The Brookings register. [volume] (Brookings, Brookings County, S.D.) 1903-1971, 1916-09-07

70 STARK q car IN nrSt Speeoy tnon pro-
sress to intermediate, and then in q
few moments 90 into high. But re-
Gently in studying a book N autonno-
biles | find that il says that with q Sc
lective type Of gear box it is not nee
essary in changing from low to high
to pass through intermediate speed.
Does this mean that one may start a
car in any desired speed without in
jury to the engine and gears, providing
the proper care is used in allowing the
clutch to slip into engagement
No doubt what the author meant TO
make clear is that while 1t Is advisable
in shifting gears to go progressively
from one to the next 1t Is not neces-
sary to do so. For instance. If a car
was In the lowest speed with a selec-
tive gear set the step to the highest
speed could be made without ever hav-
ing the intermediate gear in mesh.
With the progressive gear, as the name
suggests. the gears are moved through
the intermediate when going from low
to high. With either type Of gear set.
however. the acceleration Of the car
should proceed smoothly from the time
Of starting until the high gear is in
mesh. Ii Is not proper after driving to
jump intermediate speeds unless under
extraordinary circumstances. One set
of conditions wherein It would be pos.
sible and perfectly proper to go from
low speed into high is in descending a
steep grade. On a very steep grade
one can start directly in high gear
without doing any harm.
What Is tho difference between a low
and a high tension magnetic?
The difference between the low and
high tension magnetos Is that In the
low tension there is only n primary
winding where low tension current is
generated, while In the high tension
magnetic there Is also included II sec
ondary coil in which n high tension
current is induced, due to the inter
ruption of the primary circuit.
Should all starter and motor arma-
lures have AZ air space around them
and not touch as the armature in the
magnetic?
Magnetic armatures do not touch any
thing. Neither do those of motors or
generators. They could not operate If
they did.
How does the low tension type OF
magnetic differ from the high tension
type, and which one is the best type to
use?
The high tension magnetic differs
from the low tension in that 1t carries
its transformer coil in a unit, whereas
the low tension has the transformer
coil separate. Where magnetos are EN-
ployed for automobile ignition either
the high tension or low tension will
give perfect satisfaction. although the
high tension Is more compact.
The two front cylinders in my car
will run for days and weeks without
causing any trouble and then, without
apparent cause, will cease firing, the
cylinders flood with gasoline and the
motor will heat up. On these occa-
sions the plugs give good sparks every
revolution. What do you think is the
trouble, it's cause and remedy?
The trouble with your two front cyl.
inders seems to be sticking valves.
The fact that you state that the motor
overheats at the time would lead to
the belief that this Is a cause and not
an effect. Probably the motor starts
to become o~verheated. causing the
valves to stick, which In turn gives
rico tn ppfcjro Nn, ehn,1I lnn1y norn
fully to see that the valve stems have
proper clearance, that they are not
bent and that the cooling system is
clean and in good order. The latter
can be aided by flushing out with a
saturated solution Of common soda.
Would there be any advantage in set
ting the timing gear on the magnetic
shaft one tooth or two teeth ahead2
Would il taxi up the wear or play
caused by two years of running?
The advancing of the magnetic gear
n or two teeth would not take up
back lash caused by wear, but would
compensate for lag in the electrical
system at high speeds.
Can you tell me the proper clearance
between the valve stem and valve stem
guides on a T-head motor and whether
or not the clearance on the exhaust
and intake side should be the same7
The amount Of clearance between
your valve stems and valve guides will
depend upon how eficacious the cool,
ing system Is. A car which Is amply
cooled requires less clearance in parts
likely to expand than one which is In
adequately cooled. A clearance of
0.OO4 inch will not be too much where
the parts are subjected to high tenn
peratures. 1t might be best to try o
clearance of 0.O02 inch and gradually
enlarge it if necessary by tapping In
the valve stems.
What 10 the cause Of q grabbing
clutch?
The grabbing clutch is due to INSULT
cient play in the clutch leather expand
ers, which bring the leather put against
the inner rim Of the flywheel when the
clutch Is engaged. The difficulty can
hn aocfIv ornconvpn ~ ~~c>~- -.--L