plug over the cylinder
head and the other in the valve cap.
Usually the plug in the cylinder head
has a much longer shank than that
in the valve cap
If the plugs should be changed
around by mistake the valve in lift
ing would hit the shank of the long
plug and cause a pound. 1t is also
possible that the noise you hear in the
muffler cut out is not a pound but
simply a difference in the sound OF
the exhaust This would be caused
by the difference in the intensity of
the spark at the plugs from the 6if-
ferent systems The battery and coil
system may be timed later than the
magnetic system. As a result the
exhaust would be louder from the
battery and coil ignition than il would
be from the magnetic ignition with the
spark lever in the same relative posi-
the plug the better the combustion OF
the charge and consequently the less
pressure at the exhaust The spark
generated by the magnetic is more in
coil system, hence the difference in
the sound Of the exhaust. This may
be misleading you. There is no reason
why the changing of the terminals
if the plugs are the same and the
timing OF the spark is the same in re-
lation to piston position
Motoring Department. The Herald
wish you would explain a few
things in regard to the magnetic on
my car. First is there a direct con-
nectiOn or Just a metallic connection.
TO each end of the winding armature
Of the magnetic? Or, in other words,
how is the primary circuit from the
magnetic led to the primary of the
coil and returned2 There are three
the coil box Two are green. con-
nected to the breaker box, and one
is yellow, connected to the magnetic.
just back of the breaker box I do
not see any ground wire for the re-
turn of the secondary circuit. I have
studied several diagrams from books,
which only seem to confuse me more
than ever. / will feel grateful If
you can make this clear to me-
Harry LandOW.
MagnetOs are constructed in differ
ent ways That is the current is
taken off the armature WindinSs in
different ways Usually by brushes
Not knowing the particular type of
magnetic you refer to. il is difficult
to explain in detail these points. The
primary current is led from the
armature through the breaker box to
the coil. The breaker box simply
serves as an interrupter of this cir
serves to make and break the circuit
The action of the vibrator is mag
netic, while the action of the circuit
breaker is mechanical The secondary
circuit is completed through the
primary circuit, the primary circuit /
being usually grounded through the
magnetic base What may confuse
you is the fact that the two currents
travel over the same wire at the same
time This is true, however, in that
the primary and secondary currents
differ in nature A direct current and
an alternating current can pass over
the same circuit without interference.
X
Motoring Department. The Herald
I have been told that it is a good plan
in going down steep hills to throw
your motor into second or first speed.
thereby making your motor hold back
the car instead of the brakes. Don't
you think this will injure the motors
E J. Berns.
The logical manner to control a car
is to disengaEe clutch and use the
brakes In descending exceptionally
steep grades where one is skeptical
about the efficiency of the brakes, /
then by using the first speed and OPEN |